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The macrosegregation has been one fascinating but lancinating focus for solidification research field for a long history,1-3) because there are still some complicated scientific questions without complete clarification until now. It is generally accepted that the macrosegregation can be attributed to the interdendritic thermosolutal convection.4-6) Namely, in the mushy zone, the solute partition between solidified crystal and the residual melt will produce the solute enriched interdendritic melt. According to the theory of fluid mechanics, the enriched interdendritic melt will flow under the effects of density difference and gravity,7) which will change the solute distribution and result in the macrosegregation. Meanwhile, some important traditional and new opinions considered the influence of solidification shrinkage. And the main contributing factor for the enriched melt flow and the solute redistribution is attributed to the melt feeding.8,9) There is no doubt that both flow patterns exist in actual solidification process. In the early stage of solidification with low solid fraction, the thermosolutal convection plays the main role, and in the later stage of solidification with high solid fraction, the melt feeding is the dominant flow pattern. The key question lies in which flow pattern dominates the final macrosegregation phenomenon. We try to clarify this question in current work through special designed local thermal control, which may distinguish the significance of the two different flow patterns on macrosegregation.

Macrosegregation and Its Formation Mechanism in Steel Ingot with Designed Local Thermal Control