TWIP效应分析

来源期刊：钢铁2010年第8期

论文作者：胡超 杨钢 聂学青 王向斌 黄崇湘

文章页码：70 - 74

关键词：等径角挤压； TWIP钢； 形变孪晶

Key words：equal channel angular pressing； transformation induced plasticity(TWIP)； deformation twin

摘    要：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。

Abstract: With continuous observing the microstructure of TWIP steel at different tension,with increase in deformation,the microstructures can be seen in the following states: lots of dislocation,twins,multi-twinning systems were activated and intersected each other.The TWIP effects are as follows during tension:dislocations are against by twins,work hardening is raised;the twins which are produced in the first are against the twins which are produced as follow,and the more twin boundaries also against dislocation to move,so work hardening is continuously raised;the process of twins has a certain deformation.Work hardening is raised in this part so make the strain transfer to other low parts,as makes the steel show good elongation.