利用高分辨透射电镜观察、能谱分析等实验方法,结合硬度试验、热稳定实验不同温度下的实验数据,对热作模具钢4Cr2Mo2W2V中的组织成分、碳化物的形态、大小及其演变规律和对材料高温性能的影响进行了研究。结果表明：热稳保温过程中碳化物的演变与马氏体回复过程是耦合出现的,4Cr2Mo2W2V钢在工作温度620～700℃下的热稳定性能优于传统热作模具钢3Cr2W8V,4Cr2Mo2W2V钢在650℃工作温度下的热稳定性与传统热作模具钢3Cr2W8V在620℃条件下相当。基体中的较多的Mn和相对稳定细小的Mo、V系碳化物保证了4Cr2Mo2W2V钢高温时效过程中能保持一定的硬度。
Thermal-stability of tempered 4Cr2Mo2W2V hot-work die steel under different temperatures was studied.Influence of microstructure and morphology of carbides on high-temperature properties of the steel was investigated by transmission electron microscopy（TEM）.The experimental results show that evolution of carbides and recovery of martensite occur concurrently during the thermal stability tests.The thermal-stability of 4Cr2Mo2W2V steel is better than that of 3Cr2W8V steel in the temperature range of 620 ℃ and 700 ℃.Specifically,the thermal-stability of 4Cr2Mo2W2V steel at 650 ℃ is equivalent to that of 3Cr2W8V steel at 620 ℃.It is suggested that the higher the higher thermal-stability of 4Cr2Mo2W2V steel is attributed to the higher Mn content in matrix and the stable and fine carbides of MoC and VC in the steel.
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