Although a significant amount of work has been already devoted to the prediction of the macrosegration in steel ingots, the majority of them considered the solid phase as fixed. In this way it was not possible to correctly predict the macrosegregation in the centre of the product. The motion of the equiaxed grains is generally suspected to be responsible for this macrosegregation. A multiphase and multi-scale model was developed which describes the evolution of the morphology of the equiaxed crystals and their motion. It was applied to a 3.3 ton steel ingot. Computations were performed with and without taking into account the grain motion. The corresponding macrosegregation patterns are presented and compared to experimental results. It is shown that the negative macrosegregation observed in the centre of the product can be predicted only when the motion of the grains is accounted for.
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