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Anisotropie de propagation de fissure de fatigue dans le superalliage INCONEL 718 élaboré par fabrication additive

Abstract : Additive manufacturing (AM), and in particular Selective Laser Melting (SLM), is a mature process for certain materials, including certain low-loaded Ni-based superalloys, target materials for the aeronautical industry. The characterizations of mechanical properties for AM parts are most often used from tensile properties, while for many applications, it is fatigue which will allow a part to be dimensioned. It has thus been shown that these materials exhibit anisotropic behavior. The objective of this thesis is to analyse the anisotropy of fatigue crack propagation. First, we chose two manufacturing conditions which give us two distinct microstructures. Hardening tests have enabled us to identify anisotropic behavior for these two configurations. We completed this study by analysing the anisotropy of fatigue crack growth rate and crack paths. Fatigue crack growth tests make it possible to clearly establish the role of microstructure heterogeneities. Numerical simulation of these tests allow a quantification of needed crack growth energy in an highly anisotropic material.
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Submitted on : Monday, March 28, 2022 - 10:11:28 AM
Last modification on : Wednesday, March 30, 2022 - 3:23:51 AM
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  • HAL Id : tel-03621286, version 1

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Mélanie Prost. Anisotropie de propagation de fissure de fatigue dans le superalliage INCONEL 718 élaboré par fabrication additive. Mécanique des matériaux [physics.class-ph]. Université Paris sciences et lettres, 2021. Français. ⟨NNT : 2021UPSLM050⟩. ⟨tel-03621286⟩

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