Effects of Strain Rate on the Mechanical Properties and Microstructure of the High-Mn Steel
In order to research the effects of strain rate on the strain induced γ→α or γ→ε transformation in high-Mn steel,tensile tests are performed at different strain rates of 10-1s -1,10-2s-1,10-3s-1.Results indicate thatYield strength is line up straight with the rise of strain rate,but the tensile strength and elongation are opposite.SFE and ΔGγ→ε of the tested material at 293K are calculated to be 14.56mJ/m2 and -24.52J/mol,and the deformation-induced γ→α and γ→ε transformation both occurs.With the rise of strain rate,the volume fraction of ε-martensite decreases,and the volume fraction of α-martensite climbs up and then declines.The α′-martensite holds the Kurdjumov–Sachs (K–S) orientation relationship with γ phases,and the Shoji–Nishiyama (S–N) orientation relationship is observed betweenthe ε-martensite and γ phases,whereas ε-martensite and α′-martensite are satisfied with the Burgers relation.With the rise of strain rate,the number of dimples decrease,but the diameter and depth of the dimples become large.
high-Mn steel TRIP effect strain rate strain-hardening
SUN Shaoheng ZHAO Aimin WU Qiwei
Collaborative Innovation Center of steel Technology, University of Science and Technology Beijing, B Collaborative Innovation Center of steel Technology, University of Science and Technology Beijing, B Engineering Research Institute, University of Science and Technology Beijing,Beijing 100083, China
国际会议
成都
英文
309-312
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）