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采用内耗法研究了两种马氏体热作模具钢在高温服役过程中的弹性模量及内耗特征,结合JMA方程探讨了时效前期的动力学过程。结果表明:620℃热稳保温过程中4Cr2Mo2W2MnV钢的软化主要以马氏体基体回复为主,而3Cr2W8V钢基体中大量的W、C脱溶及合金碳化物的沉淀,导致材料力学性能明显下降。4Cr2Mo2W2MnV钢在620℃工作温度下的热稳定性比传统热作模具钢3Cr2W8V好,主要是由于基体中的较多的Mn和相对稳定细小的Mo、V系MC型碳化物对马氏体热作模具钢的热稳定性有贡献作用。
The internal friction method was used to study the elastic modulus and internal friction characteristics of two types of martensitic hot work die steel during service at high temperature. The kinetic process of pre-aging was discussed with the JMA equation. The results show that the softening of 4Cr2Mo2W2MnV steel mainly reverts to martensite at 620 ℃ during thermal stabilization process, while the precipitation of W and C and the precipitation of alloy carbides in 3Cr2W8V steel matrix decrease the mechanical properties obviously. 4Cr2Mo2W2MnV steel at 620 ℃ operating temperature thermal stability than the traditional hot work die steel 3Cr2W8V good, mainly due to more Mn in the matrix and relatively stable and small Mo, V series MC type carbide on the martensitic hot work Mold steel thermal stability contribute.