Fe-Mn-C-Si-Cr高锰钢中的层错能和实验研究

Stacking Fault Energy in Fe-Mn-C-Si-Cr High Manganese Steels and Experimental Investigation

基于Cohen和Olson提出的热力学模型,研究了Cr和Si含量对Fe-(7-25)Mn-0.6C-Cr-Si高锰钢层错能的影响,并通过拉伸和冲击实验,探究了Fe-15Mn-0.6C-4Cr-3Si高锰钢的力学性能和加工硬化行为。结果表明,高锰钢中的层错能随Cr含量的增加而降低。Si对层错能的影响取决于钢中的Mn含量,当Mn含量低于13%时,层错能随Si含量的变化呈现出先增加后降低的趋势。当Mn含量为13%时,层错能先随Si含量的增加而保持不变,当Si含量超过3%时,层错能随Si含量的增加而下降。当Mn含量超过13%时,Si的增加降低钢中的层错能。试验钢的抗拉强度和屈服强度为928 MPa和450 MPa,伸长率为28.6%,冲击韧度为156 J/cm^(2)。试验钢在变形过程中产生大量的-马氏体,使其具有较高的加工硬化能力。

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/cm^(2).A large amount of-martensite is produced in the test steel during deformation,which makes it have high work hardening ability.