CAJ | 학술논문

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.
Co-Al-W 합금시유γ′-Co3(Al,W)상침정강화적신형고기고온합금.위료연구 Co-Al-W 합금재불수강기체상 TIG 퇴한성능급퇴한층합금적내마성능,운용 TIG 방법재304불수강기체상퇴한 Co-9Al-7.5W 합금,용THT07?135형고온마찰마손시험궤、SEM 등방법연구료퇴한층 Co-9Al-7.5W 합금여 SiN 원배배마적마찰인수,병여상동조건하고기 Stellite 6합금적마찰마손성능진행료비교.결과표명:TIG 퇴한 Co-9Al-7.5W 합금적최가공예삼수위퇴한전류100 A,퇴한전압12 V,열수입공솔10.3 kJ/cm.차시,퇴한층7.5W 합금표면적경도고체HRC53.1.퇴한층7.5W 합금적마손질량손실수마찰시간적증가이증대,평균마찰인수위0.471,이상동조건하, Stellite 6합금적마찰인수위0.531,고퇴한층7.5W 합금적내마성능교호.퇴한층7.5W 합금주요발생양화마손화마립마손,단 Stellite 6합금주요발생박층마손화마립마손.
@@@@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.