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利用光学显微镜(OM)、透射电镜(TEM)、X射线衍射仪(XRD)、拉伸和硬度试验,研究Co-Cu合金化马氏体时效硬化不锈钢不同时效温度(440~520℃)处理后的组织和性能。结果表明:随着时效温度的升高,马氏体板条变宽且内部位错密度降低,薄膜状逆转变奥氏体量增多,富铜相颗粒弥散析出并逐渐长大粗化;强度、硬度先升后降,伸长率先降后升。试验钢在480℃时效2 h后具有良好的综合力学性能,此时抗拉强度、屈服强度、伸长率及硬度分别为1401 MPa、1312 MPa、12%和387.1 HV0.5。
The microstructures of Co-Cu alloyed martensitic stainless steels aged at different aging temperatures (440 ~ 520 ℃) were studied by optical microscope (OM), transmission electron microscopy (TEM), X-ray diffraction (XRD) Organization and performance. The results show that as the aging temperature increases, martensite lath becomes wider and the internal dislocation density decreases, the amount of film-like reverse transformation austenite increases, and the copper-rich phase particles disperse and grow up gradually. The strength, The hardness first and then decrease, the elongation decreased first and then increased. The tensile strength, yield strength, elongation and hardness of the test steels were 1401 MPa, 1312 MPa, 12% and 387.1 HV0.5, respectively, after aging at 480 ℃ for 2 h.