采用扫描电镜、透射电镜对TWIP钢的拉伸变形过程中的孪晶进行了观察。研究结果表明，在TWIP钢的拉伸过程中，具有孪晶界的晶粒内部首先发生变形，并产生一定程度的加工硬化，随后其余部分晶粒发生转变，形成对变形有利的取向，从而变形得到扩展，最终得到非常大的无颈缩延伸；并且最先变形孪晶遗传了退火孪晶的取向。变形过程中孪晶和位错相互作用、孪晶和孪晶相互作用以及孪晶取向改变引发的滑移是使TWIP钢得到强化的主要变形机制。
The microstructure of Twinning Induced Plasticity (TWIP) steel during tensile deformation was investigated with SEM and TEM. The results showed that the twins deformed firstly with workhardening, then other grains turn to favorable orientation to complete further deformation. This deformation mechanism of twinning induced plasticity provides excellent elongation with nonecking phenomenon. The orientations of first deformed twins are transferred to annealing twin’s hereditarily. The twintwin interaction, the twindislocation interaction and the twinsliding interaction play an important role during deformation.
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