【摘要】 采用Ansys Workbench软件对螺旋环缝式电磁场作用下7075铝合金熔体处理过程中的电磁场、流场及温度场进行了耦合数值模拟。结果表明,与旋转电磁场相比,螺旋电磁场能同时在轴向及径向上对熔体施加较强的剪切作用,降低了7075铝合金熔体的温度梯度。试生产结果表明,经螺旋环缝式电磁搅拌处理后的7075铝合金平均晶粒尺寸减小且均匀性明显提高,宏观偏析也得到明显改善,试验结果与模拟结果一致。更多还原

【Abstract】 The electromagnetic field,flow field and thermal field of 7075 aluminum alloy during melt treatment in spiral annular electromagnetic field were simulated by the commercial numerical software Ansys Workbench.Numerical results show that compared with rotating electromagnetic field,the 7075 alloy melt is stirred forcely by a spiral electromagnetic field both in radial and axial directions.The temperature gradient of the 7075 alloy melt is narrawed.Subsequently,the numerical results were verified experimentally,and the experimental results were consistent with the numerical ones.The average grain size of 7075 alloy treated by spiral annular electromagnetic field is reduced,and the uniformity is improved obviously.The macro-segregation of the 7075 alloy casting is decreased obviously.更多还原