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Fabrication additive par dépôt laser direct de TA6V : étude expérimentale dans des régimes de forte productivité, modèles de comportement et recyclage de la poudre

Abstract : Additive manufacturing, also known as 3D printing, aggregates several processes that allows to build parts by stacking layers of a given material, directly from CAD models, without specific tools. Over the past decade, additive processes have gained in notoriety much more rapidly than their industrial applications gained in profitability.Indeed, these technologies must still mature, especially for metallic applications. This is the challenge of the project FUI-9 FALAFEL, in which this thesis takes place, carried out in partnership with several industrial and academic actors. It aims to accompany the development of the direct laser deposition process (DLD), also known as laser metal deposition (LMD).This consists in projecting and melting metal powder on a substrate in a defined pattern, layer by layer. It allows to obtain large size and low complexity parts with high roughness and a proper productivity, despite being still insufficient for industrialization.The specificity of the present work is to study the DLD process in operating modes that allow to reach high build rates (> 100 cc/h), in application to the titanium alloy TA6V.This work is driven by two research focus. In the first place, we try to improve the understanding and control of the process by establishing the relationships between operating parameters, geometric criteria, melt pool stability, process efficiency and generated microstructure.In a second stage, we focus on the possibility to reuse powders that remain unmelted after deposition. Up to 3 levels of powder recycling are studied, without dilution with new powder. We then carried out tests to check that the mechanical properties were in accordance with the aeronautical requirements.
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Submitted on : Thursday, June 30, 2022 - 12:46:15 PM
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  • HAL Id : tel-03709972, version 1

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Toinou Blanc. Fabrication additive par dépôt laser direct de TA6V : étude expérimentale dans des régimes de forte productivité, modèles de comportement et recyclage de la poudre. Matériaux. Université Paris sciences et lettres, 2017. Français. ⟨NNT : 2017PSLEM047⟩. ⟨tel-03709972⟩

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