文献类型：期刊文献

英文题名：Effective Microstructure Unit in Control of Plasticity during Strain-Controlled Fracture

作者：Long, Shao-lei Liang, Yi-long Lin, Min Yang, Ming Yin, Cun-hong Long, Qiong

通信作者：Long, SL[1];Liang, YL[2];Liang, YL[3]

机构：[1]Guizhou Inst Technol, Coll Mat Sci & Met Engn, Caiguan Rd 1, Guiyang, Guizhou, Peoples R China;[2]Guizhou Univ, Coll Mat Sci & Met Engn, Xibei Rd, Guiyang, Guizhou, Peoples R China;[3]Guizhou Univ, Guizhou Key Lab Mech Behav & Microstruct Mat, Xibei Rd, Guiyang, Guizhou, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Coll Mat Sci & Met Engn, Caiguan Rd 1, Guiyang, Guizhou, Peoples R China;corresponding author), Guizhou Univ, Coll Mat Sci & Met Engn, Xibei Rd, Guiyang, Guizhou, Peoples R China;corresponding author), Guizhou Univ, Guizhou Key Lab Mech Behav & Microstruct Mat, Xibei Rd, Guiyang, Guizhou, Peoples R China.|贵州理工学院;

年份：2019

卷号：90

期号：11

外文期刊名：STEEL RESEARCH INTERNATIONAL

收录：;EI(收录号：20194407597827);Scopus(收录号：2-s2.0-85074022459);WOS:【SCI-EXPANDED(收录号:WOS:000488211400001)】；

基金：The research documented in this study was financially supported by the National Natural Science Foundation of China (Grant nos. 51461006 and 51671060) and the Natural Science Foundation of Guizhou Province, China (Grant nos. [2014] 2003, [2014] 6012, [2017] 7244 and [2018] 247).

语种：英文

外文关键词：20CrNi2Mo steel; effective control unit; lath; martensite; multilevel microstructure

摘要：Strain-controlled fracture is investigated in 20CrNi2Mo steel using the Hall-Petch relationship, electron backscatter diffraction (EBSD), and other techniques. An interesting result is that the ductility of the tested steel increases with a coarsening of prior austenite grains. This finding is in contrast to conventional understanding. Meanwhile, the strain after necking is approximately 2/3 of the total strain, and the value of U-C (crack propagation energy per unit volume) reaches 95% of U-K (static toughness). The ductility of 20CrNi2Mo steel also depends on crack propagation. Furthermore, the Hall-Petch relationships between ductility and multilevel microstructure demonstrate that lath is the effective control unit of the plasticity of the tested steel. Lath also plays a key role in crack propagation that results from the rotating, bending, and shearing of lath, as confirmed by fracture analysis and EBSD.