中文摘要：

宏观偏析普遍存在于铸造合金凝固过程中，严重影响了材料的使用性能。本文利用宏观偏析数学模型，分别对53 t钢锭和500 t铸件宏观偏析进行数值模拟研究。模型考虑了凝固收缩与等轴晶沉降，模拟结果和实验结果吻合较好。

英文摘要：

Macrosegregation usually occurs during the casting alloy solidification process , which greatly deteriorate the service material performance .In this paper , by means of the mathematic model , numerical simulation researches are conducted for the cast macrosegregation of 53 t and 500 t ingots .Solidification shrinkage and equiaxial crystal set-tlement are considered in the model , the simulation result is well consistent with the test results .