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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。
The observation of the internal structure of TWIP steel under different deformation variables shows that the internal tissues appear in turn as follows: a large number of dislocations, twins and the delivery of multiple twin systems. The comparative analysis of the microstructures under various deformation variables shows that the TWIP effect process mainly includes the following: the blocking effect of twins on dislocations and the enhancement of local work-hardening ability; the effect of twins and twins and the formation of twinning increase follow-up Twins resistance, followed by multiple sets of twin-crystal system effectively split the grain, increasing the twin interface, thereby enhancing the work hardening ability; twin process itself has a certain amount of deformation. The increase in local work-hardening causes the strain to migrate to other lower regions, thereby exhibiting high elongation.