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Caractérisation et modélisation des structures de solidification en soudage TIG d’alliages austénitiques

Abstract : Today, industrials want to upgrade their welding numerical simulation knowledge’s in order to be able to guarantee the welded structure integrity. Solidification is the main step of welding process. As soon as the grain selection in welded region is well reproduced by simulation software, mechanical properties and nondestructive test response can be deduced. This work tries to find thermometallurgical phenomena in order to describe the microstructures formation during welding. These mechanisms are used for validating a new solidification model which realizes a thermal calcul post-treatment with a cellular automaton (CAFE_WELD). In this aim, welding experiences were done and characterized with EBSD. These analyses allow following the grain selection into the weld. The refusion effect is clearly seen in the case of multi-pass weld. These results are completed by the fine solidification characterizations on filler metal employed in welding experiences. In this way, the model implementation can be done in order to do numerical simulation of the same experiences. The comparisons between real and numerical experiences show that the physical laws taken into account in CAFE_WELD model are not sufficient to reproduce the microstructural properties occurring in welding
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  • HAL Id : tel-01725764, version 1

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Thomas Billotte. Caractérisation et modélisation des structures de solidification en soudage TIG d’alliages austénitiques. Matériaux. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0084⟩. ⟨tel-01725764⟩

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