(1. 湖南科技大学先进矿山装备教育部工程研究中心，湘潭 411201；
2. 中国科学院金属研究所，沈阳 110016)
摘 要: 研究K417G合金及其表面Ni(Co)CrAlYSi涂层在室温大气环境下的磨损特性。结果表明：K417G合金及其表面Ni(Co)CrAlYSi涂层的磨损受磨损亚表层疲劳脱层和磨损表面环境脆性的共同作用，致使其磨损率高于纯Ni的。在磨损过程中，环境脆性逐渐作用于磨损表面，磨损表面的裂纹源在γ/γ′界面以及碳化物与合金基体界面形核，裂纹既沿着γ/γ′面以及碳化物与合金基体界面扩展，又进入γ′晶粒，呈现沿晶和穿晶混合状。
关键字: K417G合金；Ni(Co)CrAlYSi涂层；Ni3Al；摩擦；磨损；环境致脆
（1. Engineering Research Center of Advanced Mining Equipment, Ministry of Education,
Hunan University of Science and Technology, Xiangtan 411201, China;
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The tribological properties of K417G superalloy and Ni(Co)CrAlYSi coatings/K417G were investigated at room temperature in atmospheric environment. The results show that the worn mechanism of both K417G superalloy and the coatings is due to interaction of environment embrittlement and fatigue delamination in subsurface stratum, which results to the higher wear rate compared with the pure nickel plate. The enviromental embrittlement gradually affect the worn surface during the process of wear. The formation of crack resource on the worn surface begins at both the interface of γ/γ′ phases and the interface of carbide and alloy. The cracks extend along both the interface of γ/γ′ phases and the interface of carbide and alloy and enter into the γ′ phase, presenting the intergranular and transgranular mixed.
Key words: K417G alloy; Ni(Co)CrAlY coatings; Ni3Al ; friction; wear; environmental embrittlement
