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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。
Based on the tempering curves of 4Cr2Mo2W2V hot-forging die steels with different contents of Mn and W, and the mechanical properties at different holding time at 620 ℃, the evolution of carbides in 4Cr2Mo2W2V steels with different contents of Mn and W was explored, The high temperature performance of the steel. At the same time, the influence of alloying elements Mn and W on the tempering stability kinetics was analyzed with the Johnson-Mehl-Avrami (JMA) equation. The results show that the increase of Mn and W elements make the secondary hardening peak of 4Cr2Mo2W2V steel move to the right. The results of thermal stability experiment are consistent with the theoretical analysis. Mn and W elements can effectively inhibit the coarse carbide and enhance the martensite resistance.