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将脉冲电流作用于铁素体不锈钢,发现经过脉冲电流处理后等轴晶比例大幅增加,晶粒明显缩小。建立了考虑集肤效应的三维电磁场瞬态有限元模型,利用ANSYS软件对电极及熔体内的电场、磁场、电磁力分布进行了计算,结果表明,由于集肤效应使得电磁场主要集中在电极周围和熔体上部,且在脉宽的后期电磁场的方向由于涡流的存在而发生变化;电极间距对熔体电磁场均匀性具有较大影响;随着脉冲电流的脉宽减小,熔体上部的电磁场增强,但集肤深度也越小,同时作用时间缩短。
Applying pulsed current to ferritic stainless steel, it was found that the proportion of equiaxed grains increased sharply after pulse current treatment, and the grain size was significantly reduced. The transient finite element model of three-dimensional electromagnetic field considering the skin effect was established. The distributions of the electric field, magnetic field and electromagnetic force in the electrode and melt were calculated by ANSYS software. The results show that the electromagnetic field mainly concentrates around the electrode due to skin effect And the upper part of the melt, and the direction of the electromagnetic field changes due to the eddy current in the late pulse width. The distance between the electrodes has a great influence on the uniformity of the electromagnetic field of the melt. As the pulse width of the pulse current decreases, the electromagnetic field Enhanced, but the skin depth is smaller, while the role of shortening.