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Theses

Fusion sélective par laser de lits de poudre : Étude sur le recyclage de la poudre et détection de défauts au cours de la fabrication par imagerie thermique

Abstract : Direct and additive manufacturing regroups several new technologies that are very different from conventional manufacturing processes such as casting. Aeronautic and space industries are really interested in those new processes such as the selective laser melting of metallic powder beds know as the SLM process. This PhD thesis report will show the issues of additive manufacturing and will describe some processes. A bibliography study has been done on two aeronautical alloys used in this work: titanium alloy TA6V and nickel-based superalloy Nimonic 263. This work also presents powder characterization (granulometry, morphology chemical composition) for the gas atomized powder. Besides, study has been done on the recyclability of the TA6V powder for the SLM process, for the powder itself and the mechanical properties of parts built from recycled powder. Moreover, this works deals with a powder bed consolidation model to estimate the productivity of the process. Then, a parametric and thermal study has been done on the Nimonic 263. The coaxial system for thermal visualization is described such as the image processing algorithm used. Finally, this reports deals with the study of thermal signature of typical SLM defects.
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https://pastel.archives-ouvertes.fr/tel-03117437
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Submitted on : Thursday, January 21, 2021 - 10:58:10 AM
Last modification on : Saturday, January 23, 2021 - 3:25:34 AM

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2015ENMP0068_archivage.pdf
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  • HAL Id : tel-03117437, version 1

Citation

Pierre Vinson. Fusion sélective par laser de lits de poudre : Étude sur le recyclage de la poudre et détection de défauts au cours de la fabrication par imagerie thermique. Matériaux. Ecole Nationale Supérieure des Mines de Paris, 2015. Français. ⟨NNT : 2015ENMP0068⟩. ⟨tel-03117437⟩

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