Modeling of Macrosegregation during Solidification of Steel Ingot Casting

摘要

Macrosegreation is an important transportation phenomenon during solidification of alloys, and hence deteriorates the homogeneity and the final properties of steel ingot casting. It still remains a great challenge to predict macrosegregation in practice with numerical models. Numerical simulation of macrosegregation in steel ingot casting, including mathematical model, model validations and engineering applications are introduced in this paper. The thermal-solutal convection, equiaxed grain sedimentation, and columnar to equiaxed transition (CET) are the main factors taken into considerations of current multiphase solidification model. Mathematical model is preliminarily verified to predict the macrosegregation of Sn-Pb alloy solidified in a rectangle cavity. Moreover, simulations with non-orthogonal grids are conducted for the macrosegregation prediction in a 3.3-ton steel ingot casting.