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以W18Cr4V钢为研究对象,采用透射电镜和硬度测试仪分析不同冷处理方式下该钢组织及硬度的变化规律。结果表明,冷处理前W18Cr4V钢的马氏体片上出现密集分布的孪晶和位错网,冷处理后马氏体孪晶带上弥散析出了细小的碳化物,尺寸约为5~10 nm,且碳化物的数量随着冷处理次数的增加而增加;W18Cr4V钢的硬度随着冷处理温度的升高而降低,较未处理试样,冷处理可提高W18Cr4V钢硬度。
Taking W18Cr4V steel as the research object, the variation regularity of the microstructure and hardness of the steel under different cold treatments was analyzed by transmission electron microscopy and hardness tester. The results show that there are densely distributed twins and dislocation networks on the martensite sheets of W18Cr4V steel before cold treatment, and the fine carbides are precipitated on the martensite twinned bands after cold treatment. The sizes are about 5 ~ 10 nm, The amount of material increased with the increase of the number of cold treatment. The hardness of W18Cr4V steel decreased with the increase of cold treatment temperature. Compared with the untreated specimen, cold treatment increased the hardness of W18Cr4V steel.