热处理温度对300M钢表面WC-10Co4Cr涂层结构及磨损特性的影响  

Effects of heat treatment temperature on the structure and wear behavior of WC-10Co4Cr coatings deposited on 300M steel

作　　者：马运柱[1] 孟尚儒 刘文胜[1] 刘阳[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2017年第6期815-821,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：湖南有色研究基金项目(YSZN2013CL03)

摘　　要：采用高速火焰喷涂法(HVAF)在300M钢表面制备WC-10Co4Cr涂层,在真空炉中分别进行900,1 000和1 100℃保温1 h的热处理。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、显微硬度计和UMT-3摩擦试验机等手段对热处理后涂层相结构、显微组织、显微硬度和滑动磨损特性进行表征。研究结果表明:在三种温度下热处理时,涂层中WC、W_2C和Co逐渐转变为Co_3W_3C和Co_6W_6C两种η相;随着热处理温度从900℃提升到1 100℃,Co_6W_6C相逐渐增多,涂层显微硬度先升高后降低;经过1 000℃保温1 h热处理后的涂层硬度达到1 342 HV,在实验载荷20 N,滑动速度600 r/min条件下滑动磨损1 800 s后磨损质量损失为2.93 mg。涂层经1 000℃保温1 h的热处理后拥有最佳的综合性能。The WC-10Co4Cr coating was deposited on 300M steel by high velocity air fuel spraying processes （HVAF）. The heat treatments were carried out on the samples under 900, 1 000 and 1 100 ℃ for 1 h in vacuum furnace, respectively. The phase structure, microstructure, micro-hardness and sliding wear of the coatings after heat treatment were investigated by X-Ray Diffraction （XRD）, scanning electron microscope （SEM）, microhardness tester and UMT-3 friction testing machine. The results show that WC, W2C and Co phases change to new phases （Co3W3C and Co6W6C） after the heat treatment. With increasing temperature, the content of Co6W6C phase increases, the microhardness of the coating increases first and then decreases. The microhardness is 1 342 HV and the wear weight loss is 2.93 mg when the experimental load is 20 N, sliding speed is 600 r/min for 1 800 s after 1 000 ℃ heat treatment for 1 h. The coating after heat treatment at 1 000 ℃ for 1 h shows better comprehensive performance than that in other conditions.

关 键 词：高速火焰喷涂 热处理 WC-10Co4Cr 300M钢 磨损性能 

分 类 号：TF125.32[冶金工程—粉末冶金]