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在同时考虑传热、流动和溶质扩散基础上建立了预测铁素体不锈钢多元合金凝固组织的3D CAFE模型,揭示了430不锈钢凝固过程中温度、固相率及晶粒形貌的变化规律.模型中采用高斯分布描述形核密度与过冷度的关系,应用KGT模型描述枝晶的生长过程.根据Fe--C--17%Cr平衡相图确定了430不锈钢的凝固路径,在考虑凝固收缩的基础上预测了铸锭的疏松和缩孔分布.组织模拟结果与实际铸锭基本一致,二者的温度变化和组织结构特征也基本吻合.
Based on the consideration of heat transfer, flow and solute diffusion, a 3D CAFE model was established to predict the solidification microstructures of ferritic stainless steel multivariate alloy, and the variation of temperature, solid fraction and grain morphology during the solidification of 430 stainless steel was revealed. Gaussian distribution was used to describe the relationship between nucleation density and degree of undercooling.The KGT model was used to describe the growth of dendrites.The solidification path of 430 stainless steel was determined according to the equilibrium phase diagram of Fe - C - 17% Cr, Based on the results, the distribution of porosity and shrinkage porosity of ingot was predicted.The results of microstructure simulation are basically the same as those of actual ingot, and the temperature changes and the structure of the ingot are basically consistent with each other.