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采用N+注入，N-C-O共渗结合N+注入的表面复合改性方法，探索强化17－4PH钢表面的有效途径，该方法赋予基体表面一定深度的改性范围与低摩擦系数，因而强化效果达到最佳。同时还探索了不同时效温度下，基体心部硬度变化的规律。
N + infiltration, NCO infiltration combined with N + injection surface composite modification method to explore the effective way to strengthen the surface of 17-4PH steel, the method gives a certain depth of the substrate surface modification range and low friction coefficient, and thus to achieve the best reinforcement . At the same time, we also explored the law of the change of the core hardness of the substrate under different aging temperatures.