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使用有限元软件Procast中的元胞自动机-有限元模型,建立了一个模拟双辊连续铸轧纯铝凝固微观组织形成的随机性模型。综合考虑了溶质再分配、界面曲率、晶粒择优生长的作用,基于有限元建立了宏观温度场计算和一个改进的元胞自动机模型。采用基于高斯分布的连续性形核模型,辊面和熔体内部的形核分别采用两种形核分布函数;枝晶尖端生长速度采用与局部过冷度有关的修正KGT模型。利用软件计算结果模拟了不同浇注温度和熔液内部平均形核过冷度对凝固微观组织形成的影响。
Using the finite element model and finite element software Procast, a stochastic model was established to simulate the solidification microstructure of pure aluminum cast by two-roll continuous casting. Considering the effects of solute redistribution, interface curvature and grain preferential growth, a macro-temperature field calculation and an improved cellular automata model are established based on the finite element method. Based on the continuous nucleation model based on Gaussian distribution, two kinds of nucleation distribution functions are used for the nucleation on the roll surface and the melt, respectively. The modified KGT model related to local undercooling is adopted for the growth rate of dendrite tip. The effects of different pouring temperatures and the average nucleation of undercooling on the microstructure formation were simulated by software calculations.