双辊薄带连铸凝固组织模拟微观模型的验证

Validation of micro model for solidification process of twin-roll continuous casting thin strip

以双辊薄带连续铸轧工艺凝固过程为基础,基于金属凝固的基本原理,并运用现代计算机仿真技术建立了双辊薄带连铸凝固过程的异质形核、修正的枝晶尖端生长动力学、柱状晶向等轴晶生长转变(CET)的解析模型以及基于元胞自动机(CA)的双辊薄带连续铸轧凝固组织的仿真模型,为双辊薄带连续铸轧凝固组织形成的仿真模拟奠定了基础,同时利用铝合金双辊薄带连续铸轧组织凝固过程验证了数学模拟的可行性。结果表明:可用建立的数学模型模拟预测铸轧工艺参数对双辊连续铸轧薄带凝固组织的影响。

Based on the solidification of twin-roll continuous casting thin strip, the analytical model of heterogeneous nucleation, the amended growth kinetics of dendrite tip and colunmar to equiaxed transition （CET） of dendrite during twin-roll continuous casting thin strip solidification were established by means of the principle of metal solidification and modern computer emulational technique, and based on cellular automaton, the emulational model of twin-roll continuous casting thin strip solidification was established. The basis for the emulational simulation of twin-roll casting thin strip solidification structure is provided, and the mathematical simulation feasibility is confirmed by experiments. It is found that the established mathematical model is reliable, and it can be used to predict the influence of casting parameters on solidification structure of twin-roll continuous casting thin strip.