STUDY ON THE FORMATION OF ″A″ SEGREGATION IN STEEL INGOT.

Abstract

″A″ segregation was formed at the solidification front where the solid fraction ranged from 0. 30 to 0. 35. The term ″solidification front″ refers to the interface between a solid-like zone and a liquid-like zone in the solid-liquid region. The solute-enriched interdendritic liquid metal can flow into the strings even when the solid fraction in the neighborhood is 0. 7. The transition of ″A″ segregation zone to ″V″ segregation zone is caused by a suction effect. Solidifcation in ″A″ segregation proceeds outwards from the inside. The inclination is determined by the vector sum of the advancing rate of the solidification front and the floating velocity of solute-enriched liquid metal.