Contribution à la modélisation des transformations de phases dans les alliages de titanes : application à l'alliage [beta]-CEZ

Abstract : In order to predict the phase transformation kinetics and the amount of alpha phase of the different morphologies, it is thus necessary to model each transformation mechanism. The developped model describing transformation kinetics by nucleation and growth laws for a multi-component titanium alloy. A new description of alpha phase compound (stoechiométric compound) in the existing titanium data base in the software Thermo-Calc allows to obtain a good correlation between experimental and calculated results. In order to study the growth of alpha spheroids after solutionnizing in the alpha+beta range we have shown that it is necessary to consider a numerical approach to obtain a good prediction of the transformation kinetics. The transformation kinetics after solutionnizing in the beta range is obtained by combining the models of nucleation and growth of the different morphologies. A geometrical structure was assumed, close to the real grain one. This allows to estimate some microstructural parameters that can be compared to the experimental observations. Experimental and calculated IT (and CGT) diagrams appear to be very close.
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_2004_HERICHER_L.pdf
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https://hal.univ-lorraine.fr/tel-01750032
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Submitted on : Thursday, March 29, 2018 - 12:36:17 PM
Last modification on : Monday, April 16, 2018 - 10:41:05 AM

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Ludovic Héricher. Contribution à la modélisation des transformations de phases dans les alliages de titanes : application à l'alliage [beta]-CEZ. Autre [cond-mat.other]. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL011N⟩. ⟨tel-01750032⟩

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