采用3 D-CAFE法与实验相结合的方法,研究形核参数(nv,max,△Tv,max)和过热度对430铁素体不锈钢凝固组织的影响.本文条件下得到nv,max越大,AT、max越小,晶粒越细小.计算得到最佳过热度值为20℃,并进行了过热度为20℃的实验室实验,试样的凝固组织几乎全部为球形等轴晶,晶粒的平均直径从表面到中心依次增加.实验室试样的晶粒平均直径为918.07 μm,3D-CAFE模型计算20℃过热度试样的晶粒平均直径为920.13μm.计算得到的凝固组织与实验结果基本一致.
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