对在应力控制下预疲劳卸载的热轧态30CrMnSiA钢样品进行高密度脉冲电流处理后,得到了细小均匀的等轴晶组织,晶粒尺寸远小于热轧样品的晶粒尺寸.处理后样品的疲劳寿命显著提高.高密度脉冲电流使疲劳形成的位错产生运动,当刃型位错的距离达到临界距离时,位错发生湮灭,使局部的位错密度梯度增大,在位错密度低的地方发生再结晶形核,使钢发生再结晶.
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