(1. 兰州理工大学 甘肃省有色金属新材料省部共建国家重点实验室，兰州 730050；
2. 兰州理工大学 有色金属合金及加工教育部重点实验室，兰州 730050)
摘 要: Co-Al-W合金是由γ′-Co3(Al,W)相沉淀强化的新型钴基高温合金。为了研究Co-Al-W合金在不锈钢基体上TIG堆焊性能及堆焊层合金的耐磨性能，运用TIG方法在304不锈钢基体上堆焊Co-9Al-7.5W合金，用THT07-135型高温摩擦磨损试验机、SEM等方法研究了堆焊层Co-9Al-7.5W合金与SiN圆环配磨的摩擦因数，并与相同条件下钴基Stellite 6合金的摩擦磨损性能进行了比较。结果表明：TIG堆焊Co-9Al-7.5W合金的最佳工艺参数为堆焊电流100 A，堆焊电压12 V，热输入功率10.3 kJ/cm。此时，堆焊层7.5W合金表面的硬度高达HRC53.1。堆焊层7.5W合金的磨损质量损失随摩擦时间的增加而增大，平均摩擦因数为0.471，而相同条件下，Stellite 6合金的摩擦因数为0.531，故堆焊层7.5W合金的耐磨性能较好。堆焊层7.5W合金主要发生氧化磨损和磨粒磨损，但Stellite 6合金主要发生剥层磨损和磨粒磨损。
关键字: TIG堆焊；堆焊层Co-9Al-7.5W合金；摩擦磨损；机制
（1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,
Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Non-ferrous Metal Alloys and Processing,）
Abstract:Co-Al-W superalloy is strengthened by a ternary compound γ′-Co3(Al,W) phase with the precipitation strengthening on γ-Co matrix of novel Co-base superalloys. In order to research the welding performance of Co-9Al-7.5W (mole fraction, %) superalloy on the 304 stainless steel by TIG cladding, and the friction coefficient of Co-9Al-7.5W cladding layer superalloy mated with SiN ring was investigated by THT07-135 type friction and wear tester and SEM, which compare with cobalt-based Stellite 6 resistant alloy at the same conditions. The results show that TIG welding Co-9Al-7.5W superalloy optimum parameters are that the welding current is 100 A, welding voltage is 12 V, heat input is 10.3 kJ/cm, the surface hardness of 7.5W cladding layer superalloy reaches HRC53.1. The wear mass loss of 7.5W cladding layer superalloy increases with increasing wear time. The wear mass loss of 7.5W cladding layer is slightly larger than that of Stellite 6 alloy, but the friction coefficient of 7.5W cladding layer is obviously smaller than that of Stellite 6 alloy. The average friction coefficient of 7.5W cladding layer is 0.471. But the friction coefficient of Stellite 6 alloy is 0.531. The wear resistance of 7.5W cladding layer is better than that of Stellite 6 alloy. The 7.5W cladding layer is mainly oxidation and abrasive wear, but Stellite 6 alloy mainly occur delamination and abrasive wear.
Key words: TIG cladding; Co-9Al-7.5 W cladding layer superalloy; friction and wear; mechanism
