Mn和W元素对4Cr2Mo2W2V模具钢热稳定性的影响

Effect of Mn and W on thermal stability of 4Cr2Mo2W2V die steel

基于不同Mn和W含量的4Cr2Mo2W2V热锻模具钢的回火特性曲线,以及在620℃不同保温时间的力学性能,揭示了不同Mn和W含量下4Cr2Mo2W2V钢中碳化物的演变规律,并探讨其对该钢高温性能的影响。同时,结合Johnson-Mehl-Avrami(JMA)方程分析了合金元素Mn和W对回火稳定性动力学过程的影响。结果表明,Mn和W元素的增加使4Cr2Mo2W2V钢的二次硬化峰向右移动,热稳定实验与理论分析结果一致,Mn和W元素能有效抑制碳化物粗大,增强马氏体的抗回复能力。

The influence of different contents of Mn and W elements on the carbides evolution and high temperature properties of4Cr2Mo2W2 V hot forging die steel was investigated based on the relationship between hardness and tempering temperature and the mechanical properties of the steel tempering at 620 ℃ holding for different time. Meanwhile,the kinetic of thermal stability during tempering was evaluated combined with the Johnson-Mehl-Avrami( JMA) equation. The results indicate that,with the increasing of Mn and W contents,the secondary hardening peak of 4Cr2Mo2W2 V shifts to the right. The experimental results obtained from the thermal stability test are consistent with the theoretical calculation,it suggests that the Mn and W elements can inhibit the coarsening of carbide and improve the anti-recovery capability of martensite.