对高锰奥氏体孪晶诱发塑性(TWIP)钢室温单向拉伸与拉压疲劳行为进行了研究.单向拉伸和疲劳实验的应变速率均为6×10-3 s-1.疲劳实验采取轴向总应变控制,应变比为-1.结果表明,随拉伸应变的增加,应力-应变曲线上的锯齿状塑性流动呈现出不同的特征,具有很强的应变敏感性.在不同应变幅下的低周疲劳实验中,高锰奥氏体TWIP钢表现出很强的循环硬化能力.低应变幅时表现为初始循环硬化,随后稳定;中等应变幅时,表现为初始循环硬化后出现不同程度的循环软化,然后稳定;高应变幅时经短暂循环硬化后开始循环软化,直至失效.较高应变幅下循环失效后的奥氏体晶粒内产生了大量的位错、位错墙、迷宫结构以及位错胞等位错结构,在部分晶粒内还观察到了细小的形变孪晶.
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