摘要
采用扫描电镜、透射电镜和电子背散射衍射技术对TWIP钢拉伸变形后的组织进行了观察和分析.研究结果表明,热处理后的TWIP钢中存在60%的退火孪晶,变形后孪晶量减少为32%.在拉伸过程中,具有退火孪晶的晶粒内部首先发生变形,产生的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滑移的综合结果使TWIP钢同时获得高塑性和高强度,因此变形过程中孪生变形是TWIP钢的主要变形机制.
The microstructure of twinning induced plasticity （TWIP） steel after tensile deformation was investigated by scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and electron backscatter diffraction （EBSD） analysis. The results show that there are 60% annealing twins in TWIP steel before deformation and 32 % deformed twins after deformation. The grains with annealing twins deform firstly during tensile deformation. This deformation mechanism of twinning induced plasticity provides specimens＇ excellent elongation with no-necking phenomenon. The orientation of the first deformed twin originates from the annealing twin＇s. The interactions between twin and twin, twin and dislocation, and twin and sliding play an important role during deformation. Therefore the effect of twinning induced plasticity is the main deformation mechanism.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2007年第12期1200-1203,共4页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金资助项目(No.50575022)
高等学校博士学科点专项科研基金资助项目(No.20040008024)
