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文章对Cr12MoV 钢的隐晶码氏体及其强韧化进行了研究。电镜分析表明,Cr12MoV 钢的淬火隐晶马氏体的微观形态与亚结构随淬火奥氏体化温度不同而异。950℃及其以下奥氏体化温度淬火,可获得单一的板条状位错融隐晶马氏体;而经950～1100℃奥氏体化温度淬火,则获得了由针(片)状孪晶马氏体与板条状位错马氏体构成的混合隐晶马氏体组织,并且孪晶马氏体随奥氏体化温度升高而增多。经机械性能试验发现,隐晶马氏体的微观形态与亚结构对钢的强韧性有直接影响。因此,为了使Cr12MoV 钢得到最有效的强韧化效果,不仅要均匀化和细化钢中的碳化物,而且要控制钢中隐晶马氏体的微观形态与亚结构。
In this paper, the cryptocrystalline body of Cr12MoV steel and its strengthening and toughening were studied. Electron microscopy analysis shows that the microstructure and substructure of quenched cryptocrystalline martensite in Cr12MoV steel varies with the quenching austenitizing temperature. 950 ℃ and below the austenitizing temperature quenching, access to a single slab dislocation fused cryptocrystalline martensite; and 950 ~ 1100 ℃ austenitizing temperature quenching, was obtained by the needle Twinned martensite and lath dislocation martensite mixed cryptocrystalline martensite, and twinned martensite increases with increasing austenitizing temperature. The mechanical properties of the test found that the microstructure and sub-structure of cryptocrystalline martensite has a direct impact on the toughness of steel. Therefore, in order to obtain the most effective toughening effect of Cr12MoV steel, not only the carbides in the steel should be homogenized and refined, but also the microstructure and substructure of the cryptocrystalline martensite in the steel should be controlled.