Relevant bibliographies by topics / Direct laser sintering

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Direct laser sintering'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Direct laser sintering"

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Grünberger, Thomas, and Robert Domröse. "Direct Metal Laser Sintering." Laser Technik Journal 12, no. 1 (January 2015): 45–48. http://dx.doi.org/10.1002/latj.201500007.

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Băilă, Diana-Irinel. "Dental Restorations of Co-Cr Using Direct Metal Laser Sintering Process." International Journal of Materials, Mechanics and Manufacturing 6, no. 2 (April 2018): 94–98. http://dx.doi.org/10.18178/ijmmm.2018.6.2.354.

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Agarwala, Mukesh, David Bourell, Joseph Beaman, Harris Marcus, and Joel Barlow. "Direct selective laser sintering of metals." Rapid Prototyping Journal 1, no. 1 (March 1995): 26–36. http://dx.doi.org/10.1108/13552549510078113.

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Ebersold, Zoran, Nebojsa Mitrovic, Slobodan Djukic, Branka Jordovic, and Aleksandar Peulic. "Defectoscopy of direct laser sintered metals by low transmission ultrasonic frequencies." Science of Sintering 44, no. 2 (2012): 177–85. http://dx.doi.org/10.2298/sos1202177e.

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This paper focuses on the improvement of ultrasonic defectoscopy used for machine elements produced by direct laser metal sintering. The direct laser metal sintering process introduces the mixed metal powder and performs its subsequent laser consolidation in a single production step. Mechanical elements manufactured by laser sintering often contain many hollow cells due to weight reduction. The popular pulse echo defectoscopy method employing very high frequencies of several GHz is not successful on these samples. The aim of this paper is to present quadraphonic transmission ultrasound defectoscopy which uses low range frequencies of few tens of kHz. Therefore, the advantage of this method is that it enables defectoscopy for honeycombed materials manufactured by direct laser sintering. This paper presents the results of testing performed on AlSi12 sample.
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Tang, Y., J. Y. H. Fuh, H. T. Loh, Y. S. Wong, and L. Lu. "Direct laser sintering of a silica sand." Materials & Design 24, no. 8 (December 2003): 623–29. http://dx.doi.org/10.1016/s0261-3069(03)00126-2.

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Kang, Hyun Goo, Toshiko Osada, and Hideshi Miura. "Density Gradient Materials by Direct Metal Laser Sintering." Advanced Materials Research 89-91 (January 2010): 281–84. http://dx.doi.org/10.4028/www.scientific.net/amr.89-91.281.

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The direct metal laser sintering process was applied to produce density gradient materials of stainless steel 316L. In order to understand the mechanism of forming porous structure, the influence of laser power, scan rate and scan pitch on the porosity were investigated by measuring density of produced samples and observing cross-sectional microstructures. Laser power greatly affected to the porosity by forming clusters of melted metal powders. It was found that the size change of clusters plays a role in forming porous structure. Eventually, three dimensional sample owing density gradient structures was manufactured.
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Mierzejewska, Ż. A. "Process Optimization Variables for Direct Metal Laser Sintering." Advances in Materials Science 15, no. 4 (December 1, 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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Zhu, H. H., J. Y. H. Fuh, and L. Lu. "Formation of Fe—Cu metal parts using direct laser sintering." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 217, no. 1 (January 1, 2003): 139–47. http://dx.doi.org/10.1243/095440603762554686.

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The direct laser sintering process is currently being used to manufacture metallic parts for prototyping and tooling directly. This paper reports on the direct laser sintering of Fe—Cu metal powder using a 200 W CO2 laser. The effects of the ratio of Fe to Cu, the scan speed and atmosphere on the distortion, surface morphology and surface roughness have been investigated. The experiment also investigated the role of adding W particles to the Fe—Cu mixture. The result shows that adding W particles can reduce part distortion. To find the effect of gas protection in laser sintering, the three-dimensional specimens fabricated in both air and N2 atmosphere are also compared.
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Cardaropoli, Francesco, Fabrizia Caiazzo, and Vincenzo Sergi. "Evolution of Direct Selective Laser Sintering of Metals." Advanced Materials Research 383-390 (November 2011): 6252–57. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.6252.

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Direct Metal Selective Laser Sintering (DMSLS) is a layer-by-layer additive process for metal powders, which allows quick production of complex geometry parts. The aim of this study is to analyse the improvement of DMSLS with “EOSINT M270”, the new laser sintering machine developed by EOS. Tests were made on sintered parts of Direct Metal 20 (DM20), a bronze based powder with a mean grain dimension of 20 μm. Different properties and accuracy were evaluated for samples manufactured with three different exposure strategies. Besides mechanical properties, the manufacturing process was also examined in order to evaluate its characteristics. The quality of laser sintered parts is too affected by operator experience and skill. Furthermore, critical phases are not automatic and this causes an extension of time required for the production. Due to these limitations, DMSLS can be used for Rapid Manufacturing, but it is especially suitable to few sample series.
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Simchi, A., and H. Pohl. "Direct laser sintering of iron–graphite powder mixture." Materials Science and Engineering: A 383, no. 2 (October 2004): 191–200. http://dx.doi.org/10.1016/j.msea.2004.05.070.

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Dissertations / Theses on the topic "Direct laser sintering"

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Dewidar, Montasser Marasy A. "Direct and indirect laser sintering of metals." Thesis, University of Leeds, 2002. http://etheses.whiterose.ac.uk/3973/.

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Manufacturing functional prototypes and tools using conventional methods usually is a time consuming procedure with multiple steps. The pressure to get products to market faster has resulted in the creation of several Rapid Prototyping (RP) techniques. However, potentially one of the most important areas of Rapid Manufacturing (RM) technology lies in the field of Rapid Tooling (RT). Layer manufacture technologies are gaining increasing attention in the manufacturing sector for the production of polymer mould tooling. Layer manufacture techniques can be used in this potential manufacturing area to produce tooling either indirectly or directly, and powder metal based layer manufacture systems are considered an effective way of producing rapid tooling. Selective Laser Sintering (SLS) is one of available layer manufacture technologies. SLS is a sintering process in which shaped parts are built up layer by layer from bottom to top of powder material. A laser beam scans the powder layer, filling in the outline of each layers CAD-image, and heats the selected powder to fuse it. This work reports the results of an experimental study examining the potential of layer manufacturing processes to deliver production metal tooling for manufacture of polymer components. Characterisation of indirect selective laser sintering and direct selective laser sintering to provide the metal tooling is reported. Three main areas were addressed during the study: mechanical strength, accuracy, and build rate. Overviews of the results from the studies are presented. Two materials (RapidSteel 2.0 and special grade of highspeed steel) and also two generations of SLS machines Sinterstation 2000 and sinterstation research machine, which was constructed in Leeds) were used during this work.
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Olakanmi, Eyitayo Olatunde. "Direct selective laser sintering of aluminium alloy powders." Thesis, University of Leeds, 2008. http://etheses.whiterose.ac.uk/1476/.

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The SLS/SLM of aluminium powder had been investigated by studying the effect of powder properties and laser processing parameters on the microstructures and properties of both single layer and multiple layer builds. On the basis of experimental evidence, the SLS/SLM of aluminium powders could be categorised into full melting (SLM) which was found to have occurred in both pure and pre-alloyed aluminium powders, and binary liquid phase sintering (SLS) which occurred in blended bimodal or trimodal powders. That successful disruption of the oxide film is possible is a significant result, as is the constitutional effect on this. The spheroidisation and oxide disruption phenomena in SLS/SLM processed aluminium powders arc suggested to be mainly controlled by the amount of oxide on the as-received powder's surface, the degree of the uniformity of the distribution of the surface oxide film covering the aluminium particles as well as the nature of thermal mismatch existing between the oxide film and the parent aluminium particle which was dependent on the phase present in the oxide film (alumina, mullite, and spinel). It was discovered that the attainment of high sintered density and desirable microstructural properties in the blended aluminium powders is consequent upon the determination of the right processing conditions, appropriate choice of powders (in terms of particle size distribution, spherical particle shape, and component ratio). Moreover, it is now evident that chemical constitution of the blended aluminium powders only becomes influential in the determination of the properties of SLS processed parts when the choice of processing parameters and powder properties are correct. The choice of powder properties determines the thermal conductivity of the powder bed which in effect controls the sintered properties. This had been inferred from the relationship between powder tapping density on one hand, and selective laser sintered (SLS) density, dendrite spacing and fraction of primary phase on the other hand. In making smaller samples, it has been shown that the attainment of high sintered density (up to 90%) and a good microstructure are feasible. These arc accompanied by reasonable hardness values, comparable to those of cast Al-12wt%Si castings. In fabricating larger sized parts for mechanical testing, defects such as delamination became more noticeable leading to poor mechanical properties in those samples. Thus, it is now clear that physical limitations of the sintering machine hinder the production of SLS/SLM processed parts having excellent structural integrity. On the basis of this work, it is envisaged that the use of pre-alloyed Al-Si powders of uniform composition, but a wider particle size and size distribution, blended to optimise the bed density, offers the potential to produce light alloy components by SLS. In conclusion, the specific laser energy input, the component ratio, and the particle size and size distribution of the powder were found to have strongly influenced the densitication mechanism and the solidification process in a small sized aluminium powdered part fabricatedb y SLS/SLM process.
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Pozzi, Francesco. "Direct metal laser sintering of steel with high vanadium content." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13548/.

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La definizione di "rapid prototyping" è ben nota. Ci si riferisce a quell'insieme di tecnologie utilizzate per la realizzazione di oggetti partendo da modelli geometrici molto complicati, realizzando protitipi direttamente dal disegno CAD 3D. Le tecnologie RP sono state poi sviluppate per l'industria artigianale, nell'obiettivo di accelerare la produzione senza perdita di precisione nella costruzione. Tra queste tecniche sono sorte quelle di selective laser sintering. La sinterizzazione è il processo termico e meccanico per produrre materiali compattando sostanze in polvere, sotto una certa pressione o temperatura; più precisamente, nella sinterizzazione laser le polveri sono riscaldate per un tempo brevissimo. La fisica che descrive questo processo è piuttosto articolata, dato che la descrizione parte dall'assorbimento di radiazione laser e che comprenderà conduzione termica nella polvere, trasformazione di fase di un materiale eterogeneo, formazione di fase solida con diversi meccanismi di condensazione e lo sviluppo delle diverse microstrutture dell'acciaio. Il lavoro sperimentale che è stato svolto è la produzione di una polvere di acciaio e vanadio utilizzabile in solid state sintering, ma dato quanto detto, lo studio ha incluso una descrizione più generale del processo della sinterizzazione metallica da polveri. Nel corso del lavoro si è contribuito alla messa a punto della stampante 3D per sinterizzazione di polveri metalliche realizzata alla 3d4mec, soffermandosi nella ricerca dei parametri ottimali per la stampa di polvere StainlessSteel CX by EOS.
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Cruz, Fernando Manuel Martins. "Direct manufacture of hydroxyapatite based bone implants using selective laser sintering." Thesis, Bucks New University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408253.

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Taylor, Christopher Martin. "Direct laser sintering of stainless steel : thermal experiments and numerical modelling." Thesis, University of Leeds, 2004. http://etheses.whiterose.ac.uk/378/.

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SLS is a commercial solid freeform fabrication process. Layers of powder material are bonded by a laser beam to rapidly manufacture three dimensional freeform models. In this work, the direct SLS of room temperature single-phase steel powder beds is researched. Two approaches are adopted: - Experimental analysis of heat transfer in the process; - Numerical modelling of the process. Experimental work involves the use of analytical equations to calculate the thermal conductivity and laser energy absorptance of the SLS powder bed. Experiments take place in a range of representative situations. Two temperature measurement systems are used, requiring some custom-designed elements. Conductivity values in the range 0.07 to 0.25 W/(m. K) are found, dependent on atmospheric gas and powder particle size. Absorptance varies from 0.08 to 0.21, dependent on atmosphere and material type. Measurements are made to learn more about temperature variation in the bed with position and time. It is found that processed material melts and solidifies in under 4 seconds in studied cases. Numerical modelling involves developing and testing an existing Fortran model of the SLS process. A method is devised to visualise modelled parts in 3D. Preprocessing is simplified, and more status information is communicated during execution. The effect on modelled parts of changes made to the program are tested. The stability of part depth is improved. The nature of parts is categorised against input parameters. The area, relative density and morphology of manufactured and modelled single layer parts are compared. Manufactured scans are found to have a variable cross-sectional shape, whereas the cross-sectional shape of modelled scans does not change. Modelled parts are found to be significantly smaller than manufactured parts. Reasons for these two differences are suggested.
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Říčan, Daniel. "Návrh výroby tělesa plynového analyzátoru s využitím metody Direct Metal Laser Sintering." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229527.

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This master’s thesis deals with the possibility of manufacturing gas analyzer by Rapid Prototyping Technology and it with the method Direct Metal Laser Sintering. The theoretical part describes the current production of component in the Frentech Aerospace LLC and innovation with the DMSL method in the company Innomia Furthermore JSC. Then an analysis of the principle of single methods Rapid Prototyping, especially the method of Direct Metal Laser Sintering, is implemented. The aim of the experimental part is to compare the mechanical properties and material structures, conventional metallurgy and powder metallurgy. The thesis also contains a technical-economic evaluation comparing the manufacture of mechanical part by conventional and advanced additive technology.
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Chen, Tiebing. "Analysis and modeling of direct selective laser sintering of two-component metal powders." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/5818.

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Thesis (Ph.D.)--University of Missouri-Columbia, 2005.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (November 15, 2006) Vita. Includes bibliographical references.
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Das, Suman. "Direct selective laser sintering of high performance metals : machine design, process development and process control /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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Xu, Yangzi. "Corrosion Behavior of Direct Metal Laser Sintered Ti-6Al-4V for Orthopedic Applications." Digital WPI, 2017. https://digitalcommons.wpi.edu/etd-dissertations/282.

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Ti-6Al-4V alloy has been used as biomedical implants for decades because of its superior mechanical properties, good biocompatibility, lack of allergic problems and good corrosion resistance. It is widely used as the tibial components in total knee arthroplastry and hip cup in total hip replacement. However, the mechanical properties of Ti-6Al-4V implant can be deteriorated due to corrosion pits. In the past decades, the rapid developments in additive manufacturing have broadened their applications in biomedical area due to the high geometrical freedom in fabricating patient-friendly implants. However, the high-localized thermal input and fast cooling rate during laser processing usually result in non-equilibrium phase with high residual stress. Therefore, it is necessary to apply proper post-treatments on the as-printed parts to ensure better properties. In this work, various post-treatments (e.g. post-heat treatments, hot isostatic pressing) were applied aim to improve the corrosion behavior of direct metal laser sintered Ti-6Al-4V parts. The effect of post-treatment temperature on the mechanical properties and corrosion behavior were examined experimentally. A discussion on factors influencing corrosion rate was presented, and the corrosion mechanism on the Ti-6Al-4V part in simulated body fluid was proposed. Based on the electrochemical measurement results, enhanced corrosion resistance was observed in the samples after high temperature HIPing at the annealing temperature (α+β region) of 799°C.
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Coffy, Kevin. "Microstructure and Chemistry Evaluation of Direct Metal Laser Sintered 15-5 PH Stainless Steel." Master's thesis, University of Central Florida, 2014. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6256.

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15-5PH stainless steel is an important alloy in the aerospace, chemical, and nuclear industries for its high strength and corrosion resistance at high temperature. Thus, this material is a good candidate for processing development in the direct metal laser sintering (DMLS) branch of additive manufacturing. The chemistry and microstructure of this alloy processed via DMLS was compared to its conventionally cast counterpart through various heat treatments as part of a characterization effort. The investigation utilized optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-Ray diffractometry (XRD), energy dispersive X-Ray spectroscopy (EDS) and glow discharge atomic emission spectrometry (GDS) techniques. DMLS processed samples contained a layered microstructure in which the prior austenite grain sizes were relatively smaller than the cast and annealed prior austenite grain size. The largest of the quantifiable DMLS prior austenite grains had an ASTM grain size of approximately 11.5-12 (6.7?m to 5.6?m, respectively) and the cast and annealed prior austenite grain size was approximately 7-7.5 (31.8?m to 26.7?m, respectively), giving insight to the elevated mechanical properties of the DMLS processed alloy. During investigation, significant amounts of retained austenite phase were found in the DMLS processed samples and quantified by XRD analysis. Causes of this phase included high nitrogen content, absorbed during nitrogen gas atomization of the DMLS metal powder and from the DMLS build chamber nitrogen atmosphere. Nitrogen content was quantified by GDS for three samples. DMLS powder produced by nitrogen gas atomization had a nitrogen content of 0.11 wt%. A DMLS processed sample contained 0.08 wt% nitrogen, and a conventionally cast and annealed sample contained only 0.019 wt% nitrogen. In iron based alloys, nitrogen is a significant austenite promoter and reduced the martensite start and finish temperatures, rendering the standard heat treatments for the alloy ineffective in producing full transformation to martensite. Process improvements are proposed along with suggested future research.
M.S.M.E.
Masters
Materials Science Engineering
Engineering and Computer Science
Materials Science and Engineering
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Book chapters on the topic "Direct laser sintering"

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Xu, Yangzi, Kristin L. Sundberg, and Richard D. Sisson. "Corrosion Behavior of Ti6Al4V Fabricated by Direct Metal Laser Sintering." In Proceedings of the 13th World Conference on Titanium, 1501–5. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119296126.ch252.

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Zhu, H. H., L. Lu, and J. Y. H. Fuh. "Fabrication of Cu-Based Functional Parts by Direct Laser Sintering." In High Performance Metallic Materials for Cost Sensitive Applications, 203–10. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118788028.ch23.

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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." In Progress in Powder Metallurgy, 461–64. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-419-7.461.

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Zhu, H. H., J. Y. H. Fuh, and L. Lu. "Direct Laser Sintering of Cu-based Metallic Powder for Injection Moulding." In AMST’02 Advanced Manufacturing Systems and Technology, 779–84. Vienna: Springer Vienna, 2002. http://dx.doi.org/10.1007/978-3-7091-2555-7_90.

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Dolinsek, Slavko. "Direct Metal Laser Sintering Some Improvements of the Materials and Process." In THERMEC 2006, 2681–86. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-428-6.2681.

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Cader, Maciej, and Dominik Wyszyński. "Application of Direct Metal Laser Sintering for Manufacturing of Robotic Parts." In Recent Advances in Systems, Control and Information Technology, 312–26. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48923-0_36.

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Ye, Dongsen, Yingjie Zhang, Kunpeng Zhu, Geok Hong, and Jerry Ying. "Characterization of acoustic signals during a direct metal laser sintering process." In Advances in Energy Science and Equipment Engineering II, 1315–20. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315116174-89.

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Shakerin, Sajad, and Mohsen Mohammadi. "Hybrid Additive Manufacturing of MS1-H13 Steels via Direct Metal Laser Sintering." In TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings, 277–83. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36296-6_26.

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Samantaray, Mihir, Dhirendra Nath Thatoi, and Seshadev Sahoo. "An Approach to Numerical Modeling of Temperature Field in Direct Metal Laser Sintering." In Lecture Notes on Multidisciplinary Industrial Engineering, 295–314. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-96968-8_14.

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Choi, Jeongho. "Mechanical Characterization of Hyper-cubic Models Created with Direct Metal Laser Sintering Method." In Proceedings of the 11th International Conference on Porous Metals and Metallic Foams (MetFoam 2019), 59–68. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42798-6_6.

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Conference papers on the topic "Direct laser sintering"

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Utley, Eric. "Designing for 3D printing: direct metal laser sintering." In Laser 3D Manufacturing V, edited by Henry Helvajian, Alberto Piqué, and Bo Gu. SPIE, 2018. http://dx.doi.org/10.1117/12.2286673.

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Syvänen, T., O. Nyrhilä, J. Kotila, and J.-E. Lind. "Direct metal laser sintering of complex metal structures." In ICALEO® 2001: Proceedings of the Laser Materials Processing Conference and Laser Microfabrication Conference. Laser Institute of America, 2001. http://dx.doi.org/10.2351/1.5059928.

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Chandra Achinadka, Jagadish. "Study of Condensate Generated During Direct Metal Laser Sintering." In ASME 2017 Gas Turbine India Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gtindia2017-4900.

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DMLS (Direct Metal Laser Sintering), an additive manufacturing technology, is increasingly becoming popular to build intricate high quality functional parts & rapid prototypes. DMLS technology uses a high intensity laser to build components layer by layer, directly from metal powder. CAD data is directly converted to part without the need for tooling. It is possible to build internal features and passages that are not possible in conventional manufacturing routes. The process generates significant amount of condensate due to vaporization and suction applied to build chamber. Typically as much as 30% of the weight of powder ends up as condensate. The condensate so generated cannot be directly recycled. This results in significant reduction in profitability and process efficiency. This study pertains to 18% Ni Maraging Steel grade C300, which commonly used in DMLS process. Maraging Steel is used extensively to build functional parts by DMLS process especially for Tool and Die applications. In the present study chemistry, particle size distribution & morphology of the condensate was studied & compared with the powder. Parts were built using condensate and chemical, physical, mechanical, microstructure and XRD studies were done. These properties were compared with properties of parts built using fresh powder. No difficulty was encountered in building parts using condensate. However, hardness and tensile properties were found to be inferior, thus it is not possible to recycle the condensate directly. Present research investigates the cause of difference in these properties.
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Syvänen, T., Martin Heugel, and Robert Domröse. "Diode pumped fiber laser in direct metal laser sintering (DMLS) process." In ICALEO® 2004: 23rd International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2004. http://dx.doi.org/10.2351/1.5060229.

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Syvänen, T., O. Nyrhilä, J. Kotila, and J. E. Lind. "Direct metal laser sintering of very fine metal powders." In ICALEO® 2000: Proceedings of the Laser Materials Processing Conference. Laser Institute of America, 2000. http://dx.doi.org/10.2351/1.5059466.

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Coulon, Nadine, Yorris Lafaye, and Pascal Aubry. "Analysis of the laser sintering process for direct manufacturing of mould." In ICALEO® 2006: 25th International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2006. http://dx.doi.org/10.2351/1.5060791.

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Mordas, Genrik, Ada Steponavičiūtė, Aušra Selskienė, Jurijus Tretjakovas, and Sergejus Borodinas. "Direct Metal Laser Sintering of stainless steel alloy: microstructure and mechanical properties." In The 13th international scientific conference “Modern Building Materials, Structures and Techniques”. Vilnius Gediminas Technical University, 2019. http://dx.doi.org/10.3846/mbmst.2019.201.

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Additive manufacturing (AM) is a type of manufacturing technologies whereby the material is added a layer upon layer to produce a 3D object. Produced 3D parts are applied in such industry sectors as space, aviation, automotive, building and has excellent future promises. Ourdays, the commercialy promised technique for metal manufacturing is Direct Metal Laser Sintering (DMLS). Our study concentrated on the investigation of the mechanical properties of produced17-4H (stainless steel) parts using DMLS. The effect of the DMLS process parameters (laser power, scanning speed and energy density) on the ultimate strength, yield strength and Young’s modulus was determined. We showed an evolution of the microstructure. The detected defects were classified. This study allowed to determine the optimal regimes of DMLS for SS 17-4H and describe mechanical properties of the produced parts as well as helped to show future possibilities of DMLS development.
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Seyffert, Riley, and Sudhir Kaul. "Experimental Study of Direct Metal Laser Sintering: High Cycle Fatigue Life and Process Parameters." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23003.

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Abstract Direct Metal Laser Sintering (DMLS) is a relatively new manufacturing process in additive manufacturing (AM) that fuses powdered metal by using a high-powered laser. Although this process allows manufacturing prototypes without requiring specific tooling, it is challenging to use this process for manufacturing high volume production parts since complex shapes can take a significant amount of build time. Furthermore, manufactured parts also need some amount of post-processing to remove the support material that may be required due to the layer-by-layer build process. This study investigates three process parameters that could be optimized to substantially reduce production time. These three parameters are as follows: build layer thickness, laser scan speed, and laser hatch distance. In order to evaluate the influence of these parameters, manufactured parts made of AISI 316L Stainless Steel are tested for fatigue life and static strength. A three-point bending test is used as per ASTM E466. While none of the three parameters is seen to significantly influence ultimate tensile strength, results indicate that build layer thickness is a significant process parameter that directly affects fatigue life. Furthermore, the interaction between build layer thickness and laser scan speed is found to be statistically significant for high cycle fatigue. However, laser scan speed and laser hatch distance are seen to be statistically insignificant for fatigue life. The initial results of this study indicate that process parameters of DMLS need to be selected judiciously in order to minimize build time while maintaining structural integrity.
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Colvin, Jacob, Michael Carter, Jan Puszynski, and James Sears. "Laser sintering of silver nano-particle inks deposited by direct write technology." In ICALEO® 2005: 24th International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2005. http://dx.doi.org/10.2351/1.5060561.

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Boschetto, A., F. Veniali, and F. Miani. "Mass Finishing of Parts Produced by Direct Metal Laser Sintering." In ASME 7th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2004. http://dx.doi.org/10.1115/esda2004-58585.

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This paper presents some practical considerations on finishing of parts made by direct metal laser sintering (DMLS). The main process capabilities limitations of this promising rapid tooling technique are in fact in the surface roughness of the produced parts. This fact hinders the introduction of DMLS as a widely employed industrial process, especially for what concerns the production of moulds and inserts and allows their use only as preseries tools in injection moulding of plastics, since the requirements for preseries tools are worse than those needed during the process. Barrel finishing, in turn, is a well established technique to improve the roughness of parts of complicated shape by means of a soft mechanical action over the surface. The results herewith presented show that it is possible to achieve roughness of the order of 1 μm Ra even when starting from initial roughness of the order of 15 μm Ra, i.e. those typically attained by DMLS.
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Reports on the topic "Direct laser sintering"

1

List, III, Frederick Alyious, Ralph Barton Dinwiddie, Keith Carver, and Joy E. Gockel. Melt-Pool Temperature and Size Measurement During Direct Laser Sintering. Office of Scientific and Technical Information (OSTI), August 2017. http://dx.doi.org/10.2172/1399977.

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Bons, Jeffrey, Ali Ameri, James Gregory, and Arif Hossain. Revolutionizing Turbine Cooling with Micro-Architectures Enabled by Direct Metal Laser Sintering. Office of Scientific and Technical Information (OSTI), May 2020. http://dx.doi.org/10.2172/1630131.

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Tekalur, Arjun, Jacob Kallivayalil, Jason Carroll, Mike Killian, Benjamin Schultheis, Anil Chaudhary, Zackery McClelland, Jeffrey Allen, Jameson Shannon, and Robert Moser. Additive manufacturing of metallic materials with controlled microstructures : multiscale modeling of direct metal laser sintering and directed energy deposition. Engineer Research and Development Center (U.S.), July 2019. http://dx.doi.org/10.21079/11681/33481.

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