Li Ming, Bai Yongjun, Ou Yi, Ren Xiaoyu, Qian Chaoqun
Nanjing University of Science and Technology, Nanjing, 210094, China.
Shanghai Nuclear Engineering Research and Design Institute Co., Ltd, Shanghai, 200233, China.
Heliyon. 2025 Jan 15;11(2):e41797. doi: 10.1016/j.heliyon.2025.e41797. eCollection 2025 Jan 30.
This study systematically analyzes the friction and wear properties, as well as the fatigue life characteristics, of high-hardness nickel-based alloys under specialized working conditions. The primary contribution lies in elucidating the frictional behavior and wear mechanisms of these alloys under varying rotational speeds, loads, and lubrication environments, while establishing S-N curves specifically tailored to nickel-based alloys. These findings provide theoretical support for optimizing their engineering applications in extreme environments. Friction and wear tests are conducted using a Bruker UMT Tribolab wear testing machine to examine surface wear morphology. A white-light interferometer is employed to measure wear profiles and calculate wear rates, while a fatigue testing machine collects stress-life data to model S-N curves. Experimental results show that increasing rotational speed slightly raises the average coefficient of friction, with adhesion on the material surface positively correlated to speed. The wear rate initially decreases and then increases with higher rotational speeds. Under increasing load, the fluctuation amplitude of the friction coefficient diminishes and stabilizes, accompanied by a gradual decline in its average value. The furrow phenomenon on the surface correlates positively with load, and while the wear rate decreases with increasing load, the rate of decrease slows over time. The formation of a lubricating film contributes to the uniform distribution of the load, and a positive correlation is observed between the wear rate and the coefficient of friction. Fitting results of the S-N curve reveal that the fatigue life of nickel-based alloys adheres closely to an exponential function relationship. This study offers critical theoretical insights to support the design and application of nickel-based alloys in extreme conditions, such as those encountered in nuclear power systems.
本研究系统地分析了高硬度镍基合金在特定工作条件下的摩擦磨损性能以及疲劳寿命特性。主要贡献在于阐明了这些合金在不同转速、载荷和润滑环境下的摩擦行为及磨损机制，同时建立了专门针对镍基合金的S-N曲线。这些研究结果为优化其在极端环境中的工程应用提供了理论支持。使用布鲁克UMT Tribolab磨损试验机进行摩擦磨损试验，以检查表面磨损形态。采用白光干涉仪测量磨损轮廓并计算磨损率，同时使用疲劳试验机收集应力-寿命数据以建立S-N曲线模型。实验结果表明，转速增加会使平均摩擦系数略有升高，材料表面的粘着现象与转速呈正相关。磨损率最初随转速升高而降低，随后又升高。在载荷增加时，摩擦系数的波动幅度减小并趋于稳定，同时其平均值逐渐下降。表面的犁沟现象与载荷呈正相关，虽然磨损率随载荷增加而降低，但降低速率随时间减缓。润滑膜的形成有助于载荷均匀分布，磨损率与摩擦系数之间呈正相关。S-N曲线的拟合结果表明，镍基合金的疲劳寿命紧密遵循指数函数关系。本研究提供了关键的理论见解，以支持镍基合金在极端条件下（如核电系统中遇到的条件）的设计和应用。
