Stacking Fault Energy in Fe-Mn-C-Si-Cr High Manganese Steels and Experimental Investigation
Author of the article:LANG Dong;HUANG Weigang
Author's Workplace：School of Materials Science and Engineering,Sichuan University,Chengdu 610065,China
Key Words：high manganese steels thermodynamic model stacking fault energy(SFE) mechanical properties work hardening
Abstract：
Based on a thermodynamic model proposed by Cohen and Olson,the effects of Cr and Si contents on the stacking fault energy(SFE)of Fe-(7-25)Mn-0.6 C-Cr-Si high manganese steels were studied.The mechanical properties and work hardening behavior of Fe-15 Mn-0.6 C-4 Cr-3 Si high manganese steel were investigated by tensile and impact tests.The results show that the stacking fault energy in high manganese steel decreases with the increase of Cr content.The effect of Si on the stacking fault energy depends on the content of Mn in the steel.When the content of Mn is lower than 13%,the stacking fault energy increases first and then decreases with the change of Si content.When the content of Mn is 13%,the stacking fault energy first remains unchanged with the increase of Si content,and when the content of Si is more than 3%,the stacking fault energy decreases with the increase of Si content.When the content of Mn exceeds 13%,the increase of Si decreases the stacking fault energy in steel.The tensile strength,yield strength and elongation of the tested steel are 928 MPa,450 MPa and 28.6%,respectively,and the impact toughness is 156 J/cm2.A large amount of-martensite is produced in the test steel during deformation,which makes it have high work hardening ability.
