摘要
为了提高轴承用304H不锈钢耐磨性,采用等离子堆焊在不锈钢表面制备Stellite6合金堆焊层,研究了堆焊层微观组织及高温耐磨性能,分析了不同温度对耐磨性能的影响。结果表明,堆焊层与基体结合良好,Stellite6合金堆焊层以柱状晶为主,熔合区为平面晶区。堆焊层主要由γ-Co固溶体和Cr、Ni、W及C元素形成的M7C3型复合碳化物以及WC组成。从基体到堆焊层硬度值不断增加,距熔合线0.2 mm后堆焊层硬度进入稳定区,硬度值(HV)高于460。在250、350、450和500℃与Stellite21堆焊层对磨时,Stellite6堆焊层摩擦因数与磨损质量损失随着磨损温度的增加而增加,摩擦面粗糙度在3.9~8.6μm之内。堆焊层高温磨损机制为磨粒磨损、粘着磨损以及氧化磨损,且随温度升高,磨损程度加剧,但磨损机制没有明显改变。
Stellite6 alloy surfacing layers were prepared on the surface of 304H stainless steel for hydrostatic guide bearing of nuclear power by plasma surfacing technology.Microstructure and wear resistance of the cobalt-based surfacing layers were investigated.The effects of different friction temperatures and time on the wear properties of plasma surfacing Stellite6 alloy were analyzed.The results show that surfacing layer presents good metallurgical bonding with the base metal.The microstructure of the surfacing layer of Stellite6 is mainly composed of columnar crystal,and the fusion zone is a planar crystal zone.The surfacing layer is mainly composed of M,Cs composite carbides with Cr,Ni,W and C elements,WC and-Co solid solution.From the substrate to the surfacing layer,the hardness is increased.After O.2 mm from the fusion line,the hardness of the surfacing layer enters the stable zone,which is higher than 460 HV.When Stellite6 overlay was worn at 250,350,450 and 500℃with Stellite2l overlay,the wear rate and surface roughness are increased with the increase of temperature.The surface roughness of the friction surface is 3.9~8.6μm.The main wear mechanism is characterized by abrasive wear,accompanied with adhesive wear and oxidation wear.With the increase of temperature,the wear degree is increased,however the wear mechanism keeps stable.
作者
关锰
雍兴平
田云
邹有序
林雪健
黄宏军
Guan Meng;Yong Xingping;Tian Yun;Zou Youxu;Lin Xuejian;Huang Hongjun(Shenyang Blower Group Nuclear Power Pump Co.,Ltd.;School of Materials Science and Engineering,Shenyang University of Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2023年第6期815-820,共6页
Special Casting & Nonferrous Alloys
