摘要
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 work-hardening, then other grains turn to favorable orientation to complete further deformation. This deformation mechanism of twinning induced plasticity provides excellent elongation with no-necking phenomenon. The orientations of first deformed twins are transferred to annealing twin＇s hereditarily. The twin-twin interaction, the twin-dislocation interaction and the twin-sliding interaction play an important role during deformation. Key
出处
《钢铁》
CAS
CSCD
北大核心
2007年第12期73-76,共4页
Iron and Steel
基金
国家自然科学基金资助项目(50575022)
高等学校博士学科点专项科研基金(20040008024)
