中文摘要：

应用 CAFE 法对6．5％Si 高硅钢铸锭凝固组织进行了模拟研究，确定出了适合高硅钢组织模拟的模型.进一步用该模型研究了过热度及冷却条件对凝固组织的影响，结果表明，随着过热度的降低，凝固组织中柱状晶比例和晶粒平均面积均减小.水冷条件下，高硅钢铸锭凝固组织几乎全是柱状晶，而且晶粒粗大.空冷条件下，等轴晶区扩大，但柱状晶仍占主要部分.缓冷条件下，等轴晶区占主要部分，晶粒平均面积和空冷条件下相当.

英文摘要：

The solidification structure of 6.5%Si steel ingot was simulated based on CAFE method and the model suitable for simulating the structure of high silicon steel wad ascertained.The influence of superheat and cooling condition on the solidification structure were studied.It was shown that with the superheat decreasing,the pro-portion of columnar crystals decrease,and the average grain size become smaller.Under water cooling condi-tion,the solidification structure of casting was composed of almost all coarse columnar grains.Under air cooling condition,equiaxed grains zone expanded,while columnar grains still account for the main part of the structure. Under slow cooling condition,equiaxed grains account for the main part of the structure and the average grain size was basically the same with those under air cooling condition.