对不同形变量下TWIP钢内部组织观察发现,在形变量由小到大的过程中,内部组织依次呈现为:大量位错,孪晶,多个孪生系统的交割.对比分析各形变量下组织情况可以发现TWIP效应过程主要有如下几点:孪晶对位错的阻塞作用,提高了局部加工硬化能力;孪晶与孪晶的作用,孪晶的形成增加了后续孪晶的阻力,其次多套孪生系统有效地对晶粒进行了分割,增加了孪晶界面,从而提高了加工硬化能力;孪生过程本身具有一定的形变量.局部加工硬化的提高,使应变向其他较低区域转移,从而表现出很高伸长率.
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