Solidification des aciers ternaires : modélisation de la microségrégation en croissance dendritique colonnaire, prise en compte de la réaction péritectique

Abstract : A new microsegregation model has been developed to be coupled to the macroscopic code SOLID. The purpose of this study is to describe macrosegregation in ingots more accurately by taking into account the nature of the phases formed during solidification and the thermodynamic equilibriums between them. So, the model has been coupled to the software Thermo-Calc and the peritectic transformation has been studied. The theoretical analysis of the results given by the model has allowed to understand some original cumulated microsegregation profiles during the peritectic growth. The micro-macro code resulting from the coupling of this model to SOLID has been tested on industrial ingots: the results show that the peritectic transformation can soften the macrosegregation severity in certain zones of the ingot and modeling the whole history of microsegregation is required to obtain the local cumulated profiles at the end of solidification.
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Ludovic Thuinet. Solidification des aciers ternaires : modélisation de la microségrégation en croissance dendritique colonnaire, prise en compte de la réaction péritectique. Autre [cond-mat.other]. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL057N⟩. ⟨tel-01749776⟩

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