(1. 蘭州理工大學(xué) 甘肅省有色金屬新材料省部共建國家重點(diǎn)實(shí)驗(yàn)室，蘭州 730050；
2. 蘭州理工大學(xué) 有色金屬合金及加工教育部重點(diǎn)實(shí)驗(yàn)室，蘭州 730050)
摘 要: Co-Al-W合金是由γ′-Co3(Al,W)相沉淀強(qiáng)化的新型鈷基高溫合金。為了研究Co-Al-W合金在不銹鋼基體上TIG堆焊性能及堆焊層合金的耐磨性能，運(yùn)用TIG方法在304不銹鋼基體上堆焊Co-9Al-7.5W合金，用THT07-135型高溫摩擦磨損試驗(yàn)機(jī)、SEM等方法研究了堆焊層Co-9Al-7.5W合金與SiN圓環(huán)配磨的摩擦因數(shù)，并與相同條件下鈷基Stellite 6合金的摩擦磨損性能進(jìn)行了比較。結(jié)果表明：TIG堆焊Co-9Al-7.5W合金的最佳工藝參數(shù)為堆焊電流100 A，堆焊電壓12 V，熱輸入功率10.3 kJ/cm。此時(shí)，堆焊層7.5W合金表面的硬度高達(dá)HRC53.1。堆焊層7.5W合金的磨損質(zhì)量損失隨摩擦?xí)r間的增加而增大，平均摩擦因數(shù)為0.471，而相同條件下，Stellite 6合金的摩擦因數(shù)為0.531，故堆焊層7.5W合金的耐磨性能較好。堆焊層7.5W合金主要發(fā)生氧化磨損和磨粒磨損，但Stellite 6合金主要發(fā)生剝層磨損和磨粒磨損。
關(guān)鍵字: TIG堆焊；堆焊層Co-9Al-7.5W合金；摩擦磨損；機(jī)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
