在半连铸 70 75铝合金过程中 ,通过同时施加稳恒磁场和交变磁场的方法 ,使凝固熔体产生受迫振荡 ,研究了电磁振荡的强度和频率对晶粒细化的影响规律。对电磁振荡作用下 ,合金凝固组织的细化机理进行了探讨。结果表明 :电磁振荡法获得的晶粒尺寸要较CREM法所获得的小 ,且随着电磁振荡强度增加及频率降低 ,铸锭整体组织变得更加细小和均匀。 In the process of semi-continuous casting of 70 75 aluminum alloy, the forced oscillation of the solidified melt was produced by the simultaneous application of the steady magnetic field and the alternating magnetic field. The influence of the intensity and frequency of the electromagnetic oscillation on the grain refinement was studied. Under the action of electromagnetic oscillation, the mechanism of refinement of alloy solidification was discussed. The results show that the grain size obtained by the electromagnetic oscillation method is smaller than that obtained by the CREM method. With the increase of the electromagnetic oscillation intensity and the decrease of the frequency, the whole structure of the ingot becomes finer and more uniform.