Abstract
An experimental investigation of the macrosegregation occurring in a commercial size direct chill cast of an 5182 alloy ingot is described. The extent of the chemical homogeneity in a sheet ingot depending of the grain refining practice is discussed. A complete analysis of 2D macrosegregation maps and of the associated grain structure in a non grain refined part and a grain refined part of the ingot is compared and discussed. The intensity of the centerline segregation is modified via the grain refining practice. The change of macrosegregation measured in the slices with and without grain refiner may be attributed to the effects of the grain motion but also the liquid movement.
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