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Dissertations / Theses on the topic 'Additive laser manufacturing'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Mikler, Calvin. "Laser Additive Manufacturing of Magnetic Materials." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011873/.

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A matrix of variably processed Fe-30at%Ni was deposited with variations in laser travel speeds as well and laser powers. A complete shift in phase stability occurred as a function of varying laser travel speed. At slow travel speeds, the microstructure was dominated by a columnar fcc phase. Intermediate travel speeds yielded a mixed microstructure comprised of both the columnar fcc and a martensite-like bcc phase. At the fastest travel speed, the microstructure was dominated by the bcc phase. This shift in phase stability subsequently affected the magnetic properties, specifically saturation m

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2

Hong, Zhihan, and Rongguang Liang. "IR-laser assisted additive freeform optics manufacturing." NATURE PUBLISHING GROUP, 2017. http://hdl.handle.net/10150/625522.

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Computer-controlled additive manufacturing (AM) processes, also known as three-dimensional (3D) printing, create 3D objects by the successive adding of a material or materials. While there have been tremendous developments in AM, the 3D printing of optics is lagging due to the limits in materials and tight requirements for optical applicaitons. We propose a new precision additive freeform optics manufacturing (AFOM) method using an pulsed infrared (IR) laser. Compared to ultraviolet (UV) curable materials, thermally curable optical silicones have a number of advantages, such as strong UV stabi

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3

Lee, Yousub. "Simulation of Laser Additive Manufacturing and its Applications." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1440360229.

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4

Ranjan, Rajit. "Design for Manufacturing and Topology Optimization in Additive Manufacturing." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439307951.

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5

Markusson, Lisa. "Powder Characterization for Additive Manufacturing Processes." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62683.

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The aim of this master thesis project was to statistically correlate various powder characteristics to the quality of additively manufactured parts. An additional goal of this project was to find a potential second source supplier of powder for GKN Aerospace Sweden in Trollhättan. Five Inconel® alloy 718 powders from four individual powder suppliers have been analyzed in this project regarding powder characteristics such as: morphology, porosity, size distribution, flowability and bulk properties. One powder out of the five, Powder C, is currently used in production at GKN and functions as a r

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6

Jones, Jason Blair. "Investigation of laser printing for 3D printing and additive manufacturing." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/59733/.

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Additive Manufacturing (AM), popularly called “3D printing,” has benefited from many two-dimensional (2D) printing technology developments, but has yet to fully exploit the potential of digital printing techniques. The very essence of AM is accurately forming individual layers and laminating them together. One of the best commercially proven methods for forming complex powder layers is laser printing, which has yet to be used to directly print three-dimensional (3D) objects above the microscale, despite significant endeavour. The core discovery of this PhD is that the electrostatic charge on t

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7

Syed, Waheed Ul Haq. "Combined wire and powder deposition for laser direct metal additive manufacturing." Thesis, University of Manchester, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556499.

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8

Juhasz, Michael J. "In and Ex-Situ Process Development in Laser-Based Additive Manufacturing." Youngstown State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ysu15870552278358.

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9

Foster, Moira. "Defect Detection in Selective Laser Melting." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1874.

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Additively manufactured parts produced using selective laser melting (SLM) are prone to defects created during the build process due to part shrinkage while cooling. Currently defects are found only after the part is removed from the printer. To determine whether cracks can be detected before a print is completed, this project developed print parameters to print a test coupon with inherent defects – warpage and cracking. Data recorded during the build was then characterized to determine when the defects occurred. The test coupon was printed using two sets of print parameters developed to contr

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10

Evans, Rachel Elizabeth. "Thermal Modeling of Coordinated Multi-Beam Additive Manufacturing." Wright State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=wright1588784900451923.

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11

Roberts, Ibiye Aseibichin. "Investigation of residual stresses in the laser melting of metal powders in additive layer manufacturing." Thesis, University of Wolverhampton, 2012. http://hdl.handle.net/2436/254913.

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Laser Melting (LM) is an Additive Layer Manufacturing (ALM) process used to produce three-dimensional parts from metal powders by fusing the material in a layerby- layer manner controlled by a CAD model. During LM, rapid temperature cycles and steep temperature gradients occur in the scanned layers. Temperature gradients induce thermal stresses which remain in the part upon completion of the process (i.e. residual stresses). These residual stresses can be detrimental to the functionality and structural integrity of the built parts. The work presented in this thesis developed a finite element m

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12

Hussein, Ahmed Yussuf. "The development of lightweight cellular structures for metal additive manufacturing." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/15023.

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Metal Additive Manufacturing (AM) technologies in particular powder bed fusion processes such as Selective Laser Melting (SLM) and Direct Metal Laser Sintering (DMLS) are capable of producing a fully-dense metal components directly from computer-aided design (CAD) model without the need of tooling. This unique capability offered by metal AM has allowed the manufacture of inter-connected lattice structures from metallic materials for different applications including, medical implants and aerospace lightweight components. Despite the many promising design freedoms, metal AM still faces some majo

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13

Gee, Kaitlyn Elizabeth. "Numerical tools for rate-cost-quality analysis of laser-based additive manufacturing." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127160.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, May, 2020<br>Cataloged from the official PDF of thesis.<br>Includes bibliographical references (pages 81-84).<br>AM expands the design space in an unprecedented manner, as it can allow complex internal geometries, support multiple materials or structural gradients, significantly reduce lead times for small-batch production, and enable mass customization [1]. However, the adoption of AM in industry is hindered by our lack of design knowledge and inability to navigate the myriad considerations required to

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14

McCarthy, David Lee. "Creating Complex Hollow Metal Geometries Using Additive Manufacturing and Metal Plating." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/43530.

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Additive manufacturing introduces a new design paradigm that allows the fabrication of geometrically complex parts that cannot be produced by traditional manufacturing and assembly methods. Using a cellular heat exchanger as a motivational example, this thesis investigates the creation of a hybrid manufacturing approach that combines selective laser sintering with an electroforming process to produce complex, hollow, metal geometries. The developed process uses electroless nickel plating on laser sintered parts that then undergo a flash burnout procedure to remove the polymer, leaving a comple

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15

Kumara, Chamara. "Microstructure Modelling of Additive Manufacturing of Alloy 718." Licentiate thesis, Högskolan Väst, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-13197.

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In recent years, additive manufacturing (AM) of Alloy 718 has received increasing interest in the field of manufacturing engineering owing to its attractive features compared to those of conventional manufacturing methods. The ability to produce complicated geometries, low cost of retooling, and control of the microstructure are some of the advantages of the AM process over traditional manufacturing methods. Nevertheless, during the building process, the build material undergoes complex thermal conditions owing to the inherent nature of the process. This results in phase transformation from li

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16

Francis, Zachary Ryan. "The Effects of Laser and Electron Beam Spot Size in Additive Manufacturing Processes." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/909.

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In this work, melt pool size in process mapped in power-velocity space for multiple processes and alloys. In the electron beam wire feed and laser powder feed processes, melt pool dimensions are then related to microstructure in the Ti-6Al-4V alloy. In the electron beam wire feed process, work by previous authors that related prior beta grain size to melt pool area is extended and a control scheme is suggested. In the laser powder feed process, in situ thermal imaging is used to monitor melt pool length. Real time melt pool length measurements are used in feedback control to manipulate the res

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Burkhardt, Irmela [Verfasser]. "Dissimilar titanium and titanium aluminide joints manufactured by laser beam welding and laser additive manufacturing / Irmela Burkhardt." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2021. http://d-nb.info/1224966562/34.

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Dyer, Brooke Renee. "Additive Manufacturing of Copper Electrodes and Bus Work for Resistance Welding." Youngstown State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1495803338676301.

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19

Hagedorn, Yves-Christian [Verfasser]. "Additive manufacturing of high performance oxide ceramics via selective laser melting / Yves-Christian Hagedorn." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/1051487862/34.

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20

Gibbs, Jonathan Sutton. "Testbeds for quality and porosity control in metal additive manufacturing by selective laser melting." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120394.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 277-283).<br>Selective laser melting (SLM) is a metal additive manufacturing process that can achieve high local density and near-net shape geometric accuracy. The dynamics of the meltpool and stability of the melt track upon cooling are critical to the microstructure, porosity, and final properties of the solidified material. Recent studies are replete with optimization of SLM scan parameters, yet there is nee

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21

Everton, Sarah. "Ensuring the quality of components produced by metal additive manufacturing using laser generated ultrasound." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/51651/.

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Laser powder bed fusion offers many advantages over conventional manufacturing methods, such as the integration of multiple parts which can result in significant weight-savings. The increased design freedom that layer-wise manufacture allows has also been seen to enhance component performance at little or no added cost. However, for such benefits to be realised, the material quality must first be assured. Laser ultrasonic testing is a non-contact inspection technique which has been proposed as suitable for in-situ monitoring of metal additive manufacturing processes. The thesis presented here

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22

Montgomery, Colt James. "The Effect of Alloys, Powder, and Overhanging Geometries in Laser Powder Bed Additive Manufacturing." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/1112.

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Additive manufacturing (AM) shows great promise for the manufacturing of next-generation engineering structures by enabling the production of engineered cellular structures, overhangs, and reducing waste. Melt-pool geometry prediction and control is critical for widespread implementation of laser powder bed processes due to speed and accuracy requirements. The process mapping approach used in previous work for different alloys and additive manufacturing processes is applied to the selective laser powder bed process for IN625 and 17-4 stainless steel alloys. The ability to predict the resulting

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Fan, Zongyue. "A Lagrangian Meshfree Simulation Framework for Additive Manufacturing of Metals." Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1619737226226133.

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Segerstark, Andreas. "Additive Manufacturing using Alloy 718 Powder : Influence of Laser Metal Deposition Process Parameters on Microstructural Characteristics." Licentiate thesis, Högskolan Väst, Avd för tillverkningsprocesser, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-8796.

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Additive manufacturing (AM) is a general name used for production methodswhich have the capabilities of producing components directly from 3D computeraided design (CAD) data by adding material layer-by-layer until a final component is achieved. Included here are powder bed technologies, laminated object manufacturing and deposition technologies. The latter technology is used in this study.Laser metal deposition using powder as an additive (LMD-p) is an AM processwhich uses a multi-axis computer numerical control (CNC) machine or robot toguide the laser beam and powder nozzle over the depositio

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Crisanti, Roberto. "Laser Direct Energy Deposition per la manifattura additiva: caratterizzazione del processo e prove sperimentali." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Studio condotto presso il Dipartimento di Ingegneria Industriale dell’Università di Bologna su un processo di Laser Direct Energy Deposition, o Laser Cladding, e sulla sua caratterizzazione, avente come fine ultimo quello di realizzare pezzi massicci a base rettangolare dotati di una morfologia esterna regolare e al contempo privi di difetti macroscopici all’interno, quali porosità o zone con mancata fusione del materiale d’apporto. Nella prima parte dello studio sono stati presi in esame i principali parametri di processo, ovvero la potenza della sorgente laser e la portata di polvere, e l’in

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26

Galy, Cassiopee. "Etude des interactions matériau/procédé en vue d'une optimisation des conditions opératoires du procédé de fabrication additive SLM sur des alliages d'aluminium pour des applications aéronautiques." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0106/document.

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La fusion laser sélective d’un lit de poudres (Selective Laser Melting – SLM) connait un véritable essor depuis quelques années,notamment en ce qui concerne la production de pièces métalliques. La faible densité des alliages d’aluminium, conjuguée à l’optimisation de conception rendue possible grâce aux procédés de fabrication additive, assure un gain de masse des structures conséquent, ce qui intéresse fortement les industriels des domaines automobile et aéronautique. Cependant, les propriétés finales des pièces aluminium fabriquées par SLM dépendent des nombreux défauts sont générés lors de

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Perini, Matteo. "Additive manufacturing for repairing: from damage identification and modeling to DLD processing." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/268434.

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The arrival on the market of a new kind of CNC machines which can both add and remove material to an object paved the way to a new approach to the problem of repairing damaged components. The additive operation is performed by a Direct Laser Deposition (DLD) tool, while the subtractive one is a machining task. Up to now, repair operations have been carried out manually and for this reason they are errors prone, costly and time consuming. Refurbishment can extend the life of a component, saving raw materials and resources. For these reasons, using a precise and repeatable CNC machine to repair

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Bajaj, Priyanshu Verfasser], Dierk [Akademischer Betreuer] Raabe, and Robert [Akademischer Betreuer] [Svendsen. "Precipitation during intrinsic heat treatment in laser additive manufacturing / Priyanshu Bajaj ; Dierk Raabe, Bob Svendsen." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1231118016/34.

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29

Harvey, Andrew J. "Correlating In-Situ Monitoring Data with Internal Defects in Laser Powder Bed Fusion Additive Manufacturing." Wright State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=wright1598887463083866.

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30

Sjöström, Julia. "Linkage of Macro- and Micro-scale Modelling Tools for Additive Manufacturing." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-283603.

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Additive manufacturing methods for steel are competing against commercial production in an increasing pace. The geometry freedom together with the high strength and toughness due to extreme cooling rates make this method viable to use for high-performance components. The desirable material properties originate from the ultrafine grain structures. The production is often followed by a post hardening heat treatment to induce precipitation of other phases. The printing process does however bring several challenges such as cracking, pore formation, inclusions, residual stresses and distortions. It

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Maidin, Shajahan. "Development of a design feature database to support design for additive manufacturing (DfAM)." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/9111.

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This research introduces a method to aid the design of products or parts to be made using Additive Manufacturing (AM), particularly the laser sintering (LS) system. The research began with a literature review that encompassed the subjects of design and AM and through this the need for an assistive design approach for AM was identified. Undertaking the literature review also confirmed that little has been done in the area of supporting the design of AM parts or products. Preliminary investigations were conducted to identify the design factors to consider for AM. Two preliminary investigations w

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Piazza, Gianluigi. "Studio microstrutturale e tribologico di leghe leggere prodotte mediante additive manufacturing." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22593/.

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In questo lavoro è stato valutato il comportamento tribologico di leghe prodotte mediante i più diffusi processi di Powder Bed Fusion: SLM (Selective Laser Melting) ed EBM (Electron Beam Melting). Nella prima parte è stata studiata l’influenza di processi di anodizzazione innovativi come PEO (Plasma Electrolytic Oxidation) ed ECO (ElectroChemical Oxidation) sulla lega di alluminio A357 prodotta mediante SLM con due diverse combinazioni di parametri di processo volte ad ottimizzare rispettivamente, la microstruttura (M) e la produttività (P). Nella seconda parte è stato studiato il comportament

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Berglund, Lina, Filip Ivarsson, and Marcus Rostmark. "Crucial Parameters for Additive Manufacturing of Metals : A Study in Quality Improvement." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254785.

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Production by Additive Manufacturing creates opportunities to make customized products in small batches with less material than in traditional manufacturing. It is more sustainable and suitable for niche products, but entails new production demands to ensure quality. The goal of this study is to define the most crucial parameters when creating Additive Manufactured products in metal and suggest tools for quality improvement. This is done by analysing earlier studies and evaluating the standard production procedures for manufacturing by Selective Laser Melting. The results from this study state

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Hasting, William. "Geometric Effects of Free-Floating Technique on Alloy 718 Parts Produced via Laser-Powder Bed Fusion." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613751580039925.

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Kusuma, Chandrakanth. "The Effect of Laser Power and Scan Speed on Melt Pool Characteristics of Pure Titanium and Ti-6Al-4V alloy for Selective Laser Melting." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1464271345.

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Jiba, Zetu. "Coating processes towards selective laser sintering of energetic material composites." Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/79246.

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This research aims to contribute to the safe methodology for additive manufacturing (AM) of energetic materials. Coating formulation processes were investigated to find a suitable method that may enable selective laser sintering (SLS) as the safe method for fabrication of high explosive (HE) compositions. For safety and convenience reasons, the concept demonstration was conducted using inert explosive simulants with properties quasi-similar to the real HE. Coating processes for simulant RDX-based microparticles by means of PCL and 3,4,5- trimethoxybenzaldehyde (as TNT simulant) are reported. T

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Ponzoni, Greta. "Additive Manufacturing della lega di alluminio A357(AlSi7Mg0.6): ottimizzazione del trattamento termico." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Campioni in lega di alluminio A357 (AlSi7Mg0.6) prodotti con tecnologia additiva Selective Laser Melting sono stati sottoposti a trattamento termico di invecchiamento o di ricottura di distensione. I trattamenti termici applicati a diverse temperature permettono di tracciare le curve di invecchiamento della lega misurando la durezza del materiale ad intervalli di tempo prefissati. Il valore di peak-aged, 135 HV, ottenuto nel caso di campioni invecchiati a 170°C per 1h evidenzia un incremento percentuale superiore al 13% e al 68% rispetto alla condizione as-built ed as-cast, rispettivamente. Pa

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Andreau, Olivier. "Nocivité en fatigue et contrôle de défauts produits par fabrication additive." Thesis, Paris, ENSAM, 2019. http://www.theses.fr/2019ENAM0037.

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Le procédé de fusion laser sélective de lit de poudre, également appelé SLM, permet de fabriquer des pièces métalliques en fusionnant des couches de poudre. Cette méthode novatrice donne accès à un large éventail de pièces aux géométries complexes, permettant notamment d’alléger les structures. Toutefois, la bonne tenue mécanique de ce type de pièces, en particulier dans le domaine de la fatigue, reste un enjeu industriel majeur. Les pièces élaborées par SLM peuvent en effet contenir des pores (débouchants ou internes) pouvant détériorer leurs propriétés mécaniques. Les travaux réalisés ont po

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Garibaldi, Michele. "Laser additive manufacturing of soft magnetic cores for rotating electrical machinery : materials development and part design." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52326/.

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This research work addresses the application of Additive Manufacturing (AM) technologies in novel electrical machinery. The unrivalled design freedom offered by AM has the potential to revolutionise the way rotating electrical motors are designed and manufactured. The thesis investigates the possibility offered by AM to advance the design of electrical machines for lightweight and high performance, with potential in several industrial sectors, including automotive and aerospace. In particular, we investigate how the performance of electrical motors can be improved by manufacturing the soft mag

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Vincent, Timothy John. "Computational Modeling and Simulation of Thermal-Fluid Flow and Topology Formation in Laser Metal Additive Manufacturing." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1512398718245784.

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Pote, Timothy Ryan. "Optical Measurements of High-Viscosity Materials Using Variations of Laser Intensity Incident on a Semi-Rigid Vessel for use in Additive Manufacturing." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/79595.

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Additive manufacturing is a growing field dominated by printing processes that soften and re-solidify material, depositing this material layer by layer to form the printed shape. Increasingly, researchers are pursuing new materials to enable fabrication of a wider variety of associated capabilities. This includes fabrication with high-viscosity materials of many new classes of material compositions, such as doping for magnetic or electrically conducting polymers. These additives complicate the materials deposition process by requiring complex, non-linear calibration to synchronize these new ca

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Walker, Joseph R. "Multi-Sensor Approach to Determine the Effect of Geometry on Microstructure in Additive Manufacturing." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1558900598369986.

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Taheri, Andani Mohsen. "Modeling, Simulation, Additive Manufacturing, and Experimental Evaluation of Solid and Porous NiTi." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1438888243.

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Narra, Sneha Prabha. "Melt Pool Geometry and Microstructure Control Across Alloys in Metal Based Additive Manufacturing Processes." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/914.

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There is growing interest in using additive manufacturing for various alloy systems and industrial applications. However, existing process development and part qualification techniques, both involve extensive experimentation-based procedures which are expensive and time-consuming. Recent developments in understanding the process control show promise toward the efforts to address these challenges. The current research uses the process mapping approach to achieve control of melt pool geometry and microstructure in different alloy systems, in addition to location specific control of microstructur

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Limousin, Maxime. "Développement d’inserts de moule pour l’injection plastique en acier inoxydable martensitique et en verre métallique massif produits par Laser Beam Melting (LBM)." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEE003.

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Cette thèse a pour but d’augmenter la durée de vie des moules pour l’injection plastique. Les principaux phénomènes à refréner sont l’usure par abrasion et l’usure par corrosion. Pour ce faire, deux familles de matériaux ont été présélectionnées. Il s’agit des aciers à outils inoxydables et des verres métalliques massifs. Ces travaux détaillent donc la sélection, le développement et la caractérisation d’une nuance pour chacune de ces familles. In fine, cette thèse délivre un nouvel acier adapté à la fabrication additive et aux moules d’injection plastique, allant de l’élaboration de la poudre

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Ng, Priscilla, Priscilla Ng, and Priscilla Ng. "Simulating Particle Packing During Powder Spreading For Selective Laser Melted Additive Manufacturing Using The Discrete Element Method In Abaqus." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2162.

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Metal additive manufacturing allows for the rapid production of complex parts that are otherwise impractical using conventional subtractive manufacturing techniques. Applications for additive manufacturing span across a broad array of industries including aerospace, automotive, and medical, among many others. One metric of printing success is material properties, including part density. While there has been extensive research completed for the density of printed parts, there is little published work concerning powder packing density on the build plate associated with powder spreading. In this

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Zhu, Yi, Lei Zhou, Lei Zhang, Cong Zhao, Zimu Wang, and Huayong Yang. "Assessment of friction loss to horizontally built fluid passages using additive manufacturing." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71081.

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Selective laser melting (SLM), is a type of additive manufacturing, which selectively melts a pre-spread layer of metal powders and produce a part by a layer-on-layer manner. SLM has demonstrated a great potential to reduce size and weight in hydraulic manifolds. However, a theoretical base is lacking since friction loss is unclear in a SLMed fluid passage. In this study, various fluid passages without supports, from diameters from 4 mm to 16 mm, were produced horizontally using SLM. The profile was measured using a 3D scanner and surface roughness was measured using a confocal laser scanning

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Pouzet, Sébastien. "Fabrication additive de composites à matrice titane par fusion laser de poudre projetée." Thesis, Paris, ENSAM, 2015. http://www.theses.fr/2015ENAM0051/document.

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Les composites à matrice titane (CMTi) sont des matériaux attractifs pour des applications aéronautiques, en raison de leurs performances mécaniques à haute température et de leur faible densité. La difficulté d’usiner ce type de matériaux rend les procédés de fabrication additive intéressants pour la fabrication de pièces complexes en trois dimensions. Cette étude porte sur l'élaboration de composites à matrice titane par le procédé de fabrication additive par fusion laser de poudre projetée. Dans un premier temps, différents types de poudres- renfort et de préparations de poudre ont été util

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Gunenthiram, Valérie. "Compréhension de la formation de porosités en fabrication additive (LBM). Analyse expérimentale de l’interaction laser – lit de poudre – bain liquide." Thesis, Paris, ENSAM, 2018. http://www.theses.fr/2018ENAM0028/document.

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Le procédé de fusion sélective « lit de poudre » (SLM) permet d'élaborer des pièces métalliques bonne matière (denses) directement à partir de la fusion de couches de poudres successives. De nombreux problèmes techniques doivent encore être surmontés pour faire du SLM un processus de fabrication entièrement viable. C'est le cas de l’état de surface et de l'apparition systématique de porosités, qui nécessitent des étapes de post-traitements. Jusqu'à présent, l'origine de la porosité reste incertaine mais est supposée être liée à la stabilité du procédé. Cette thèse propose une étude originale d

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Huang, Zhida. "SIMULATION OF METAL GRAIN GROWTH IN LASER POWDER BED FUSION PROCESS USING PHASE FIELD THERMAL COUPLED MODEL." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1554391043588225.

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