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测定了不同Ｃｕ含量的Ｃｕ－Ｎｂ－Ｎｉ－Ｃｒ－Ｍｏ钢在４５０～６５０℃时效时的硬度变化曲线，并结合光学金相与电镜观察分析了时效过程中的组织变化与脱溶沉淀行为．实验结果表明：时效硬化是 －Ｃｕ析出强化，Ｎｂ的碳氮化物以及含Ｃｒ的碳化物强化综合作用的结果：相同时效温度下，含Ｃｒ碳化物的时效峰在时效后期出现；在低钢钢中，时效前期出现的 －Ｃｕ时效峰与Ｎｂ的碳氢化物时效峰重叠；在高钢钢中，由于铜含量升高， －Ｃｕ时效峰出现时间缩短， －Ｃｕ时效峰与Ｎｂ的碳氨化物时效峰逐渐分离．
The hardness curves of Cu-Nb-Ni-Cr-Mo steels with different Cu contents at 450-650 ℃ were measured. The microstructures and desolventive behavior of Cu-Nb-Ni-Cr-Mo steels during aging were analyzed by optical microscope and electron microscope. The experimental results show that the age hardening is the result of the combination of -Cu precipitation strengthening, Nb carbonitride and Cr-containing carbide strengthening. The aging aging peak of Cr-containing carbide appears at the later aging stage in the same aging temperature. In the low-steel , The age-onset peak of-Cu overlaps with the age-hardening peak of Nb at the early aging time. In high-steel steel, the appearance time of -Cu aging peak is shorter due to the increase of copper content. The duration of the -Cu aging peak and the carbonitride aging peak of Nb Gradually separated.