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通过使用数值模拟和实验相结合的方法,研究低频电磁场对铝合金半连续铸造过程中宏观物理场与铸锭的组织和裂纹的影响;比较低频电磁铸造和DC铸造过程的宏观物理场。结果表明:应用电磁场可以完全改变熔体的流动方向,加快流动速度,均匀熔池内熔体温度,降低温度梯度,提升等温线,减少液穴深度和铸造应力及塑性变形;低频电磁铸造还可以明显细化铸锭的微观组织和消除铸造裂纹,其原因是低频电磁场改变了宏观物理场。
Through the combination of numerical simulation and experiment, the influence of low frequency electromagnetic field on microstructure and crack of macro physical field and ingot during semi-continuous casting of aluminum alloy was investigated. The macroscopic physical field of low frequency electromagnetic casting and DC casting process was compared. The results show that the application of electromagnetic field can completely change the flow direction of the melt, speed up the flow rate, melt the melt temperature in the molten pool, lower the temperature gradient, increase the isotherm, reduce the depth of the liquid hole and the casting stress and plastic deformation; Refine the ingot microstructure and eliminate casting cracks, the reason is that low-frequency electromagnetic field changes the macro-physical field.