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建立了有限元(Finite Element)和元胞自动机法(Cellular Automaton)相结合的宏微观耦合的CA-FE模型,实现了电磁搅拌作用下Al-5%Cu合金凝固组织的数值模拟。该模型利用ANSYS软件计算电磁力,利用有限差分法计算宏观流场和温度场。在微观计算中,采用基于高斯分布的连续形核模型,并采用KGT生长模型计算枝晶尖端生长速率。模拟和实验结果表明,施加电磁搅拌后,铝合金的温度场均匀,冷却速率加快,利于组织细化。
A macro-micro-coupled CA-FE model combining Finite Element and Cellular Automaton was established to simulate the solidification structure of Al-5% Cu alloy under electromagnetic stirring. The model uses ANSYS software to calculate the electromagnetic force, and uses the finite difference method to calculate the macroscopic flow field and temperature field. In microscopic calculation, the continuous nucleation model based on Gaussian distribution was adopted, and KGT growth model was used to calculate the growth rate of dendrite tip. Simulation and experimental results show that after the electromagnetic stirring is applied, the temperature field of the aluminum alloy is uniform and the cooling rate is accelerated, which is good for the refinement of the structure.