将晶粒尺寸分别为2、7、80μm的微合金钢在295～973 K温度范围内进行单轴拉伸试验,通过对比分析3种不同晶粒尺寸微合金钢的工程应力-应变曲线及微观组织,讨论了超细晶粒钢在不同温度下的塑性变形机制.在295～473 K范围内,3种不同晶粒尺寸微合金钢的塑性变形机制以位错运动为主;在573 K,晶界滑动开始在超细晶粒钢中出现,在973 K,成为塑性变形的主导机制;粗晶粒钢在573～973 K范围内以位错运动为塑性变形的主要机制.
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