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Etude de l'influence du mouvement et de la croissance des grains équiaxes sur la macroségrégation en coulée semi-continue d'aluminium

Abstract : The prediction of the macro and microstructures obtained at the end of the solidification is of great interest for the manufacturer of aluminium. In the case of the aluminium DC casting process, phenomena occurring at different scales influence the formation of the macro and microstructures: inoculation, fragmentation of dendrite arms, and growth of the grains at a microscopic scale; motion of the grains and their thermal history at a macroscopic scale. A model of growth and motion of groups of grains has been developed in the frame of the VIRCAST project. This model is simplified with regards to the coupling between the macro and micro scales. The motion and the growth of the grains are calculated using as input data the local heat extraction and the velocity fields computed from a 3D computation of heat, mass and momentum transfers in a DC casting. This model predicts the distribution of grain size, secondary dendrite arm spacing and morphology at the outlet of the casting. Both inoculation and fragmentation phenomena are taken into account
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Najat Houti-Lefay. Etude de l'influence du mouvement et de la croissance des grains équiaxes sur la macroségrégation en coulée semi-continue d'aluminium. Autre. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL095N⟩. ⟨tel-01748881⟩

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