Journal articles: 'Direct Metal Laser Sintering technology'

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Venkatesh, K. Vijay, and V. Vidyashree Nandini. "Direct Metal Laser Sintering: A Digitised Metal Casting Technology." Journal of Indian Prosthodontic Society 13, no. 4 (2013): 389–92. http://dx.doi.org/10.1007/s13191-013-0256-8.

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Jin, Yong Ping, and Ming Hu. "Direct Rapid Manufacturing Technology with Laser for Metal Parts." Advanced Materials Research 328-330 (September 2011): 520–23. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.520.

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Directly driven by CAD model, based on principle of discrete-superposition, rapid prototyping technology is the generic terms of rapid manufacturing 3-dimensional physical entities with any complex shape. One of its main development trends is direct rapid manufacturing for metal parts. Up to now, there are many methods utilizing laser beam containing selective laser melting, selective laser sintering and laser engineered net shaping. Research and development of these means for direct rapid metal manufacturing are presented in this paper. Digital direct rapid manufacturing for metal parts represents development direction of advanced manufacturing technology.

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Mierzejewska, Ż. A. "Process Optimization Variables for Direct Metal Laser Sintering." Advances in Materials Science 15, no. 4 (2015): 38–51. http://dx.doi.org/10.1515/adms-2015-0021.

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AbstractManufacturing is crucial to creation of wealth and provision of quality of life. Manufacturing covers numerous aspects from systems design and organization, technology and logistics, operational planning and control. The study of manufacturing technology is usually classified into conventional and non-conventional processes. As it is well known, the term "rapid prototyping" refers to a number of different but related technologies that can be used for building very complex physical models and prototype parts directly from 3D CAD model. Among these technologies are selective laser sintering (SLS) and direct metal laser sintering (DMLS). RP technologies can use wide range of materials which gives possibility for their application in different fields. RP has primary been developed for manufacturing industry in order to speed up the development of new products (prototypes, concept models, form, fit, and function testing, tooling patterns, final products - direct parts). Sintering is a term in the field of powder metallurgy and describes a process which takes place under a certain pressure and temperature over a period of time. During sintering particles of a powder material are bound together in a mold to a solid part. In selective laser sintering the crucial elements pressure and time are obsolete and the powder particles are only heated for a short period of time. SLS uses the fact that every physical system tends to achieve a condition of minimum energy. In the case of powder the partially melted particles aim to minimize their in comparison to a solid block of material enormous surface area through fusing their outer skins. Like all generative manufacturing processes laser sintering gains the geometrical information out of a 3D CAD model. This model is subdivided into slices or layers of a certain layer thickness. Following this is a revolving process which consists of three basic process steps: recoating, exposure, and lowering of the build platform until the part is finished completely.

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Sedlak, Josef, Oskar Zemčík, Martin Slaný, et al. "PRODUCTION OF PROTOTYPE PARTS USING DIRECT METAL LASER SINTERING TECHNOLOGY." Acta Polytechnica 55, no. 4 (2015): 260. http://dx.doi.org/10.14311/ap.2015.55.0260.

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Unconventional methods of modern materials preparation include additive technologies which involve the sintering of powders of different chemical composition, granularity, physical, chemical and other utility properties. The technology called Rapid Prototyping, which uses different technological principles of producing components, belongs to this type of material preparation. The Rapid Prototyping technology facilities use photopolymers, thermoplastics, specially treated paper or metal powders. The advantage is the direct production of metal parts from input data and the fact that there is no need for the production of special tools (moulds, press tools, etc.). Unused powder from sintering technologies is re-used for production 98% of the time, which means that the process is economical, as well as ecological.The present paper discusses the technology of Direct Metal Laser Sintering (DMLS), which falls into the group of additive technologies of Rapid Prototyping (RP). The major objective is a detailed description of DMLS, pointing out the benefits it offers and its application in practice. The practical part describes the production and provides an economic comparison of several prototype parts that were designed for testing in the automotive industry.

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Ujjal, Chatterjee, Kumar Roy Sumit, Kumari Monika, and Dutta Surupa. "Onlay restoration with direct metal laser sintering technology: A digital approach to prosthetic repair." Journal of Orofacial Rehabilitation 5, no. 1 (2025): 35–39. https://doi.org/10.5281/zenodo.15549359.

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Abstract Introduction: Full-mouth rehabilitation aims to restore function, aesthetics, and occlusion in patients with extensive dental wear, damage, or previous prosthetic failure. The selection of materials and techniques significantly influences the long-term success of the prosthesis. Case characteristics: A patient reported to the department with chief complaints of a fractured porcelain-fused-to-metal (PFM) bridge. After evaluating the dislodged prosthesis, an intraoral scan of the existing condition was performed. A digital workflow was utilized to design a new onlay restoration. A Direct Metal Laser Sintering (DMLS) metal framework was fabricated and tried in the patient's mouth, followed by PFM layering. The final prosthesis was cemented using resin cement and occlusion was carefully adjusted. Conclusion: The integration of digital dentistry and DMLS technology provides a precise and efficient approach to rehabilitate prosthetic failures. This case highlights the importance of digital scanning, CAD-CAM designing, and metal laser sintering in achieving optimal prosthetic outcomes.

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Żaba, K., S. Puchlerska, M. Kwiatkowski, et al. "Comparative Analysis of Properties and Microstructure of the Plastically Deformed Alloy Inconel®718, Manufactured by Plastic Working and Direct Metal Laser Sintering." Archives of Metallurgy and Materials 61, no. 1 (2016): 143–48. http://dx.doi.org/10.1515/amm-2016-0026.

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Nickel superalloys as Inconel® are materials widely used in the aerospace industry among others for diffusers, combustion chamber, shells of gas generators and other. In most cases, manufacturing process of those parts are used metal strips, produced by conventional plastic processing techniques, and thus by hot or cold rolling. An alternative technology allowing for manufacturing components for jet engines is the technique of 3D printing (additive manufacturing), and most of all Direct Metal Laser Sintering, which is one of the latest achievement in field of additive technologies. The paper presents a comparative analysis of the microstructure and mechanical properties of the alloy Inconel®718 manufactured by plastic working and Direct Metal Laser Sintering technology, in the initial state, after deformation and after heat treatment.

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Renn, Michael J., Matthew Schrandt, Jaxon Renn, and James Q. Feng. "Localized Laser Sintering of Metal Nanoparticle Inks Printed with Aerosol Jet® Technology for Flexible Electronics." Journal of Microelectronics and Electronic Packaging 14, no. 4 (2017): 132–39. http://dx.doi.org/10.4071/imaps.521797.

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Direct-write methods, such as the Aerosol Jet® technology, have enabled fabrication of flexible multifunctional 3-D devices by printing electronic circuits on thermoplastic and thermoset polymer materials. Conductive traces printed by additive manufacturing typically start in the form of liquid metal nanoparticle inks. To produce functional circuits, the printed metal nanoparticle ink material must be postprocessed to form conductive metal by sintering at elevated temperature. Metal nanoparticles are widely used in conductive inks because they can be sintered at relatively low temperatures compared with the melting temperature of bulk metal. This is desirable for fabricating circuits on low-cost plastic substrates. To minimize thermal damage to the plastics, while effectively sintering the metal nanoparticle inks, we describe a laser sintering process that generates a localized heat-affected zone (HAZ) when scanning over a printed feature. For sintering metal nanoparticles that are reactive to oxygen, an inert or reducing gas shroud is applied around the laser spot to shield the HAZ from ambient oxygen. With the shroud gas-shielded laser, oxygen-sensitive nanoparticles, such as those made of copper and nickel, can be successfully sintered in open air. With very short heating time and small HAZ, the localized peak sintering temperature can be substantially higher than that of damage threshold for the underlying substrate, for effective metallization of nanoparticle inks. Here, we demonstrate capabilities for producing conductive tracks of silver, copper, and copper–nickel alloys on flexible films as well as fabricating functional thermocouples and strain gauge sensors, with printed metal nanoparticle inks sintered by shroud-gas-shielded laser.

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Penchev, Preslav. "In Vitro Comparative Study of Different Technologies for Metal Denture Frameworks Fabrication - Direct Metal Laser Sintering, Machine Milling and Hybrid Technology." International Journal of Science and Research (IJSR) 10, no. 12 (2021): 868–73. https://doi.org/10.21275/sr211216062212.

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Kotila, Juha, Tatu Syvänen, Jouni Hänninen, Maria Latikka, and Olli Nyrhilä. "Direct Metal Laser Sintering – New Possibilities in Biomedical Part Manufacturing." Materials Science Forum 534-536 (January 2007): 461–64. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.461.

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Direct Metal Laser Sintering (DMLS) has been utilized for prototype manufacturing of functional metal components for years now. During this period the surface quality, mechanical properties, detail resolution and easiness of the process have been improved to the level suitable for direct production of complex metallic components for various applications. The paper will present the latest DMLS technology utilizing EOSINT M270 laser sintering machine and EOSTYLE support generation software for direct and rapid production of complex shaped metallic components for various purposes. The focus of the presentation will be in rapid manufacturing of customized biomedical implants and surgical devices of the latest stainless steel, titanium and cobalt-chromium-molybdenum alloys. In addition to biomedical applications, other application areas where complex metallic parts with stringent requirements are being needed will be presented.

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Humnabad, Prashant S., R. Tarun, and Indraneel Das. "An Overview Of Direct Metal Laser Sintering (DMLS) Technology For Metal 3D Printing." Journal of Mines, Metals and Fuels 70, no. 3A (2022): 127. http://dx.doi.org/10.18311/jmmf/2022/30681.

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Additive manufacturing is the process of building a component or a product layer-by-layer, as opposed to casting the component and then performing various subtractive machining processes like turning, drilling, milling which are the approach of subtractive manufacturing. The term 3D printing refers to the family of additive manufacturing processes, which utilize different mechanisms in order to build the product from a sliced computer aided design (CAD) model fed to the machine. direct metal laser sintering (DMLS) is the one method of 3D printing functional metal parts are suitable for engineering applications and has the potential to provide a viable alternative to conventional methods of manufacturing and produce superior quality components with great flexibility in design using a wide range of materials. This paper presents the overview of DMLS technology, process parameters, design considerations, case studies of parts manufactured by DMLS and its applications in metal casting and rapid tooling.

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Dmitriyev, T., and S. Manakov. "Digital Modeling Accuracy of Direct Metal Laser Sintering Process." Eurasian Chemico-Technological Journal 22, no. 2 (2020): 123. http://dx.doi.org/10.18321/ectj959.

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Products obtained by metal additive manufacturing have exceptional strength properties that can be compared with forged parts, and in some cases, even surpass them. Also, the cost and time of parts manufacture are reduced by two or even three times. Because of this, today’s leading corporations in the field of aerospace industry introducing this technology to its production. To avoid loss of funds and time, the processes of additive manufacturing should be predictable. Simufact Additive is specialized software for additive manufacturing process simulation is dedicated to solving critical issues with metal 3D printing, including significantly reducing distortion; minimize residual stress to avoid failures; optimize the build-up orientation and the support structures. It also enables us to compare simulated parts with the printed sample or measure it as a reference. In other words, the simulated deformations can be estimated concerning the reference geometry. The current work aims to study the deformation of the sample during the Direct Metal Laser Sintering (DMLS) process made from Maraging Steel MS1. Simufact Additive software was used to simulate the printing process. The main idea is to compare the results of the simulation and the real model. EOS M290 metal 3D printer was used to make a test specimen.

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Шашко, Ю. А., О. В. Кулик та А. Ф. Санін. "ВИКОРИСТАННЯ АДИТИВНИХ ТЕХНОЛОГІЙ ДЛЯ ОТРИМАННЯ ЗАГОТІВОК ДИСКІВ ТУРБІН ТУРБОНАСОСНИХ АГРЕГАТІВ". System design and analysis of aerospace technique characteristics 27, № 2 (2022): 169–76. http://dx.doi.org/10.15421/471937.

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This paper presents the results of research work, the main task of which was to assess the possibilities and prospects of using Direct Metal Laser Sintering - the technology of direct sintering of powder) DMLS for the manufacture of blanks for turbine turbine disk blades with blades (turbine rotor), as well as conducting analytical work to identify both advantages and disadvantages over other traditional methods.

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Jo, Jung-Hoe, and Min-Soo Park. "Fabrication of a Conductive Pattern on a Photo-Polymerized Structure Using Direct Laser Sintering." Applied Sciences 12, no. 21 (2022): 11003. http://dx.doi.org/10.3390/app122111003.

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Three-dimensional (3D)-printed electronic technology is considered to have great potential as it can be utilized to make electronic products with complex 3D shapes. In this study, based on a 3D printer with single UV laser equipment, we continuously performed photo-polymerization (PP) and selective metal powder sintering to fabricate a conductive pattern. For this, 3D structures were printed at a low energy using a 355 nm DPSS laser with a galvanometer scanner, which are widely used in PP-type 3D printing, and then the selective sintering of metal powders was performed with a high energy. In order to obtain a high-conductivity pattern by laser sintering, a circuit pattern that could actually be operated was fabricated by experimenting with various condition changes from mixing the metal composite resin to the laser process. As a result, it was found that the optimal result was to irradiate a 0.8 W UV laser with a beam spot size of 50 µm to 50 vol% aluminum composite resin. At this time, an optimal conductive pattern with a resistance of 0.33 Ω∙cm−1 was obtained by setting the pulse repetition rate, scan path interval, and scanning speed to 90 kHz, 10 μm, and 50 mm/s, respectively. This suggested process may be of great help in the manufacturing of practical 3D sensors or functional products in the future.

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Dolinsek, Slavko. "Direct Metal Laser Sintering Some Improvements of the Materials and Process." Materials Science Forum 539-543 (March 2007): 2681–86. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.2681.

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For a comprehensive understanding of the direct metal laser sintering (DMLS) process and for the successful introduction of this technology, some investigations related to the characteristics of the powders and the individual sintered layers were therefore performed. Also possibilities of hard coatings deposition for further improvements the wear and temperature resistance of tool inserts, and investigations particularly focused into the industrial applications of DMLS tooling inserts are presented.

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Crupi, Vincenzo, Emre Kara, Gabriella Epasto, Eugenio Guglielmino, and Halil Aykul. "Static behavior of lattice structures produced via direct metal laser sintering technology." Materials & Design 135 (December 2017): 246–56. http://dx.doi.org/10.1016/j.matdes.2017.09.003.

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Čapková, Veronika, and Ivana Zetková. "RP Technology Used for the Production of Metal Parts." Materials Science Forum 818 (May 2015): 280–83. http://dx.doi.org/10.4028/www.scientific.net/msf.818.280.

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Rapid prototyping (RP) is a modern technology which can produce components with very complicated shapes using different materials. This method also allows the production of components with shapes and geometry that would be very difficult to produce using conventional methods such as milling, welding and so on. A 3D printer builds an object from bottom to top, layer by layer. The purpose of this article is to introduce rapid prototyping technology for printing metal products. It focuses on various areas of application, advantages and disadvantages of this manufacturing technology as well as introduction of two methods DMLS (Direct Metal Laser Sintering) and LENS (Laser Engineered Net Shaping).

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Sharma, Monica, Ajay Bansal, Sunny Panthi, Shefali Malik, and Atulya Sharma. "To Evaluate the Marginal Fit of Metal Copings Fabricated by Conventional Casting Procedure and Direct Metal Laser Sintering Technology – an In Vitro Study." Dental Journal of Advance Studies 05, no. 01 (2017): 039–46. http://dx.doi.org/10.1055/s-0038-1672079.

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Abstract Purpose: The purpose of this in vitro study was to evaluate marginal fit of cobalt- chromium (Co-Cr) copings fabricated by direct metal laser sintering system (DMLS) and conventional lost-wax technique (LW). Materials and method: Forty tooth preparations were carried out over extracted mandibular molars. They were divided into two groups A and B of 20 each. For group A Co-Cr copings were fabricated by direct metal laser sintering (DMLS) and for group B by lost wax technique (LW). Glass –ionomer cement (GIC) was used to tack the copings over their preparations. Marginal fit was then evaluated directly under the stereomicroscope. Results: The mean marginal gap of group A was 27.9 ± 2.4 μm and group B was 40.4 ±6 μm. Statistical analysis using t - test showed highly significant difference (P>.05) between the marginal mean of the DMLS (group A) compared to LW (group B). Conclusion: The DMLS copings demonstrated superior marginal fit compared to that of conventional Co-Cr casted copings.

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Naiju, C. D., M. Adithan, Pezhinkattil Radhakrishnan, and Y. Upendra Sravan. "Functional Testing of Direct Metal Laser Sintered (DMLS) Components for Automotive Application." Advanced Materials Research 383-390 (November 2011): 6242–46. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.6242.

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This work presents the results of a study to determine the wear behavior of components manufactured by direct metal laser sintering (DMLS). Wear is an important issue in using layer manufactured parts for functional application. Two different bushes were selected for the functional testing for wear behavior studies. Specimens (bushes) were manufactured by DMLS technology and was tested for wear behavior and compared with bushes manufactured by conventional manufacturing methods. Components were manufactured by using the process parameters like sintering speed, hatch spacing, post contouring speed, hatch type and infiltration with an optimized value. Testing was carried out for bushes, used for an automobile engine starter motor. A comparative study for the wear behavior was carried out and results are discussed.

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Ziębowicz, A., A. Woźniak, B. Ziębowicz, M. Adamiak, and P. Boryło. "Microstructure and properties of CoCr alloys used in prosthetics procedure." Archives of Materials Science and Engineering 1, no. 89 (2018): 20–26. http://dx.doi.org/10.5604/01.3001.0011.5726.

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Purpose: The aim of this work was to define the influence of manufacturing technology on the chemical composition, surface topography, physicochemical and electrochemical properties of CoCr alloys obtained by casting technology and Direct Metal Laser Sintering. Design/methodology/approach: This work presents microstructural and chemical compositions obtained by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS). Additionally, corrosion pitting analysis and roughness measurement were conducted on the samples. Findings: On the basis of the investigations, it can be stated that the prosthetic restorations are different depending on the type manufacturing technology. Based on the obtained results it was found that the structures of both materials are chemically inhomogeneous. The investigated alloy exhibited similar polarization curve character. Practical implications: The rapid prototyping methods are a new technology used for getting details e.g. by CAD/CAM procedure. Using Direct Metal Laser Sintering (DMLS) method can simplify the technology of producing prosthetics restrictions and is an alternate way for standard casting technology. Originality/value: The paper presents comparative research of two Co-Cr alloys, from which the samples were obtained in conventional casting and DMLS technology.

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Sing, Swee Leong, Wai Yee Yeong, Florencia Edith Wiria, et al. "Direct selective laser sintering and melting of ceramics: a review." Rapid Prototyping Journal 23, no. 3 (2017): 611–23. http://dx.doi.org/10.1108/rpj-11-2015-0178.

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Purpose This paper aims to provide a review on the process of additive manufacturing of ceramic materials, focusing on partial and full melting of ceramic powder by a high-energy laser beam without the use of binders. Design/methodology/approach Selective laser sintering or melting (SLS/SLM) techniques are first introduced, followed by analysis of results from silica (SiO2), zirconia (ZrO2) and ceramic-reinforced metal matrix composites processed by direct laser sintering and melting. Findings At the current state of technology, it is still a challenge to fabricate dense ceramic components directly using SLS/SLM. Critical challenges encountered during direct laser melting of ceramic will be discussed, including deposition of ceramic powder layer, interaction between laser and powder particles, dynamic melting and consolidation mechanism of the process and the presence of residual stresses in ceramics processed via SLS/SLM. Originality/value Despite the challenges, SLS/SLM still has the potential in fabrication of ceramics. Additional research is needed to understand and establish the optimal interaction between the laser beam and ceramic powder bed for full density part fabrication. Looking into the future, other melting-based techniques for ceramic and composites are presented, along with their potential applications.

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Deroszewska, M. "Investigation of the impact of porosity of elements made using DMLS 3D printing technology and various printing angles on the mechanical properties and microstructure of 17-4 PH stainless steel." Journal of Achievements in Materials and Manufacturing Engineering 121, no. 2 extended (2023): 187–203. http://dx.doi.org/10.5604/01.3001.0054.3050.

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The research aimed to determine the impact of the degree of surface porosity of elements made using Direct Metal Laser Sintering (DMLS) 3D printing technology on the mechanical properties and structure of the elements by comparing the obtained test results with the standards and properties of elements manufactured using conventional methods.

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Chaar, M. Sad, Nicole Passia, and Matthias Kern. "Long-term clinical outcome of posterior metal-ceramic crowns fabricated with direct metal laser-sintering technology." Journal of Prosthodontic Research 64, no. 3 (2020): 354–57. http://dx.doi.org/10.1016/j.jpor.2019.10.002.

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Srivastava, Anil K., and Radu Pavel. "Grinding investigations of Ti-6Al-4V parts produced using direct metal laser sintering technology." International Journal of Mechatronics and Manufacturing Systems 8, no. 5/6 (2015): 223. http://dx.doi.org/10.1504/ijmms.2015.073566.

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Ecker, J. V., K. Dobrezberger, J. Gonzalez-Gutierrez, M. Spoerk, Ch Gierl-Mayer, and H. Danninger. "Additive Manufacturing of Steel and Copper Using Fused Layer Modelling: Material and Process Development." Powder Metallurgy Progress 19, no. 2 (2019): 63–81. http://dx.doi.org/10.1515/pmp-2019-0007.

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AbstractFused Layer Modelling (FLM) is one out of several material extrusion (ME) additive manufacturing (AM) methods. FLM usually deals with processing of polymeric materials but can also be used to process metal-filled polymeric systems to produce metallic parts. Using FLM for this purpose helps to save costs since the FLM hardware is cheap compared to e.g. direct metal laser processing hardware, and FLM offers an alternative route to the production of metallic components.To produce metallic parts by FLM, the methodology is different from direct metal processing technologies, and several processing steps are required: First, filaments consisting of a special polymer-metal composition are produced. The filament is then transformed into shaped parts by using FLM process technology. Subsequently the polymeric binder is removed (”debinding”) and finally the metallic powder body is sintered. Depending on the metal powder used, the binder composition, the FLM production parameters and also the debinding and sintering processes must be carefully adapted and optimized.The focal points of this study are as following:1. To confirm that metallic parts can be produced by using FLM plus debinding and sintering as an alternative route to direct metal additive manufacturing.2. Determination of process parameters, depending on the used metal powders (steel and copper) and optimization of each process step.3. Comparison of the production paths for the different metal powders and their debinding and sintering behavior as well as the final properties of the produced parts.The results showed that both materials were printable after adjusting the FLM parameters, metallic parts being produced for both metal powder systems. The production method and the sintering process worked out well for both powders. However there are specific challenges in the sintering process that have to be overcome to produce high quality metal parts. This study serves as a fundamental basis for understanding when it comes to the processing of steel and copper powder into metallic parts using FLM processing technology.

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Martins, Isabel M., Luis Esperto, and Mário J. G. Santos. "Sintering M3/2 High Speed Steel Powder by DMLS Process." Materials Science Forum 514-516 (May 2006): 1506–10. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.1506.

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The Direct Metal Laser Sintering (DMLS) technology uses a mixture of metal powders with different melting points to build objects layer by layer, directly from the geometric digitalised information. This process allows the manufacturing of prototype and production tools. In this study, the M3/2 high speed steel powder blended with 20 wt.% Cu3P and 0.25 wt.% graphite was laser-sintered, using two scan speeds (100 and 200 mm/s), keeping constant both hatching (0.30mm between two consecutive lines) and laser power (180W). The powder was spread in uniform layers of about 20m over a steel plate (100x60x6mm). The laser beam scanned small areas (12x15mm) in a single direction (OX). The surface morphology of the laser-sintered material shows that all material melted, but for 200mm/s scan speed, strings are well defined. This is probably due to a lower level of energy supplied to the material. The microstructure of the sintered material was studied in the longitudinal and transverse sections, to evaluate the consolidation process and layer growth. The material showed porosity and cracks formed during the process.

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Naiju, C. D., K. Annamalai, P. K. Manoj, and K. M. Ayaz. "Investigation on the Effect of Process Parameters on Hardness of Components Produced by Direct Metal Laser Sintering (DMLS)." Advanced Materials Research 488-489 (March 2012): 1414–18. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.1414.

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Direct metal laser sintering (DMLS) is one of the methods in layer manufacturing technologies by which metal powder can be directly used to produce both prototype and production tools. The components manufactured by DMLS should have essential hardness for its application in the industry. This study was carried out to determine the optimum process parameters influencing the hardness of the components produced by DMLS. Sintering speed, hatch spacing, post contouring, infiltration and hatch type are the process parameters taken up for study. Statistical design of experiments using Taguchi’s orthogonal array was employed for this study. The experimental data obtained were analyzed using ANOVA. From the results, it is found that one of the process parameters; scan spacing affects the hardness of the parts produced by this technology to a significant extent.

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Ayyildiz, Simel, Cem Sahin, Özlem Marti Akgün, and Feridun Basak. "Combined Treatment with Laser Sintering and Zirconium: A Case Report of Dentinogenesis Imperfecta." Case Reports in Dentistry 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/745959.

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Osteogenesis imperfecta (OI) is a heterogeneous disorder of connective tissue that manifests mainly as skeletal deformity and bone fragility. Dentinogenesis imperfecta (DI) is sometimes an accompanying symptom of OI. The treatment protocol of these patients varies according to the clinical appearance. The case report here describes complete mouth rehabilitation of an 18-year-old male patient with OI and DI using direct metal laser sintering (DMLS) technique of metal-ceramic restorations and zirconium all-ceramic crowns. DMLS is an additive metal fabrication technology that is simpler, more precise, and healthier than conventional manufacturing and can be remarkably cost effective. Moreover, the technique affords highly accurate production of fixed partial dentures with ideal marginal fit and excellent mechanical properties. The patient was treated using a multidisciplinary strategy that focused on controlling caries, protecting teeth from further wear, obtaining an appropriate vertical dimension, and providing soft tissue support to return the facial profile to a normal appearance using new technology in the field of prosthetics.

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Mangano, F., L. Chambrone, R. van Noort, C. Miller, P. Hatton, and C. Mangano. "Direct Metal Laser Sintering Titanium Dental Implants: A Review of the Current Literature." International Journal of Biomaterials 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/461534.

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Statement of Problem. Direct metal laser sintering (DMLS) is a technology that allows fabrication of complex-shaped objects from powder-based materials, according to a three-dimensional (3D) computer model. With DMLS, it is possible to fabricate titanium dental implants with an inherently porous surface, a key property required of implantation devices.Objective. The aim of this review was to evaluate the evidence for the reliability of DMLS titanium dental implants and their clinical and histologic/histomorphometric outcomes, as well as their mechanical properties.Materials and Methods. Electronic database searches were performed. Inclusion criteria were clinical and radiographic studies, histologic/histomorphometric studies in humans and animals, mechanical evaluations, andin vitrocell culture studies on DMLS titanium implants. Meta-analysis could be performed only for randomized controlled trials (RCTs); to evaluate the methodological quality of observational human studies, the Newcastle-Ottawa scale (NOS) was used.Results. Twenty-seven studies were included in this review. No RCTs were found, and meta-analysis could not be performed. The outcomes of observational human studies were assessed using the NOS: these studies showed medium methodological quality.Conclusions. Several studies have demonstrated the potential for the use of DMLS titanium implants. However, further studies that demonstrate the benefits of DMLS implants over conventional implants are needed.

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Miozga, Rafael, and Marta Kurek. "Effect of print orientation using DMLS method on strength of materials." MATEC Web of Conferences 338 (2021): 01017. http://dx.doi.org/10.1051/matecconf/202133801017.

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The paper reported the results of a study concerned with the principle of operation of the 3D printing technology using the method of selective sintering of metallic powders, and taking into account their advantages and drawbacks. The principle of the operation of 3D printing technology applying the DMLS (Direct Metal Laser Sintering) method is presented. On the basis of the performed tests, the anisotropy of the printed materials is demonstrated. The reasons responsible for this phenomenon are identified. The paper presents the results of the strength tests which indicate that the crack during the test occur in the building direction of the layers during printing. The results were compiled for two different types of specimens and two different testing machines.

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Karolewska, Karolina, and Bogdan Ligaj. "Mechanical properties comparison of Ti6Al4V produced by different technologies under static load conditions." MATEC Web of Conferences 290 (2019): 08010. http://dx.doi.org/10.1051/matecconf/201929008010.

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The most commonly used technology among the additive manufacturing is Direct Metal Laser Sintering (DMLS). This process is based on selective laser sintering (SLS). The method gained its popularity due to the possibility of producing metal parts of any geometry, which would be difficult or impossible to obtain by the use of conventional manufacturing techniques. Materials used in the elements manufacturing process are: titanium alloys (e.g. Ti6Al4V), aluminium alloy AlSi10Mg, etc. Elements printed from Ti6Al4V titanium alloy find their application in many industries. Details produced by additive technology are often used in medicine as skeletal, and dental implants. Another example of the DMLS elements use is the aerospace industry. In this area, the additive manufacturing technology produces, i.a. parts of turbines. In addition to the aerospace and medical industries, DMLS technology is also used in motorsport for exhaust pipes or the gearbox parts. The research objects are samples for static tests. These samples were made of Ti6Al4V alloy by the DMLS method and the rolling method from a drawn rod. The aim of the paper is the mechanical properties comparative analysis of the Ti6Al4V alloy produced by the DMLS method under static loading conditions and microstructure analysis of this material.

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Acél, Artúr Benjámin, György Falk, Ferenc Dömötör, and János Takács. "Design and Quality Assured Manufacturing of Free Form Metal Prostheses by Selective Laser Melting Technology." Hungarian Journal of Industry and Chemistry 49, no. 2 (2021): 29–34. http://dx.doi.org/10.33927/hjic-2021-18.

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This paper concerns the key steps in the design, manufacturing and certification of customized acetabular cups. The process is based on the compilation of computed tomography scans to create a surface that is generated from the point cloud of the surface model. As a result, the surface model is obtained. The final step is the manufacturing itself. The features of Selective Laser Melting, also referred to as Direct Metal Laser Sintering in the literature, the placement of workpieces in the construction space and peculiarities of the support design are described. Important technological preparations of the EOS M 100 3D camera for the manufacturing of implants will be described. Implants were made of the 316L and Ti6Al4V metal powders. The finished test pieces were subjected to non-destructive as well as destructive mechanical and material structural testing to qualify implants by using the appropriate quality assurance system.

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BOJKO, Łukasz, Wojciech RYNIEWICZ, Anna M. RYNIEWICZ, and Marcin KOT. "STUDY OF THE IMPACT OF INCREMENTAL TECHNOLOGY ON MECHANICAL AND TRIBOLOGICAL PROPERTIES OF BIOMATERIALS." Tribologia 273, no. 3 (2018): 29–38. http://dx.doi.org/10.5604/01.3001.0010.6117.

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The latest method for creating denture replenishment in CAD / CAM systems is Direct Metal Laser Sintering (DMLS) technology. With the use of DMLS, prosthodontics, implant prosthetics, and facial-cranialjaw surgery adapted to individual patient conditions can be realized. The aim is to evaluate the strength, microstructure, and tribological properties of Ti6Al4V and CoCrMo alloys obtained from DMLS technology in the aspect of therapeutic constructions. The conducted tests show that, in the DMLS technology, as compared to milling technology preceded by casting and forging or pressed powder and sintering, for the same percentage composition of elements, the micromechanical properties, microstructural and tribological change. This procedure, from which constructions for various dental applications are obtained, is the new technology preferred for making permanent restorations faced with ceramics, producing intravascular implants, and implants of the temporomandibular joint. It can be an alternative to conventional cast-based methods and CAD / CAM based milling.

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Kovács, Dorina, and Dávid Miklós Kemény. "Effect of plasma nitriding of austenitic stainless steel produced by direct metal laser sintering." Acta Metallurgica Slovaca 27, no. 4 (2021): 190–94. http://dx.doi.org/10.36547/ams.27.4.1172.

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A special additive manufacturing (AM), called as Direct Metal Laser Sintering (DMLS), is a technology that produces 3D workpieces using a wide range of different metals as raw materials. The aim of current research is to investigate the plasma nitriding effect on the DMLS produced samples. The direct current plasma nitriding treatment was achieved at 440 °C for 4 hours with 75%N2 – 25%H2 gas mixture. Before the treatment, the 316L austenitic stainless steels samples were ground with different methods to modify the surface roughness. Scanning electron microscope (SEM), X-ray diffractometer, glow discharge optical electron spectroscopy, Vickers microhardness tester and potentiodynamic corrosion test were used for the characterization of surface properties. The results demonstrated that the surface roughness did not affect the outcome of the plasma nitriding, but the corrosion resistance increases with the decrease of the surface roughness compared to the untreated 3D sample.

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Romanenko, Vladyslav, and Oleh Nazarenko. "Comparative analysis of modern technologies of additive production." System Research in Energy 2024, no. 2 (2024): 84–96. http://dx.doi.org/10.15407/srenergy2024.02.084.

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In today's conditions, 3D printing is used to create unique models, prototypes, and equipment necessary for conducting experiments and studying various phenomena and processes, for the rapid prototyping of various parts and devices in scientific and engineering research. 3D printing technologies are actively used to create individual medical implants, prostheses, and organ models for training and planning operations, which significantly improves the quality of medical care. In the aerospace and automotive industries, additive manufacturing is used to create lightweight and durable parts helping to reduce weight and improve vehicle efficiency. The use of additive manufacturing methods, technologies, and tools allows you to check and test designs and concepts before mass production. In this work, a detailed analysis of various existing 3D printers is carried out depending on the tasks, and modern technologies of additive manufacturing are investigated depending on the set goals and scientific and applied tasks. Such technologies include Fused Deposition Modeling, Stereolithography, Selective Laser Sintering, Direct Metal Laser Sintering, and Digital Light Processing. In the work, a comparative analysis of these technologies was carried out according to various criteria, such as principle of operation, materials, resolution, surface finish, accuracy, speed, strength, application, cost, complexity of parts, and post-processing. For each technology, the advantages and disadvantages of its use are determined depending on the goals and objectives. It should be noted that some materials may not be suitable for printing complex parts or require additional support during the printing process. This can lead to complexity in the processing of products and increase the time and costs of printing. Improper selection of materials for 3D printing can be harmful to the environment or human health when used incorrectly. For example, some plastic materials may emit toxic elements or have low biodegradability. Also, using excess expensive material unnecessarily can increase the cost of the project. Keywords: additive manufacturing, 3D printing, additive manufacturing technologies, Fused Deposition Modeling, Stereolithography, Selective Laser Sintering, Direct Metal Laser Sintering, Digital Light Processing.

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Galantucci, Luigi Maria, Alessandro Pellegrini, Maria Grazia Guerra, and Fulvio Lavecchia. "3D Printing of parts using metal extrusion: an overview of shaping debinding and sintering technology." Advanced Technologies & Materials 47, no. 1 (2022): 25–32. http://dx.doi.org/10.24867/atm-2022-1-005.

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Additive Manufacturing (AM) is the fabrication of real three-dimensional objects from plastics and metals by adding material, layer by layer. One of the most common AM processes is the Material Extrusion (ME) based on different approaches: plunger, filament and screw. Material Extrusion technologies of metal-polymer composites is expanding and it mainly uses the filament or plunger-based approaches. The feedstock used is a mixture of metal powder (from 55 vol% to about 80 vol%) dispersed in a thermoplastic matrix, as the Metal Injection Molding (MIM) materials. The process consists of three steps: shaping, debinding and sintering. The first step provides the extrusion of filament to realize a primary piece called “green part”; subsequent steps, debinding and sintering, allow to obtain a full metal part by dissolving the polymeric binder. The latter can be carried out using solvents, heat and the combination of them. The interest toward this technology is driven by the possibility to replace other Metal AM technologies, such as Selective Laser Melting or Direct Energy Deposition, in sectors like rapid-tooling or mass production, with several benefits: simplicity, safety to use and saving material and energy. The aim of this keynote is to provide a general overview of the main metal ME technologies considering the more technical aspects such as process methodologies, 3D printing strategy, process parameters, materials and possible applications for the manufacturing of samples on a 3D consumer printer.

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Subrahmanyam, A. P. S. V. R., Kondapalli Siva Prasad, and P.Srinivasa Rao. "A Review on Mechanical and Corrosion Behaviour of DMLS Materials." Engineering Science & Technology 1, no. 2 (2020): 62–83. http://dx.doi.org/10.37256/est.122020319.

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Direct Metal Laser Sintering (DMLS) is an Additive Manufacturing (AM) technique in which the metal powder will be sintered in selected regions as per 3D CAD file in stack manner in order to produce a three dimensional object with less effort, in less possible time and with minimal wastage of metal. In this paper most widely used DMLS metal powders mechanical and corrosion properties were analyzed and the effect of post processes on the material properties were discussed. The objective of the paper is to fuse the works done so far and to identify gaps to identify the key areas of this technology. The promising and successful application of this revolutionary technology in various sectors like biomedical, aerospace and automotive was also discussed based on material behaviour at different operating conditions. This review would help researchers to find challenges in this booming technology. As per the materials point of view future research prospective was suggested in depth in light of present review.

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Vandzura, Radoslav, Vladimir Simkulet, Matus Gelatko, Michal Hatala, and Zuzana Mitalova. "Effect of Hardening Temperature on Maraging Steel Samples Prepared by Direct Metal Laser Sintering Process." Machines 11, no. 3 (2023): 351. http://dx.doi.org/10.3390/machines11030351.

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This paper deals with the application of the direct metal laser sintering (DMLS) process, which already has a dominant position in the area of additive manufacturing (AM). This DMLS technology is used in many branches of industry and medicine, especially in piece production, small series, and prototypes. The portfolio of used metal powder materials includes aluminum alloys, austenitic steels, maraging steels, special alloys of nickel and titanium. The properties of these products are very often improved by further heat treatment after printing, such as a hardening process, by which microstructure and hardness can be increased. Heat treatment processes of metal AM components are already described, but experiments focused on optimization of these processes are still missing. In the article, the maraging steel samples printed by the DMLS method are subjected to testing after hardening processes, which differ by reducing the maintaining time at a defined temperature, recommended by the manufacturer. The result of the evaluation will be the reaching of similar results, which are set by the powder manufacturer, however, with shorter time of samples treatment. Therefore, the elevated temperature is selected, with the purpose of monitoring the shortest possible time of a temperature impact. The experimental temperature was set 590 °C with different durations at this temperature, for 1, 2, 3, 4, 5 and 6 h. The cooling process runs controlled in the furnace or in the still air. The maintaining time proved to be the most ideal already at 1 h exposure and cooled in the still air, where a higher hardness value of around 50 HRC was reached. During the resulting microstructure evaluations, fine carbids and martensitic lamellae were observed. More uniform and finer lamellar microstructure occurred at 5 and 6 h temperature intervals.

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Nancharaiah, Tata, V. Sudheer Kumar Reddy, T. Chakravarthi, G. Tarun Sai Chowdary, and Y. Brahma Teja. "Experimental Study on the Effect of Process Parameters on the Build Time and Part Accuracy of Direct Metal Laser Sintering Components." Applied Mechanics and Materials 917 (October 13, 2023): 49–56. http://dx.doi.org/10.4028/p-fzsqm6.

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3D printing is an emerging technology that creates parts straight from CAD models. Direct Metal Laser Sintering (DMLS) is a 3D printing method that is becoming increasingly popular in the aerospace, medical, and orthopedics sectors. These are usually focused on precise, long-lasting, and lightweight parts. DMLS is an Additive Manufacturing (AM) technique that employs a laser to sinter a selected area of a metallic powder layer by layer to produce the required metal components. The heating power of the laser was discovered to have a strong effect on phase formation. The major issue with this process is that high residual and large deformations are introduced to the components during manufacturing. This causes a change in the fatigue strength of a part and can even lead to cracks. The quality of the DMLS parts is affected by various process parameters. In this study, the design of experiments is used to investigate the consequences of process parameters used in the DMLS process to make metal parts. Process parameters such as laser power and scanning speed must be identified because they have the largest influence on the part's characteristics. (Build time, part accuracy). The change in the controlling parameters, or process parameters, in the DMLS method, has been found to affect material properties, according to a literature review. Thus, in the proposed work, three process parameters laser speed, scanning speed, and hatching distance are taken into account at two distinct levels. L4 orthogonal arrays are used in the studies. Experimental research is done on the manufacturing process, build time and component accuracy. Finally, the impact of each parameter on the quality aspects is discussed based on the experimental findings.

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Guzanová, Anna, Dagmar Draganovská, Gabriela Ižaríková, et al. "The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology." Metals 9, no. 10 (2019): 1055. http://dx.doi.org/10.3390/met9101055.

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This article is focused on the effect of position on a build platform on the hardness, roughness and corrosion rate of parts (Ti6Al4V) produced by direct metal laser sintering (DMLS) technology. During the sintering process, the test samples were located at key positions—at the corners and in the middle of the build platform. An experimental program started with a microstructure investigation in two perpendicular directions in individual positions. The selected mechanical property—hardness—was investigated on metallographic cuts in both directions and all positions, and data sets underwent a statistical analysis (analysis of variance (ANOVA), t-test, F-test). The same procedure was repeated for an assessment of position effect to surface roughness (Kruskal–Wallis test) and material corrosion resistance. On the build platform, the course of hardness, roughness, and corrosion rate values that can be expected in individual positions was mapped in detail.

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Eva Schmidova, Premysl Hojka, Bohumil Culek, Filip Klejch, and Michal Schmid. "Dynamic Strength and Anisotropy of Dmls Manufactured Maraging Steel." Communications - Scientific letters of the University of Zilina 21, no. 3 (2019): 35–39. http://dx.doi.org/10.26552/com.c.2019.3.35-39.

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This paper deals with maraging steel, as a prospective material for the 3D printed lightened structural parts of transport means. Direct Metal Laser Sintering technology was tested for creation of a thin-wall structure with defined internal geometry. The referential samples prepared by the DMLS technology were examined under quasi-static and high strain rate loading using a servo-hydraulic testing machine at strain rates up to 1400 s-1. Microstructural analyses served for evaluation of structural homogeneity and metallurgy quality, including the influence of crystallization gradient. The stabile ductile fracture mode was proven by fractography analyses, even at a maximal strain rate. The post-impact tests were conducted to evaluate the local residual plasticity by indentation tests.

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Jiao, Junke, Shengyuan Sun, Zifa Xu, Jiale Wang, Liyuan Sheng, and Jicheng Gao. "Fabricating Inner Channels in Laser Additive Manufacturing Process via Thin-Plate-Preplacing Method." Materials 16, no. 19 (2023): 6406. http://dx.doi.org/10.3390/ma16196406.

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This paper presents a hybrid manufacturing process for the preparation of complex cavity structure parts with high surface quality. Firstly, laser precision packaging technology is utilized to accurately connect a thin plate to a substrate with microchannel. Secondly, Direct Metal Laser-Sintering (DMLS) technology is utilized to completely shape the part. The morphology and microstructure of laser encapsulated specimens and DMLS molded parts were investigated. The results show that the thin plate and the substrate can form a good metallurgical bond. The lowest surface roughness of the DMLS molded parts was 1.18 μm. The perpendicularity between the top of the microchannel and the side wall was optimal when the laser power was 240 W. Consequently, the hybrid manufacturing process effectively solves the problems of poor surface quality and powder sticking of closed inner cavities. The method effectively eliminates the defects of adhesive powder in the inner cavity of the DMLS microchannel, improves the finish, and solves the problem that mechanical tools cannot be processed inside the microchannel, which lays the foundation for the research of DMLS high-quality microchannel process.

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Dvorak, Karel, Jana Dvorakova, Lucie Zarybnicka, and Zdenek Horak. "Influence of 3D Printing Topology by DMLS Method on Crack Propagation." Materials 14, no. 23 (2021): 7483. http://dx.doi.org/10.3390/ma14237483.

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The presented text deals with research into the influence of the printing layers’ orientation on crack propagation in an AlSi10Mg material specimen, produced by additive technology, using the Direct Metal Laser Sintering (DMLS) method. It is a method based on sintering and melting layers of powder material using a laser beam. The material specimen is presented as a Compact Tension test specimen and is printed in four different defined orientations (topology) of the printing layers—0°, 45°, 90°, and twice 90°. The normalized specimen is loaded cyclically, where the crack length is measured and recorded, and at the same time, the crack growth rate is determined. The evaluation of the experiment shows an apparent influence of the topology, which is essential especially for possible use in the design and technical preparation of the production of real machine parts in industrial practice. Simultaneously with the measurement results, other influencing factors are listed, especially product postprocessing and the measurement method used. The hypothesis of crack propagation using Computer Aided Engineering/Finite Element Method (CAE/FEM) simulation is also stated here based on the achieved results.

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Savencu, Cristina Elena, Liliana Porojan, and Cristina Maria Borţun. "Applications of additive technologies in dentistry." Romanian Journal of Stomatology 62, no. 3 (2016): 81–85. http://dx.doi.org/10.37897/rjs.2016.3.6.

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Aim. Untill now CAD/CAM technologies meant exclusively milled dental restorations. With the development of 3D. Printing technologies they are penetrating in the medical field. The purpose of this paper is to illustrate the application of additive technologies in dentistry. Materials and methods. On a maxillary first molar preparation two metal copings were made for fixed metal-ceramic partial restorations using additive technologies: Direct MetalLaser Sintering (DMLS) and Selective Laser Melting (SLM). Digital light processing technology (DLP) was used to produce a surgical guide for insertion of a post-extraction dental implant and also for a long-term temporary restoration. Results. Innovative additive technologies used in dental technology shows numerous advantages over classical technologies slip-casting and milling procedures for alloys and polymerization for resin materials, resulting prosthetic parts with a different internal structure, faster, with less cost, with a huge development potential. Conclusions. The benefits of using CAD/CAM technology includes reduced treatment time, superior accuracy and precise visualization of the final result of the treatment.

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Larosa, Maria Aparecida, André Luiz Jardini, Cecília Amélia de Carvalho Zavaglia, Paulo Kharmandayan, Davi Reis Calderoni, and Rubens Maciel Filho. "Microstructural and Mechanical Characterization of a Custom-Built Implant Manufactured in Titanium Alloy by Direct Metal Laser Sintering." Advances in Mechanical Engineering 6 (January 1, 2014): 945819. http://dx.doi.org/10.1155/2014/945819.

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Custom-built implants manufacture has always presented difficulties which result in high cost and complex fabrication, mainly due to patients’ anatomical differences. The solution has been to produce prostheses with different sizes and use the one that best suits each patient. Additive manufacturing technology, incorporated into the medical field in the late 80's, has made it possible to obtain solid biomodels facilitating surgical procedures and reducing risks. Furthermore, this technology has been used to produce implants especially designed for a particular patient, with sizes, shapes, and mechanical properties optimized, for different areas of medicine such as craniomaxillofacial surgery. In this work, the microstructural and mechanical properties of Ti6Al4V samples produced by direct metal laser sintering (DMLS) are studied. The microstructural and mechanical characterizations have been made by optical and scanning electron microscopy, X-ray diffraction, and microhardness and tensile tests. Samples produced by DMLS have a microstructure constituted by hexagonal α′ martensite with acicular morphology. An average microhardness of 370 HV was obtained and the tensile tests showed ultimate strength of 1172 MPa, yield strength of 957 MPa, and elongation at rupture of 11%.

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Živčák, Jozef, Ema Nováková-Marcinčínová, Ľudmila Nováková-Marcinčínová, Tomáš Balint, and Michal Puškár. "Increasing Mechanical Properties of 3D Printed Samples by Direct Metal Laser Sintering Using Heat Treatment Process." Journal of Marine Science and Engineering 9, no. 8 (2021): 821. http://dx.doi.org/10.3390/jmse9080821.

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The paper deals with the evaluation of mechanical properties of 3D-printed samples based on high-strength steel powder system maraging steel using direct metal laser sintering (DMLS), which is currently being put into technical practice. The novelty of this article is that it analyzes mechanical properties of samples both printed and age hardened as well as examining the fracture surfaces. When comparing the manufacturer’s range with our recorded values, samples from Set 1 demonstrated strength ranging from 1110 to ultimate 1140 MPa. Samples from Set 2 showed tensile strength values that were just below average. Our recorded range was from 1920 to ultimate 2000 MPa while the manufacturer reported a range from 1950 to 2150 MPa. The tensile strength was in the range from 841 to ultimate 852 MPa in Set 1, and from 1110 to ultimate 1130 MPa in Set 2.

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YILMAZ, Mustafa Safa. "A Determination of the Corrosion and Microstructure Properties of AlSi10Mg Material Produced by Different Direct Metal Laser Sintering (DMLS) Process Parameters." Bitlis Eren Üniversitesi Fen Bilimleri Dergisi 11, no. 3 (2022): 791–97. http://dx.doi.org/10.17798/bitlisfen.1102823.

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Additive Manufacturing (AM) has been developing with increasing interest in recent years. The development in this technology will accelerate with the increase in material, process, and product quality. It is therefore essential to investigate these shortcomings of additive manufacturing products. In this study, the microstructure and corrosion properties of the material (AlSi10Mg) were investigated by changing the production parameters in the Direct Metal Laser Sintering (DMLS) process. Energy density was considered in parameter selection. The corrosion, topography, and mechanical properties of the DMLS-AlSi10Mg material were investigated in detail, depending on the process parameters. It has been determined that the corrosion resistance and hardness of the material are directly related to the porosity level in the structure.

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Patalas-Maliszewska, Justyna, Eugene Feldshtein, Oleg Devojno, Małgorzata Śliwa, Marharyta Kardapolava, and Nikolaj Lutsko. "Single Tracks as a Key Factor in Additive Manufacturing Technology—Analysis of Research Trends and Metal Deposition Behavior." Materials 13, no. 5 (2020): 1115. http://dx.doi.org/10.3390/ma13051115.

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In recent years, general studies on Selective Laser Melting (SLM)/Selective Laser Sintering (SLS)/direct metal deposition (DMD) technologies, as well as studies on detailed issues in this area, have been carried out. However, a research gap is observed in investigations into the features of single tracks in the above-mentioned technologies. On the basis of data published in 2016–2019, an approach was adopted for a preliminary quantitative analysis of the knowledge base and also trends observed in the development of new technologies. This study demonstrates the effectiveness of the data mining technique based on the Bayes algorithm for analyzing trends in processes of additive manufacturing and the practical application of the knowledge received using the Bayes algorithm. After the analyses referred to above were completed, single and double layers of a composite material based on the Ni-based alloy and Fe–Al bronze were analyzed under different processing conditions. The effects of laser spot speeds and pitches on microhardness, microstructure, and interlayers’ features were described. So, the innovative approach, namely, the combination of the analysis of the scientific database of the phenomenon under study and the subsequent experimental investigation of its features, is the scientific novelty of the present study.

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Żaba, Krzysztof, Lechosław Tuz, Piotr Noga, Stanislav Rusz, and Rostislav Zabystrzan. "Effect of Multi-Variant Thermal Treatment on Microstructure Evolution and Mechanical Properties of AlSi10Mg Processed by Direct Metal Laser Sintering and Casting." Materials 15, no. 3 (2022): 974. http://dx.doi.org/10.3390/ma15030974.

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This article presents a study on the influence of temperature and time of multi-variant heat treatment on the structure and properties of materials produced in direct metal laser sintering (DMLS) and casting technology. The materials were manufactured in the form of cuboidal elements with a cross-section of 1.5 mm × 15 mm and a length of 60 mm. The samples prepared in this way had a similar volume, but due to the production technology the metal crystallization took place at different rates and directions. In the cast, the direction of heat transfer was toward the mold, and the DMLS was directed locally layer by layer. The small thickness of the cast material allowed reaching conditions similar to the DMLS cooling process. Both DMLS and cast samples show similar mechanical properties (hardness) achieved after long ageing time, i.e., 16 h at 170 °C. The maximum hardness was observed for 8 h. In the DMLS samples, in contrast to cast samples, no lamellar precipitates of silicon were observed, which indicates their better resistance to cracking

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Chernohorskyi, Denis, Marharyta Voller, Aleksandr Vasilyev, Yurii Chepurnyi, and Andrii Kopchak. "Clinical Efficacy of Patient-specific Implants Manufactured using Direct Metal Laser Sintering (DMLS) Technology in Patients with Mandibular Defects." Journal of Diagnostics and Treatment of Oral and Maxillofacial Pathology 4, no. 9 (2020): 162–77. http://dx.doi.org/10.23999/j.dtomp.2020.9.3.

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Purpose: The purpose of this study was to compare the clinical efficacy of patient-specific implants (PSIs) in patients with mandibular defects in the early and distant postoperative period. Materials and Methods: The surgical results in 60 patients with postoperative and posttraumatic mandibular discontinuous defects were analyzed. The patients were treated at the Center of Maxillofacial Surgery and Dentistry, Kyiv Regional Clinical Hospital in the period from 2015 to 2020. Results: Despite certain functional limitations and residual aesthetic deficiency, 34 patients (85%) of the main group and 9 (45 percent) of the control group noted an improvement in their quality of life and were satisfied with the results of the operation (р < 0.05). Conclusions: The use of PSIs, compared to traditional methods of bone grafting, allow to achieve a more accurate restoration of the anatomical shape of the mandible in areas with complex geometry and probably better aesthetic results, and significantly reduces the frequency of secondary displacement of bone fragments due to plastic deformation and destruction of fixation elements (p < 0.05). At the same time, it probably does not affect the frequency of purulent-inflammatory complications, unsatisfactory clinical results and the effectiveness of the restoration of masticatory function in patients with mandibular defects.

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Panda, Mousumi, Anjana Raut, Sadanand Hota, and Purnendu Bhushan. "The use of direct metal laser sintering technology in the management of acquired maxillofacial defects due to malignant neoplasm." Indian Journal of Multidisciplinary Dentistry 9, no. 2 (2019): 111. http://dx.doi.org/10.4103/ijmd.ijmd_13_19.

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Journal articles on the topic 'Direct Metal Laser Sintering technology'

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