用实验与模拟计算相结合的方法研究了水冷条件下430铁素体不锈钢的温度场分布、流场分布及凝固组织.水冷条件下,铸件的凝固组织几乎都是等轴晶,当顶部的传热系数h=100 W/(m2·K),四周和底部的传热系数h=2000 W/(m2·K)时,模拟计算的凝固组织与实验得到的组织基本一致.采用CAFE模块对水冷条件下铁素体不锈钢凝固过程的温度场和流场进行分析,得到铸件底部凝固前沿和液相线前沿温度梯度最大分别为6.75 K/mm和7.15 K/mm,从侧壁到中心,液相线前沿和凝固前沿的温度梯度逐渐降低;铸件底部到顶部固液两相区的宽度逐渐增加然后减小,固液两相区内流体流动速率逐渐降低,在底部达到最大值4.23 mm/s;液相线前沿流体流动速率呈逐渐增大的趋势,平均值为2.40 mm/s.
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