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Comportement d’aciers à transformation de phase austénite-martensite pour la simulation du grenaillage de précontrainte

Abstract : Shot-peening is commonly used in mechanical industries to increase life duration of mechanical and structural parts: residual compressive stresses are developed at the sub-surface of the material by plastic stretching of the surface. In the case of TRIP-effect steels (TRansformation Induced Plasticity), the metastable austenite can transform into martensite during shot-peening. The final distribution of stress is then more complex than for “standard steels” as it results from the mechanical strain imposed by the process and the martensitic transformation leading to a stress redistribution between austenite, martensite and the other phases. This work aims to characterize experimentally the mechanical state, at phase scale, of different TRIP steels (AISI 301LN, TRIP 780 and 23MnCrMo5) as well as the fraction of each phase after shot-peening and to propose a numerical model by finite elements which could be used in the future by engineering offices. An elastoplastic model with phase transformation was developed in this thesis which permits to predict the evolution of mechanical variables, macroscopically and at the phase scale, as well as the evolution of austenite volume fraction
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  • HAL Id : tel-01455203, version 1

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Romain Guiheux. Comportement d’aciers à transformation de phase austénite-martensite pour la simulation du grenaillage de précontrainte. Mécanique [physics.med-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2016. Français. ⟨NNT : 2016ENAM0055⟩. ⟨tel-01455203⟩

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