双辊薄带连铸柱状晶组织模拟

Simulation of columnar grain structure in twin-roll cast strips

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Calcosoft软件中的FE-CA方法对薄带柱状晶组织进行模拟,模拟结果与实验结果基本吻合,实现了柱状晶区的可视化.应用建立的微观组织模型,研究了三种工艺参数对柱状晶区宽度的影响.结果表明:随着熔池液面高度的增加,薄带柱状晶区宽度增加;随着浇铸温度和铸辊转速的增加,薄带柱状晶区宽度减小.

The width of columnar grain zone in as cast strips is mainly determined by the length of columnar grains at nip point. The columnar grain structure was simulated by FE-CA method in Calcosoft. The visualized morphology was obtained, and the calculation results fit the experimental ones well. By use of this model, the effects of process parameters on the width of columnar grain zone were studied. The results show that the width of columnar grain zone increases with increasing liquid steel surface height in the pool, but it decreases with the increase of casting temperature and casting speed.