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用高密度脉冲电流对服役后期的高锰钢辙叉进行表面处理,研究了对其组织结构的影响。结果表明,在较低的温度下(786 K)辙叉发生再结晶,再结晶晶粒尺寸约为29.3μm,远比处理前的晶粒尺寸小,处理后的显微硬度显著降低。在高密度脉冲电流作用下,位错运动能力、原子的扩散能力以及振动频率都提高了,从而使再结晶的形核速率显著提高,使辙叉在较低的温度下快速完成再结晶。处理后高锰钢的疲劳寿命显著提高。
High-density pulsed current was applied to the surface treatment of the high-manganese steel frog in service in the later period, and the influence on the structure of the high-manganese frog was studied. The results showed that the frogs recrystallized at a lower temperature (786 K), and the recrystallized grain size was about 29.3 μm, which was much smaller than the grain size before the treatment. The microhardness of the frogs after treatment decreased significantly. Under the action of high-density pulse current, dislocation mobility, atom diffusion ability and vibration frequency increase, so that the nucleation rate of recrystallization is significantly increased, allowing the frog to quickly complete recrystallization at a lower temperature. After treatment, high manganese steel fatigue life increased significantly.