基于CA-FE的双辊连铸纯铝凝固组织模拟

Numerical Simulation of Solidified Microstructure of Twin-roll Continuous Casting Pure Aluminum Based on CA-FE Method

鉴于双辊薄带连铸等轴晶区半固态铸轧组织对产品性能的重要性,应用Procast软件中的CA-FE方法对工业纯铝在水冷钢辊连续铸轧中的凝固过程进行了模拟,建立了宏观温度场、浓度场和微观生长过程耦合的凝固组织模拟模型。以CA(Cellular Automaton)模型为基础,建立了晶粒生长过程的局部演变规则,在晶粒尺度上模拟了其凝固过程。应用建立的微观组织模型,研究了工艺参数对凝固组织的影响。模拟结果与实验结果基本吻合,检验了模型的正确性与适用条件。

The width of columnar grain zone in as cast strips is mainly determined by the length of co lumnar grains at nip point. Coupling temperature field, concentration field and micro growth, the simulation of the solidification structure on the solidification process of pure aluminum in watercooled steel mould of twinroll continuous casting was presented by CAFE method in Procast. The model was built according to Cellular Automaton model and the locally functioned law of grain growth was established. By this model, the solidification of the singlephase pure aluminum was simulation and studied on the grain scale. By use of this model, the effects of process parameters on the solidification structure were studied. The calculation results fit the experimental ones well, and then the validity and the applicability of the model were tested.