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。 After the high-density pulse current treatment of hot-rolled 30CrMnSiA steel samples pre-fatigue unloaded under stress control, a uniform and equiaxed grain structure was obtained, the grain size is much smaller than the grain size of hot-rolled samples. The fatigue life of the treated samples is significantly increased. High-density pulse current causes fatigue dislocations to move. When the distance between edge dislocations reaches a critical distance, dislocations annihilate, local dislocation density gradients increase, and recrystallization occurs at low dislocation density Nucleation, the recrystallization of steel.