借助光学电镜、扫描电镜和透射电镜等研究了低温处理对3Cr2MoCoWV钢中碳化物析出的影响。结果表明：试验钢经等温淬火后，基体组织下贝氏体析出了FesC和E-碳化物；经低温处理后组织中出现了大量的孪晶马氏体，其上有细小弥散碳化物；再回火后的贝氏体铁素体板条上析出大量弥散的MC和M2C型碳化物，等温淬火过程中形成的Fe3C在高温回火中分解，析出更为稳定的针状M2C碳化物，但其仍然与基体保持一定位向关系。
The influence of low temperature treatment on the carbide precipitation in 3Cr2MoCoWV hot work die steel was studied by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results indicate that after austempering Fe3 C and s-carbide precipitations could be observed in microstructure of low bainite of steel matrix. There were an abundance of twin-martensites on which fine carbide dispersed, appearing in the microstructure of specimen after the subsequent low temperature treatment. After temper treatment, a large amount of MC and M2C e-carbides precipitation dispersedly distributed on the bainitic ferrite laths. Meanwhile, Fe3 C forming in the austempering process decomposed and formed the more stable acicular M2 C carbide, which maintained the same orientation of the ferrite matrix.
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