Abstract
A model for predicting macrosegregation during solidification of casting alloys has been developed. The continuum formulation was used to characterize the macroscopic mass, energy and momentum transports for two-phase systems. It was assumed that the interdendritic liquid flow was driven by thermal and solutal buoyancy, as well as by solidification contraction. The movement of free surface during solidification contraction and of precipitated solid phases in the early stage of solidification was taken into account. Validation of this model was performed for the case of inverse segregation in a directionally solidified Al-4.0% Cu casting with equiaxed grains. Calculated results show that positive segregation is formed in the vicinity of the bottom chill, associated with negative segregation in the mushy zone.
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