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研究了高铬铸铁Cr13Mn3MoV2经亚临界与深冷处理后的组织、硬度和耐磨性。结果表明,高铬铸铁的显微组织主要是由奥氏体、马氏体和(Cr,Fe)7C3共晶碳化物组成。高铬铸铁经深冷处理后的硬度明显高于空冷,相比铸态,随着亚临界处理温度从400℃到650℃,其经历了从低于铸态硬度到硬度增大并超过铸态,并且出现二次硬化再到硬度又降低的过程,这主要是在热处理过程中马氏体的回火及残余奥氏体转化为马氏体的结果。在520℃和600℃进行亚临界处理耐磨性最好,而在540℃,其耐磨性能最差,而且硬度与耐磨性没有完全的对应关系。
The microstructure, hardness and wear resistance of high chromium cast iron Cr13Mn3MoV2 after subcritical and cryogenic treatment were studied. The results show that the microstructure of high chromium cast iron is mainly composed of austenite, martensite and (Cr, Fe) 7C3 eutectic carbides. The hardness of high chromium cast iron after cryogenic treatment is obviously higher than that of air cooling. Compared with the as-cast state, with the subcritical treatment temperature from 400 ℃ to 650 ℃, the hardness of high-chromium cast iron has gone from below as-cast hardness to hardness and beyond the as-cast state, And the secondary hardening and then to the hardness and lower the process, which is mainly in the heat treatment of martensite and residual austenite into martensite results. The subcritical treatment at 520 ℃ and 600 ℃ showed the best wear resistance, but the worst wear resistance was at 540 ℃, and the hardness and wear resistance were not completely corresponded.