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Textures, microstructures et propriétés mécaniques d'alliages de zinc en feuillards et en revêtement :

Abstract : In order to improve the cracking resistance, a new rolling process is explored for bulk zinc sheets and galvanized zinc sheets. It deals with asymmetrical rolling and asymmetrical skin-pass rolling. This type of rolling clearly changes dramatically the texture of zncuti whereas in the case of galvanized coating the texture is modified to a slight extent only. This is explained by the fact that the reduction ratio is large in rolling (ranging about 50%) whereas it is small in the skin-pass rolling (ranging about 2%). In this part results obtained by the simultaneous use of the taylor model for the prediction of textures, associated to the flow line model, are compared to the experimental results. The follow-up of the texture evolution during the deformation makes it possible to validate a posteriori the various assumptions made in the models of the last part, the study of the grain boundaries characteristics, in particular the misorientation through the grain boundary, completes the study of the mechanisms involved in the plastic deformation and cracking, in order to specify the role of the texture (intragranular cracking or cleavage are determined by grains orientation) and the grain boundaries characteristics (misorientation across grain boundary determining intergranular cracking). This study is carried out on zinc coatings in order to correlate cracking behaviors to the orientations and misorientations of grains.
Mots-clés : 669.5 Zinc-Alliages
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Grégory Vincent. Textures, microstructures et propriétés mécaniques d'alliages de zinc en feuillards et en revêtement :. Autre. Université Paul Verlaine - Metz, 2004. Français. ⟨NNT : 2004METZ013S⟩. ⟨tel-01749589⟩



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