Effects of Grain Size on the Formation of Adiabatic Shear Band in High Manganese TRIP Steel under High-Speed Impact
Adiabatic shear band(ASBs) is a crucial feature of the steels subjected to high strain rate deformation.Due to the influence of transformation induced plasticity (TRIP) effect,the formation of ASBs becomes more complicated in high manganese TRIP steels under high-speed impact.In this work,the formation features of ASBs in high manganese TRIP steels with an initial average grain size of 10μm were studied and compared with those in the initial coarse grained samples with 200μm in average grain size.The results indicate that ASBs forms more easily in the fine grained samples,because the decrease in grain size leads to the more pronounced stress concentration and the premature occurrence of TRIP effect.The quantity of body centered cubic martensite (α-M) also increases in ASBs in fine grained samples.In addition,the average width of ASBs in fine grained samples is 10μm,thinner than that of coarse grained samples,30μm.Meanwhile,Ultra-fine grained and equiaxed α-M as well as austenite of less than 0.2μm grain size within ASBs are observed,and they all demonstrate a strong typical shear microtexture.
LI Ruifeng YANG Ping
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
国际会议
成都
英文
747-748
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）