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研究了低碳钢在低周冲击疲劳循环形变阶段的晶界行为用扫描电子显微镜对试样表面进行了观察，结果表明晶界表现出如下特征：滑移线既可连续地跨越晶界，也可受阻于晶界井形成台阶；晶界发生诸如增粗、消失等现象；伴随着形变过程，出现新的亚晶界；晶界既阻碍滑移，又激发次滑移系开动讨论了产生这些现象的可能机制
The grain boundary behavior of low carbon steel during low cycle shock fatigue cycle deformation was observed by scanning electron microscopy. The results show that the grain boundary exhibits the following characteristics: the slip line can continuously cross the grain boundary and Can be blocked in the grain boundary well to form a step; grain boundaries such as thickening, disappearance and so on; along with the deformation process, a new subgrain; grain boundary both impede slippage, and stimulate the sub-slip system to start the discussion of these Possible mechanism of the phenomenon