Relevant bibliographies by topics / DMLS

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

Academic literature on the topic 'DMLS'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "DMLS"

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Ranjan Pradhan, Smruti, Rupinder Singh, and Sukhwant Singh Banwait. "Comparison of DMLS and DMLS-waste assisted investment casting." Materials Letters 324 (October 2022): 132782. http://dx.doi.org/10.1016/j.matlet.2022.132782.

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Mangano, Francesco, Carlo Mangano, Adriano Piattelli, and Giovanna Iezzi. "Histological Evidence of the Osseointegration of Fractured Direct Metal Laser Sintering Implants Retrieved after 5 Years of Function." BioMed Research International 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/9732136.

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Background. Direct metal laser sintering (DMLS) is an additive manufacturing technique that allows the fabrication of dental implants layer by layer through the laser fusion of titanium microparticles. The surface of DMLS implants is characterized by a high open porosity with interconnected pores of different sizes; therefore, it has the potential to enhance and accelerate bone healing. To date, however, there are no histologic/histomorphometric studies in the literature evaluating the interface between bone and DMLS implants in the long-term. Purpose. To evaluate the interface between bone and DMLS implants retrieved after 5 years of functional loading. Methods. Two fractured DMLS implants were retrieved from the human jaws, using a 5 mm trephine bur. Both the implants were clinically stable and functioned regularly before fracture. The specimens were processed for histologic/histomorphometric evaluation; the bone-to-implant contact (BIC%) was calculated. Results. Compact, mature lamellar bone was found over most of the DMLS implants in close contact with the implant surface; the histomorphometric evaluation showed a mean BIC% of 66.1% (±4.5%). Conclusions. The present histologic/histomorphometric study showed that DMLS implants were well integrated in bone, after 5 years of loading, with the peri-implant bone undergoing continuous remodeling at the interface.
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Krishnan, Manickavasagam, Eleonora Atzeni, Riccardo Canali, Flaviana Calignano, Diego Manfredi, Elisa Paola Ambrosio, and Luca Iuliano. "On the effect of process parameters on properties of AlSi10Mg parts produced by DMLS." Rapid Prototyping Journal 20, no. 6 (October 20, 2014): 449–58. http://dx.doi.org/10.1108/rpj-03-2013-0028.

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Purpose – The aim of this research is to reach a deep understanding on the effect of the process parameters of Direct Metal Laser Sintering process (DMLS) on macroscopic properties (hardness and density) of AlSi10Mg parts and resulting microstructure. Design/methodology/approach – A full factorial design of experiment (DOE) was applied to determine the most significant process parameter influencing macroscopic properties of AlSi10Mg parts manufactured by DMLS process. The analysis aims to define the optimum process parameters and deduce the process window that provides better macroscopic properties of AlSi10Mg parts. Optical microscopy observations are carried out to link the microstructure to macroscopic properties. Findings – Macroscopic properties of DMLS parts are influenced by the change in process parameters. There is a close correlation between the geometry of scan tracks and macroscopic properties of AlSi10Mg parts manufactured by DMLS process. Originality/value – The knowledge of utilizing optimized process parameters is important to fabricate DMLS parts with better mechanical properties. The present research based on applying experimental design is the first analysis for AlSi10Mg parts produced in DMLS process.
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Śliwa, Romana Ewa, Jacek Bernaczek, and Grzegorz Budzik. "The Application of Direct Metal Laser Sintering (DMLS) of Titanium Alloy Powder in Fabricating Components of Aircraft Structures." Key Engineering Materials 687 (April 2016): 199–205. http://dx.doi.org/10.4028/www.scientific.net/kem.687.199.

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This study presents detailed characteristics of the DMLS method as used for titanium alloy powder with reference to a possible intended use in aeronautics applications.In the present study test models were made, designed for trials in which the model material properties are to be determined and which specify the basic features of the RP/DMLS technique. In order to evaluate the ultimate use of the DMLS technique in fabricating titanium alloy parts, the following procedures were conducted: tensile and upsetting tests for Ti6Al4V alloy samples (a comparative analysis for DMLS models and models fabricated, respectively, from titanium sheet and bar was carried out), an SEM analysis of the microstructure of the fragments of the surface of polished and etched samples, a Vickers hardness test and an analysis of the accuracy of the reproduction of the shape and roughness of the model fabricated in the DMLS procedure. A detailed analysis of the DMLS method significantly supplements the existing body of knowledge on innovative rapid prototyping techniques [1–4], and the results allow us to specify a group of aircraft structure components which may be fabricated using this method. Excellent strength properties of DMLS models and the possibility of improving surface quality by mechanical working enable the fabrication of advanced aircraft structure components operated in target conditions (under load).
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Konečná, Radomila, Ludvík Kunz, Pavel Pokorný, and Gianni Nicoletto. "Fatigue Crack Growth and Threshold Behavior of DMLS Ti6Al4V." Solid State Phenomena 267 (October 2017): 157–61. http://dx.doi.org/10.4028/www.scientific.net/ssp.267.157.

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Growth of long fatigue cracks in Ti6Al4V alloy manufactured by direct metal laser sintering (DMLS) was investigated. Two DMLS systems, EOSINT M270 and EOSINT M290, with different process parameters were used for production of CT specimens having three different orientations of crack propagation with respect to the DMLS build direction. The as-built specimens were stress relieved at 740 °C. The fatigue crack growth curve and the threshold values of the stress intensity factor for crack propagation were experimentally determined. It has been found that the chosen DMLS processing parameters and the used stress relieving procedure results in material exhibiting isotropic crack growth behavior, i.e. the crack growth was found to be independent of the DMLS build direction. The fatigue crack growth rates and the threshold values for the crack growth were compared with published results characterizing the as-built material and material after different post processing heat treatments.
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Walker, S. B. "The Defence Medical Library Service and Military Medicine." Journal of The Royal Naval Medical Service 91, no. 3 (December 2005): 170–76. http://dx.doi.org/10.1136/jrnms-91-170.

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AbstractThe Defence Medical Library Service (DMLS) supports the clinical practice and career development of military health professionals across the world. Clinical governance and the need for medical knowledge to be evidence-based means the DMLS has a central role to play in support of defence medicine. The DMLS is important for enabling health professionals to make sense of the evidence-based pyramid and the hierarchy of medical knowledge. The Royal Centre for Defence Medicine (RCDM) in Birmingham is recognised as an international centre of excellence. The information, knowledge and research requirements of the RCDM will provide opportunities for the DMLS to support and engage with the academic community.
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Raj, B. Anush, J. T. Winowlin Jappes, M. Adam Khan, V. Dillibabu, and N. Rajesh Jesudoss Hynes. "Studies on Mechanical Attrition and Surface Analysis on Heat-Treated Nickel Alloy Developed through Additive Manufacturing." Advances in Materials Science and Engineering 2022 (April 9, 2022): 1–8. http://dx.doi.org/10.1155/2022/4861346.

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In this paper, the nickel-based superalloy SU718 is developed through the Direct Metal Laser Sintering (DMLS), an additive manufacturing process. Further, the material has been focused to study the effect of heat treatment and abrasive particle erosion. Two different heat treatment (HT) cycles are planed with ageing and annealing to enrich the metallurgical quality of the DMLS processed SU718 alloy. The heat treatment is performed with two different combinations of temperatures for annealing/solutionizing followed by ageing to improve the metallurgical properties. The influence of heat treatment on additively manufactured IN718 is imparting variations in the hardness, microstructure, and erosion resistance. Vickers hardness for as built, HT 1, and HT 2 of DMLS alloy is 264.15, 385.55, and 352.43 Hv; which has been increased for 45% for HT 1 and 33% for HT 2 from the as built DMLS alloy. After solutionizing, the grains are refined within the track boundary and the majority of the grains are homogenized. The air jet erosion test arrangement is used to conduct the study at a velocity of 250 m/s and impact angle of 90° at room temperature. The hardness of the treated samples has taken vital role to resist the erosion. The rate of erosion is higher for bare DMLS alloy whereas HT 1 has low erosion rate when compared with HT 2 and bare DMLS alloy. The erosion morphology of the samples was carried out by SEM images, and erosion mechanism is discussed. The ploughing and microcutting were found in all the impact angles, whereas erodent impingement is found in the bare DMLS alloy in additional. The good erosion resistance is observed for HT 1 DMLS alloy in all the impact angles.
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Nicoletto, Gianni, Radomila Konečná, Ludvík Kunz, and Martin Frkáň. "Influence of as-built surface on fatigue strength and notch sensitivity of Ti6Al4V alloy produced by DMLS." MATEC Web of Conferences 165 (2018): 02002. http://dx.doi.org/10.1051/matecconf/201816502002.

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Direct Metal Laser Sintering (DMLS) is one of the additive manufacturing technologies involving a metal powder bed and a laser source to obtain components of complex geometry. The fatigue life of an as-built DMLS part is negatively influenced by the rough surface compared to a machined surface. Since most DMLS components are expected to have also stress concentrations, here the combined effect on fatigue of a as-built surface and a geometrical notch in as-built DMLS Ti6Al4V was investigated using a new test methodology. Miniature specimens having three different directions with respect to build direction were fabricated and tested determining the directional fatigue notch sensitivity of as-built DMLS Ti6Al4V Optical inspection of notch surface quality and roughness measurements demonstrated a ranking of the directional notches that inversely correlated to the measured fatigue performance. The link among the curved surface orientation, the peculiar layer-wise additive manufacturing fabrication and the fatigue notch sensitivity is clarified.
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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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Mangano, Carlo, Francesco Mangano, Jamil Shibli, Leandro Roth, Gianmaria d’ Addazio, Adriano Piattelli, and Giovanna Iezzi. "Immunohistochemical Evaluation of Peri-Implant Soft Tissues around Machined and Direct Metal Laser Sintered (DMLS) Healing Abutments in Humans." International Journal of Environmental Research and Public Health 15, no. 8 (July 30, 2018): 1611. http://dx.doi.org/10.3390/ijerph15081611.

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Background: Direct metal laser Sintering (DMLS) is an additive manufacturing technique that allows fabrication of dental implants and related components with a highly porous surface. To date, no human studies have investigated the soft tissue adhesion and presence of inflammatory infiltrate with porous DMLS healing abutments (HAs), nor have they compared these with the classic machined ones. Purpose: To evaluate the degree of cell adhesion (integrin expression) and the quantity/quality of inflammatory infiltrate, on HAs with different surfaces; full DMLS, full machined, and hybrid (half DMLS and half machined). Methods: Fifty implant patients were randomly assigned to receive one of these different Has: T1, full DMLS (11 subjects); T2, machined in the upper portion and DMLS in the lower one (10 subjects); T3, DMLS in the upper portion and machined in the lower one (19 subjects); T4, full machined (10 patients). Thirty days after placement, circular sections of soft tissues around HAs were retrieved for immunohistochemical evaluation. Results: With regard to the adhesion molecules, the samples showed different intensity of integrin expression, with a statistically significant difference (p < 0.001) between T1 and the other groups. All the samples were positive for the different clusters related to the inflammatory infiltrate (T lymphocytes, CD3; B lymphocytes, CD20; and macrophages, CD68), but a lower infiltrate was found in T1, with statistically significant differences (p < 0.001) among the groups. Conclusions: The HA surface seems to influence the degree of cell adhesion and the inflammatory infiltrate of the surrounding soft tissues.
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Dissertations / Theses on the topic "DMLS"

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Jack, William Josiah. "A Six Sigma Approach to Implementing Conformal Cooling on Existing Processes in Injection Molding." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2214.

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Injection molding is one of the most common methods of mass production. After injecting molten plastic into a mold, the heat must leave the plastic material, enter the mold steel, enter the coolant, and exit the mold. This heat flow is critical to producing high quality parts rapidly. As plastic cools, the plastic shrinks. Uneven cooling causes uneven shrinkage which can cause the part to warp from the resulting internal stresses or create sink marks on the part. Thus the effect of uneven cooling is lower part quality, both in appearance and in dimension. Standard or conventional cooling channels are straight-drilled holes arranged such that they intersect and connect to form a loop for coolant, typically water, to flow through. This allows the mold to act as a heat exchanger, transferring heat to the coolant and carrying heated coolant away from the mold. While standard cooling channels have been used widely in the injection molding industry for their manufacturability and proven results, other methods have been developed for creating molds with cooling channels of any desired path or shape. These channels, called conformal due to how they conform to the shape of the part, provide uniform cooling, eliminate or reduce the quality issues of warpage and shrinkage, and provide faster, more economical cycle times. Conformal cooling is cannot be produced only by subtractive manufacturing methods that remove material from raw stock but rather through additive or hybrid manufacturing techniques that add material in layers of powder, sections, or sheets. Bonded sheet layer mold inserts can be made of any size and are currently the only feasible way of making large, conformally-cooled molds. Presented is a Six Sigma approach for implementing conformal cooling in existing molds to achieve the benefits of higher part quality and fast cycle times. Feasibility considerations include existing mold features such as slides and ejectors, choice of channel diameter, and the cooling channel path. Cost justification considerations include assessing part quality cost impact through calculation of the costs of poor quality and assessing machine capacity as relates to cycle time. With the approach presented, an injection molding company should be able to assess feasibility and cost effectiveness of implementing conformal cooling on its molds.
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Mordenti, Eugenio. "Comportamento a fatica dell’acciaio Maraging MS1 prodotto tramite DMLS: influenza della posizione nella camera." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16511/.

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L’obiettivo principale di questo studio è caratterizzare dei provini, prodotti mediante additive manufacturing, con il metodo DMLS (direct metal laser sintering), a fatica mediante prove di flessione rotante. I provini sono realizzati in Maraging steel, le cui caratteristiche meccaniche e composizione sono di seguito enunciate. I dati sperimentali ottenuti dalle prove vengono poi elaborati tramite la normativa ISO 12107-2012, per trovare la curva di fatica S-N, sia usando un’interpolazione lineare, che una quadratica, per confrontarle in modo da identificare quale metodologia approssima meglio i dati. E' inoltre utilizzata la normativa Dixon tramite uno stair-caise per trovare la tensione limite di fatica. Un altro aspetto rilevante di questo elaborato è quello di analizzare il processo produttivo dei provini per capire quali sono i principali parametri che influenzano l’additive manufacturing e che conseguenze hanno sulla vita a fatica dei componenti realizzati. Per questo studio sono stati utilizzati tre set di provini (ogni set ha numerosità pari a 12) numerati dal 20 al 22. I set vengono trattati termicamente, lavorati alle macchine utensili, pallinati e sono analizzati nel dettaglio i processi appena citati. Legato a questi studi c’è il tentativo di trovare una correlazione tra la posizione di realizzazione dei provini in camera e la vita a fatica. Infine si esegue un’analisi frattografica per capire meglio i meccanismi di innesco e propagazione delle cricche per fatica.
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Ramosoeu, Makhabo Khabiso Ellen. "Characterisation and static behaviour of the DMLS Ti-6AI-4V for Bio-medical applications." Thesis, Bloemfontein: Central University of Technology, Free State, 2015. http://hdl.handle.net/11462/275.

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Thesis (M. Tech. (Engineering: Mechanical)) -- Central University of Technology, Free State,
The Centre for Rapid Prototyping and Manufacturing (CRPM) at the Central University of Technology, Free State (CUT) manufactures implants using Electro Optical Systems (EOS) titanium Ti-6Al-4V alloy powder (further referred to as EOS Ti64 powder) by means of Direct Metal Laser Sintering (DMLS) process on the EOSINT M 270 machine. For this reason, there is a need to characterise and acquire knowledge of the basic properties of direct metal laser sintered EOS titanium Ti-6Al-4V alloy samples (further referred to as DMLS Ti64 samples) under static tensile loading in order to provide the CRPM with engineering design data. The first objective of this Master’s study is to acquire the characteristics of EOS Ti64 powder in order to ascertain its suitability in the DMLS process. Secondly, the study aims to assess tensile properties and elastic constants of DMLS Ti64 samples produced from the set process parameters of EOSINT M 270 machine. Thirdly, it is to investigate microstructures of DMLS Ti64 samples subjected to different heat treatment techniques which will eventually assist in the determination of a suitable heat treatment technique that will yield higher ductility. Finally, the study aims to validate the static behaviour of DMLS Ti64 samples subjected to the static tensile loading up to a yield point in order to determine failure due to yielding. The samples were manufactured at CRPM Bloemfontein. The metallographic examinations, heat treatment and the determination of mechanical properties were done at the CSIR in Pretoria. Optical Microscope (OM) and Scanning Electron Microscope (SEM) were used to determine microstructures of DMLS Ti64 samples while Energy Dispersive X-Ray (EDX) analyses were performed using SEM. The samples were heat treated at temperatures of 700, 1000 and 1100°C respectively, and subsequently either cooled with the furnace, air or were water quenched. The mechanical property tests included tensile, hardness and determination of elastic constants. The static behaviour of DMLS Ti64 samples under static tensile load up to a yield point was predicted and verified using ABAQUSTM Finite Element Analysis (FEA). The stress-strain curves from ABAQUSTM were interpreted using MDSolid program. The point of interest was Von Mises yield stress at 0.2% offset, in order to determine failure due to yielding. EOS Ti64 powder particles were spherical in shape and the alpha and alpha+beta phases were identified. As-laser sintered samples possess a very fine and uniform alpha case with islands of martensitic plates; samples were brittle and showed low levels of ductility with an average elongation of 2.6% and an area reduction of 3.51%. Ultrasonic test results showed that DMLS Ti64 samples have Young’s modulus of 115 GPa, Shear modulus of 43 GP, a bulk modulus of 109 GPa and Poisson’s ratio of 0,323 while the density was 4.4 g/cm3. Slow cooling of DMLS Ti64 samples from 1000 and 1100oC resulted in a microstructure constituted more by the alpha phase of lower hardness than those from 700oC and as-laser sintered samples. High hardness was obtained by water quenching. The water quenched samples showed martensitic transformation and high hardness when compared to furnace cooled samples. Beta annealing tailored a microstructure of as-laser sintered samples into a lamellar structure with different lath sizes as per cooling rate. Beta annealing improved ductility levels up to 12.67% elongation for samples furnace cooled for 4 hours and even higher to 18.11% for samples furnace cooled for 34 hours, while area reduction increased to 25.94% and 33.39%, respectively. Beta annealing conversely reduced yield strength by 19.89% and ultimate tensile strength was reduced by 23.66%. The calculated maximum Von Mises stresses found were similar to the FEA interpreted results. The average percentage error, without the stress concentration factor, was approximately 8.29%; with the stress concentration factor included, it was 0.07%. The small reaction forces induced in both x-axis and z-axis contributed to this error of 0.07% between the calculations and ABAQUSTM FEA results. Samples that were not heat treated fell outside the Von Mises criterion and failed due to yielding. This justified the brittleness found in the tensile test results where elongation and area reduction were 2.6% and 3.51% respectively. However, all samples that were heat treated fell within the Von Mises criterion. The objectives of this study were achieved; the mechanical properties were similar to those of standard specification for wrought annealed Ti-6Al-4V alloy for surgical implant applications and EOS GmbH manufacturer’s material data sheet. DMLS Ti64 samples must be beta annealed in order to attain higher levels of ductility. A recommendation was made to further investigate the effect of heat treatment on the other mechanical properties. Furthermore, detailed results of basic properties of DMLS Ti64 samples are provided in the appendices in chart format and were written on a CD disc.
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Jaime, Gustavo Carneiro. "Análise comparativa da resistência à corrosão eletroquímica da liga de Ti-6Al-4V e do aço inoxidável AISI316L obtidas por manufatura aditiva visando aplicações biomédicas /." Ilha Solteira, 2017. http://hdl.handle.net/11449/152091.

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Orientador: Ruis Camargo Tokimatsu
Resumo: A procura por materiais, com compatibilidade e funcionalidade biológicas, que possam melhorar a qualidade da vida humana é constante, além da busca de processos de fabricação que atendam às necessidades de manufatura de artefatos de geometria complexa. Os artefatos de aço inoxidável são utilizados por possuírem uma boa biocompatibilidade, baixo custo de produção, mas podem liberar íons como o cobalto, que é carcinogênico. O uso de Ligas de titânio é uma boa alternativa, já que possuem uma maior resistência à corrosão e boa resposta biológica, porém, seu custo é muito elevado. Considerando esses aspectos, o presente trabalho foi realizado buscando estudar, comparativamente, as características de microdureza, microdesgaste e resistência à corrosão de artefatos manufaturados para aplicações biomédicas, aproveitando as características mecânicas da liga de aço inoxidável AISI316L, usado como substrato, com as características eletroquímicas apresentadas pela liga de titânio Ti-6Al-4V, usado como material de tratamento de superfície. A sinterização direta dos metais por laser (DMLS) foi o processo de manufatura escolhido por apresentar as características de fabricação desejadas. Os ensaios realizados foram o de microdureza Vickers, ensaio de desgaste microadesivo por esfera rotativa fixa (esfera-fixa) e para o comparativo da resistência à corrosão eletroquímica foram produzidas curvas de polarização potenciodinâmicas que forneceram os seguintes parâmetros: o potencial de corrosão, a... (Resumo completo, clicar acesso eletrônico abaixo)
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Capelli, Alessandro. "Effetto della posizione in camera sulla resistenza a fatica dell'acciaio Maraging MS1 prodotto tramite DMLS." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17419/.

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La tecnologia Direct Metal Laser Sintering (DMLS) è una delle più promettenti tra tutti i processi che possono essere raggruppati sotto la definizione di Additive Manufacturing, permettendo la realizzazione di componenti anche molto complessi in breve tempo, a partire da un disegno CAD 3D. In questo studio sono stati realizzati dei provini in acciaio Maraging MS1, fornito dall’azienda EOS sotto forma di polvere, i quali sono stati suddivisi in tre serie in base alla loro posizione nella camera di produzione rispetto al flusso di gas inerte che vi scorre all’interno. I provini sono stati sottoposti ad una precisa serie di trattamenti termici e meccanici, quindi testati a fatica in una macchina per flessione rotante secondo una precisa metodologia sperimentale. I dati raccolti sono stati processati con il metodo Dixon e la norma internazionale ISO 12107 per ricavare il limite di fatica e le relative bande di confidenza. Utilizzando l’ANOVA, si è poi eseguita una comparazione dei dati sperimentali ottenuti con i tre set, non evidenziando significative differenze. L’analisi frattografica delle superfici di frattura ha permesso infine di analizzare più a fondo l’origine e la propagazione delle cricche e stabilire le cause più frequenti che hanno originato la rottura.
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Righini, Nicola. "Prove di fatica a flessione rotante su provini in acciaio inossidabile PH1 ottenuti tramite DMLS." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Dalla metà degli anni Ottanta si è assistito all'introduzione dell'Additive Manufacturing (AM), tecnologia completamente innovativa che permette la produzione di componenti a partire da un modello 3D realizzato tramite specifici software. La definizione di AM raggruppa svariati processi, tra cui il DMLS (Direct Metal Laser Sintering), che prevede di formare il pezzo a partire da polvere metallica, successivamente fusa da un raggio laser e lasciata solidificare, così da ottenere la geometria definitiva. In questo elaborato è stato analizzato come alcuni parametri di processo, in particolare la rugosità e il trattamento termico, influenzino la vita a fatica del componente, ossia il numero di cicli che esso può compiere sopportando un carico al di sotto di quello di snervamento senza giungere a rottura. Per effettuare lo studio sono state svolte prove di fatica a flessione rotante, attenendosi alla procedura descritta in specifiche normative ISO. Esse prevedono di vincolare dei provini cilindrici di diametro fissato, dei quali sono state rilevate preventivamente le caratteristiche geometriche e superficiali, su un apposito macchinario in grado di metterli in rotazione, ed attendere l'esito della prova, che può essere una sopravvivenza, se il pezzo supera un numero prestabilito di cicli di vita, o una rottura, nel qual caso è stata osservata la superficie di frattura. Il risultato finale dello studio, conseguito tramite successiva elaborazione statistica dei dati ottenuti dalle prove, è la curva di fatica del materiale, che correla la tensione a cui esso è sottoposto ai cicli di vita che può compiere senza rompersi. Nell'ambito di questa specifica indagine, sono state confrontate le curve di fatica relative a provini realizzati tramite DMLS e in seguito sottoposti a differenti trattamenti meccanici (pallinatura, lavorazione alle macchine utensili) e che hanno subito o meno trattamento termico, così da valutare l'effettivo beneficio dei diversi processi produttivi.
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Sekerka, Vít. "Výroba dílů technologií DMLS a jejich porovnání s jinými konvenčními technologiemi z hlediska ekonomické náročnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229969.

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This diploma thesis presents a technology based on the gradual smelting of fine layers of metal powder by using a laser beam. It explains and describes basic terminology related to the Rapid Prototyping technology, its division and practical usage. A part of the thesis is also the fabrication of several prototype parts by Direct Metal Laser Sintering including the economical comparison of their fabrication with other conventional technologies.
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Ghirardi, Lorenzo. "Comportamento a fatica di provini in acciaio inossidabile realizzati tramite DMLS con diverse direzioni di accrescimento." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10665/.

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Si tratta di una tesi svolta su diverse tipologie di provini ottenuti per Direct Metal Laser Sintering. Questi campioni sono stati provati a fatica, precisamente a flessione rotante. Per determinarne il limite di fatica è stato utilizzato il metodo Dixon. Una volta stimato questo valore sono stati svolti degli attacchi chimici per verificare la presenza di cricche e porosità. Infine, per controllare le caratteristiche descritte inizialmente dalla letteratura del materiale, sono stati sottoposti ad una prova di durezza Rockwell.
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Ravaioli, Irma. "Resistenza a fatica di pezzi in acciaio realizzati per DMLS a seconda di diversi parametri costruttivi." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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Scopo della ricerca è stato quello di studiare la resistenza a fatica di provini in maraging steel (MS1) e in stainless steel (PH1), realizzati mediante processo DMLS, in funzione di due parametri: direzione di accrescimento e forma finale del provino (ovvero sovrametallo asportato mediante macchine utensili).
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Piraccini, Giorgio. "Prove sperimentali di fatica a flessione rotante su provini in acciaio inossidabile PH1 ottenuti per DMLS." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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L’avvento dell’Additive Manufacturing e la sua sempre maggiore flessibilità, resa possibile dallo sviluppo tecnologico, sta suscitando l’interesse dei progettisti i quali sempre più spesso ne considerano l’impiego per la realizzazione di componenti particolarmente complessi e/o difficilmente ottenibili tramite tecnologie tradizionali di asportazione di truciolo. Oltre ai componenti sottoposti a carichi statici, il cui comportamento è valutabile tramite FEM (Finite Element Method), è ricorsivo l’impiego di membri meccanici in regimi di tensione alterna che ne comportano un carico a fatica; la valutabilità di tutti i fattori in gioco risulta dunque fondamentale per la realizzazione di componenti opportunamente dimensionati e capaci di lavorare in condizioni più specifiche e gravose. In particolare, l’interesse dell’elaborato è rivolto verso l’impatto di rugosità superficiale e trattamento termico sul comportamento a fatica del materiale, considerando provini cilindrici a sezione variabile realizzati in acciaio inossidabile PH1 e sottoposti a flessione rotante. L’analisi di ciascun provino ne comprende la rilevazione di caratteristiche geometriche e costruttive, nonché l’osservazione dei provini giunti a rottura per comprendere cause ed effetti di quest’ultima. Per ultima si esegue l’elaborazione dei dati ottenuti in seguito alla prova di fatica ed ottenimento delle relative curve di fatica a seguito di opportune valutazioni statistiche.
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Books on the topic "DMLS"

1

Marsden, C. J. DMUs. London: Ian Allan, 1986.

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Service, Direct Mail Information, ed. DMIS factbook. London: Direct Mail Information Service, 1995.

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Rawat, Nand Kishore, and David Kerr, eds. Data Monitoring Committees (DMCs). Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-28760-2.

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McCully, Emily Arnold. Gran dmas trick-or-treat. New York: HarperCollins Publishers, 2001.

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R, Kramer Thomas, National Institute of Standards and Technology (U.S.), and Catholic University of America, eds. The NIST DMIS interpreter, version 2. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1998.

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Supertex. Databook: [integrated circuits and DMOS transistors]. Sunnyvale, Calif: Supertex Inc., 1991.

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University of Manchester. Regional Computer Centre., ed. SIR version 2.2 DMBS reference manual. Manchester: UMRCC, 1991.

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Gosselin, Mark S. DMS: Diagnostic Modeling System. Vicksburg, Miss: U.S. Army Corps of Engineers, Engineer Research and Development Center, 1999.

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Brillet, Jean Louis. Le modèle Micro-DMS. Paris: République française, Institut national de la statistiques et des études économiques, Direction générale, 1994.

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Robinson, Jennifer. DMS SuperNode system description. [Ottawa, Ont.?]: BNR, Software Development Technology, 1988.

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Book chapters on the topic "DMLS"

1

N'Dri, N., H. W. Mindt, B. Shula, M. Megahed, A. Peralta, P. Kantzos, and J. Neumann. "DMLS Process Modelling & Validation." In TMS2015 Supplemental Proceedings, 389–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093466.ch49.

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N’Dri, N., H. W. Mindt, B. Shula, M. Megahed, A. Peralta, P. Kantzos, and J. Neumann. "DMLS Process Modelling and Validation." In TMS 2015 144th Annual Meeting & Exhibition, 389–96. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48127-2_49.

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Varun, A., and G. Saravana Kumar. "DMLS Support Structure Optimization Using Homogenized Model Distortion Prediction." In Lecture Notes in Mechanical Engineering, 391–97. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3938-9_40.

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Apparao, D., and M. V. Jagannadha Raju. "Experimental Investigation on Maraging Steel Metal Deposition Using DMLS Process." In Learning and Analytics in Intelligent Systems, 721–30. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-24314-2_85.

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Sahoo, Ashok Kumar, Seshadev Sahoo, and Virendra Patel. "Simulation of AlSi10Mg Powder for Temperature Profile by DMLS Method." In Lecture Notes in Mechanical Engineering, 681–88. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9057-0_73.

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Frkáň, Martin, Gianni Nicoletto, and Radomila Konečná. "As-Built Sharp Notch Geometry and Fatigue Performance of DMLS Ti6Al4V." In Structural Integrity, 75–81. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13980-3_10.

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Rafieazad, Mehran, Mohsen Mohammadi, Adrian Gerlich, and Ali Nasiri. "Impacts of Friction Stir Processing on Microstructure and Corrosion Properties of DMLS-AlSi10Mg." In TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings, 239–48. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36296-6_22.

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Rajesh, R., Mithun V. Kulkarni, P. Sampathkumaran, P. Sathish, and S. Sreenivas. "Comparison of GRA and TOPSIS Optimization Techniques in DMLS-Processed Bronze–Nickel Samples." In Lecture Notes in Mechanical Engineering, 143–59. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2278-6_13.

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Bogojević, Nebojša, Snežana Ćirić-Kostić, Aleksandar Vranić, Giorgio Olmi, and Dario Croccolo. "Influence of the Orientation of Steel Parts Produced by DMLS on the Fatigue Behaviour." In Lecture Notes in Mechanical Engineering, 294–305. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-46212-3_22.

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Shah, R. K., and P. P. Dey. "Mechanical Properties, Microstructural and Surface Topography Evaluation of AlSi10Mg Alloy Produced by DMLS Process." In Lecture Notes in Mechanical Engineering, 15–26. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3266-3_2.

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Conference papers on the topic "DMLS"

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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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Grewal, G., G. Kaushal, and B. Krishan. "Direct Metal Laser Sintering (DMLS) Technique for Prospective Wear Related Applications." In ITSC2017, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p1013.

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Abstract Direct Metal Laser Sintering (DMLS) technique is one of the technologies which is generally used to built prototypes and tooling applications. DMLS uses powder bed fusion to bond particles together by laser energy. A new powder layer is spread on top of the previous layers and the process is repeated up to required shape of part can be produced. This review paper presents development, current status and challenges of the DMLS technique with emphasises on material processed by DMLS and is aimed to understand influence of density, microstructure, micro-hardness, tensile strength and wear behaviour of built-up parts. It also highlights the process through proofs based on classical results in terms of advantages and applications.
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Stimpson, Curtis K., Jacob C. Snyder, Karen A. Thole, and Dominic Mongillo. "Roughness Effects on Flow and Heat Transfer for Additively Manufactured Channels." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43940.

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Recent technological advances in the field of additive manufacturing (AM), particularly with direct metal laser sintering (DMLS), have increased the potential for building gas turbine components with AM. Using DMLS for turbine components broadens the design space and allows for increasingly small and complex geometries to be fabricated with little increase in time or cost. Challenges arise when attempting to evaluate the advantages of DMLS for specific applications, particularly because of how little is known regarding the effects of surface roughness. This paper presents pressure drop and heat transfer results of flow through small, as produced channels that have been manufactured using DMLS in an effort to better understand roughness. Ten different coupons made with DMLS all having multiple rectangular channels were evaluated in this study. Measurements were collected at various flow conditions and reduced to a friction factor and a Nusselt number. Results showed significant augmentation of these parameters compared to smooth channels, particularly with the friction factor for mini-channels with small hydraulic diameters. However, augmentation of Nusselt number did not increase proportionally with the augmentation of the friction factor.
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Zhou, Zichuan, Kari Clark, Ashish Verma, Yasuhiro Matsui, and Zhixin Liu. "Optical Clock Synchronization for O-band Directly Modulated Laser Based Data Center Interconnection." In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/ofc.2023.m3e.5.

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We show that clock synchronized transmission has reduced receiver-side jitter that limits DMLs’ performance compared to conventional clock and data recovery. We access transmission quality using 35-GHz-bandwidth DMLs at 1271 and 1373 nm.
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Somanatha Panicker, Sujith, and Dheepa Srinivasan. "Oxidation Coatings on Additively Manufactured CoCrMo." In ASME 2017 Gas Turbine India Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gtindia2017-4613.

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Additive manufacturing (AM) via the direct metal laser sintering (DMLS) route is a new technology for both new make and repair application in gas turbine hot gas path components. This paper presents the development of a new oxidation coating Ceral 10 as a protective coating on the AM CoCrMo alloys. A high Al activity slurry aluminide coating (Ceral 10) was deposited on the DMLS CoCrMo. The coating produced on DMLS CoCrMo was uniform and intact having a thickness of ∼ 80–100 μm. The slurry aluminide coating showed an Inward diffusion with the DMLS CoCrMo substrate having an Al of 38–40 wt% and Si (12–13 wt%) after the diffusion heat treatment. The interface with the substrate was gradual in terms of chemistry with an interdiffusion zone of 15–20 μm. The Ceral10 coating showed limited oxidation up to 1038°C (1000 h) and at 1066°C (after 500 h), coating spallation occurred. The distinct thermally grown oxide between the coating-substrate interface led to the spallation. The effectiveness of the Ceral 10 coating to protect the DMLS CoCrMo alloy at high temperatures is evaluated via detailed microstructural characterization.
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ZETTEL, D. "Process-dependent material characteristicsof dmls-manufactured specimens." In Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-8.

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Abstract. Direct metal laser sintering is a 3D-printing technology involving a multitude of physical phenomena requiring the fine-tuning of multiple parameters (e.g., laser power, layer thickness) to achieve satisfying fabrication results [1]. Modifying each of these parameters can significantly influence the resulting material characteristics of the fabricated parts [2]. This work investigates the impact of the modification of the process parameters on the material characteristics of hardened aluminum specimens. A design of experiments was used to fabricate 85 aluminum specimens using 17 printing parameter sets. The specimens’ dimensional accuracy, surface roughness, hardness, density, porosity, and thermal conductivity were investigated. Standardized, as well as self-designed test setups were used for this purpose. Furthermore, porosity measurements and microstructural investigations were performed using scanning electron microscopy and reflected light microscopy.
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Snyder, Jacob C., Curtis K. Stimpson, Karen A. Thole, and Dominic Mongillo. "Build Direction Effects on Additively Manufactured Channels." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43935.

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With the advances of Direct Metal Laser Sintering (DMLS), also generically referred to as additive manufacturing, novel geometric features of internal channels for gas turbine cooling can be achieved beyond those features using traditional manufacturing techniques. There are many variables, however, in the DMLS process that affect the final quality of the part. Of most interest to gas turbine heat transfer designers are the roughness levels and tolerance levels that can be held for the internal channels. This study investigates the effect of DMLS build direction and channel shape on the pressure loss and heat transfer measurements of small scale channels. Results indicate that differences in pressure loss occur between the test cases with differing channel shapes and build directions, while little change is measured in heat transfer performance.
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Chandrasekara, Santhosh Kumar Rao, Anigani Sudarshan Reddy, Dheepa Srinivasan, and Durga Ananthanarayanan. "Study of Process Parameter and Powder Variability on the Properties and Recrystallization Behavior of Direct Metal Laser Sintered CoCrMo." In ASME 2017 Gas Turbine India Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gtindia2017-4614.

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Additive manufacturing via the direct metal laser sintering (DMLS) route is an attractive technology for repair and refurbishment of gas turbine components. This paper presents the study of the role of various process parameters such as laser power, scan speed, layer thickness and powder variability in obtaining dense, pore-free parts of CoCrMo using the DMLS route. The variation in surface roughness of the built samples and the effect of powder variability on the part density were brought out via a systematic design of experiments (DOE). Different solution heat treatments were carried out to establish the recrystallization behavior of DMLS CoCrMo. The variation in microstructure and properties were evaluated between powders from two different sources, EOS and Praxair, as an important aspect towards practical applicability of the process for components.
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Jahan, Suchana, and Hazim El-Mounayri. "Game Theoretic Modelling Approach for Optimizing Direct Metal Laser Sintering Process Parameters Using Artificial Neural Network." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23504.

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Abstract Additive Manufacturing, also known as Rapid Prototyping and 3D Printing is a three-dimensional fabrication process, executed by adding materials in layers. Among many different classes of AM processes, Direct Metal Laser Sintering is a widely used metal part manufacturing method. The design, planning and implementation of overall DMLS process and its process parameters are yet to be optimized. To be able to render minimum defects as well as higher quantity of production, it is essential to apply ever developing computer technologies, data storage capabilities and optimization techniques. Typically, the defects on any 3D printed part can alter mechanical properties and shorten its durability. To minimize the defects and produce good quality parts at a mass level, has been a challenge in additive manufacturing industry. In this paper, a framework is presented to utilize game theoretic modelling approach to optimize DMLS process parameters. Online monitoring of DMLS process can identify defects of printed layers and correlate them with temperature signatures. An Artificial Neural Network is trained to predict printing defects and process parameters. predicted model can be further used in a game theoretic playoff matrix to identify the most optimal combination or configuration of DMLS process parameters to minimize defects and maximize the production quantity. The proposed method can also be applied in different domains of additive and advanced manufacturing.
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Gallant, Lucas, Amy Hsiao, and Grant McSorley. "Benchmarking of print properties and microstructures of 316L stainless steel DMLS prints." In HT2021. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.ht2021p0037.

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Abstract Direct metal laser sintering (DMLS) is an established technology in metal additive manufacturing. This complex manufacturing process yields unique as-built material properties that influence mechanical performance and vary with different machine parameters. Part porosity and residual stresses, which lead to part failures, and grain structure, as it relates to mechanical properties and anisotropy of DMLS parts, require investigation for different print settings. This work presents results for density, residual stress, and microstructural inspections on designed test artifacts for the benchmarking of 3D metal printers. Results from printing artifacts on two separate DMLS printer models with default parameters show highly dense parts for both printers, with relative densities above 99.5%. Characterization of residual stress through cantilevered deflection specimens indicates similar resulting thermal stresses developed in both build processes, with deflection averages of 32.48% and 28.09% for the respective machines. Additionally, properties of the test artifact printed after adjusting default machine parameters for equal energy density are characterized.
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Reports on the topic "DMLS"

1

Taylor, Samantha. ProX 200 DMLS Process Space Exploration. Office of Scientific and Technical Information (OSTI), August 2018. http://dx.doi.org/10.2172/1467546.

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Watkins, Thomas R., Kinga A. Unocic, Philip J. Maziasz, Jeffrey R. Bunn, Christopher M. Fancher, Alonso Peralta, Suresh Sundarraj, and James Neumann. Residual stress determination of direct metal laser sintered (DMLS) inconel specimens and parts. Office of Scientific and Technical Information (OSTI), January 2018. http://dx.doi.org/10.2172/1415913.

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Kramer, Thomas R., Frederick M. Proctor, William G. Rippey, and Harry Scott. The NIST DMIS interpreter. Gaithersburg, MD: National Institute of Standards and Technology, 1997. http://dx.doi.org/10.6028/nist.ir.6012.

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Kramer, Thomas R., and John Horst. Users manual for version 2.1.5 of the NIST DMIS test suite (for DMIS 5.1). Gaithersburg, MD: National Institute of Standards and Technology, 2009. http://dx.doi.org/10.6028/nist.ir.7603.

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Kramer, Thomas R., and John Horst. Maintainers manual for version 2.2.1 of the NIST DMIS test suite (for DMIS 5.2). Gaithersburg, MD: National Institute of Standards and Technology, 2010. http://dx.doi.org/10.6028/nist.ir.7720.

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Kramer, Thomas R., and John Horst. Users manual for version 2.2.1 of the NIST DMIS test suite (for DMIS 5.2). Gaithersburg, MD: National Institute of Standards and Technology, 2010. http://dx.doi.org/10.6028/nist.ir.7735.

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Kramer, Thomas R., and John Horst. System builders manual for version 2.1.5 of the NIST DMIS test suite (for DMIS 5.1). Gaithersburg, MD: National Institute of Standards and Technology, 2009. http://dx.doi.org/10.6028/nist.ir.7610.

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Kramer, Thomas R., and John Horst. System builders manual for version 2.2.1 of the NIST DMIS test suite (for DMIS 5.2). Gaithersburg, MD: National Institute of Standards and Technology, 2010. http://dx.doi.org/10.6028/nist.ir.7715.

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Kramer, Thomas R., Frederick M. Proctor, William G. Rippey, and Harry Scott. The NIST DMIS interpreter, version 2. Gaithersburg, MD: National Institute of Standards and Technology, 1998. http://dx.doi.org/10.6028/nist.ir.6252.

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Craig, Kenneth R., Mark S. Gosselin, Daryl S. Cook, and Thad C. Pratt. DMS: Diagnostic Modeling System. Report 3. DMS Data Manager - A User's Guide. Fort Belvoir, VA: Defense Technical Information Center, September 2001. http://dx.doi.org/10.21236/ada397613.

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