Ni-WB_(2)复合熔覆层的微观组织及摩擦磨损性能  

Microstructure and wear performance of Ni-WB_(2) composite clad layer

作　　者：刘凌波 杨贵荣[1] 宋文明 李亚敏[1] 马颖[1] Liu Lingbo;Yang Guirong;Song Wenming;Li Yamin;Ma Ying(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou Gansu 730050,China;Lanpec Technologies Co.,Ltd.,Lanzhou Gansu 730070,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]甘肃蓝科高新石化装备股份有限公司,甘肃兰州730070

出　　处：《金属热处理》2023年第1期207-216,共10页Heat Treatment of Metals

基　　金：国家自然科学基金(51765035,51205178);辽宁省航发材料摩擦学重点实验室开放课题(LKLAMTF202201)。

摘　　要：利用真空熔覆技术在45钢表面制备了Ni-WB_(2)复合熔覆层,利用SEM、EDS、XRD等分析其组织特征,利用销盘式摩擦试验机对其摩擦磨损性能进行了测试与分析。结果表明,Ni-WB_(2)复合熔覆层组织致密并与基体呈牢固的冶金熔合,熔覆层具有特殊的分层结构,分为网状结构层、过渡结构层和扩散熔合层,网状复合区又分为网状Ⅰ区和网状Ⅱ区。扩散区主要由铁基固溶体和镍基固溶体构成,过渡区的主要组成相为γ-Ni及Cr的碳化物,网状复合区的主要组成相有镍基合金、铬碳化物、WB_(2)、镍硅共晶以及WB_(2)与镍基合金中的元素形成的复杂硼化物和碳化物。当WB_(2)含量低于20%时,随着WB_(2)在复合熔覆层中含量的增加,其磨损率及摩擦因数均逐渐降低,当WB_(2)含量为15%时,Ni-WB_(2)复合熔覆层的磨损率及摩擦因数与基体相比,分别降低了48.94%与14.62%。网状分布的硬质相在摩擦过程中起到支撑载荷的作用,摩擦磨损过程中形成了WOx氧化物,均有利于降低复合熔覆层的摩擦磨损。Ni-WB_(2)composite clad layer was prepared on the 45 steel substrate through vacuum cladding technology.The microstructure of the clad layer was characterized by means of SEM,EDS and XRD,and wear performance was studied by using pin-disc type wear apparatus.The results show that the Ni-WB_(2)composite clad layer is dense,and a strong metallurgical bond formed at the interface between the clad layer and the substrate.The clad layer can be subdivided into reticular zone,transition zone and diffusion zone based on its microstructure,and the reticular composite zone is divided into areaⅠand areaⅡ.The diffusion zone is mainly composed of Fe-based solid solution and Ni-based solid solution.The main phases of the transition zone areγ-Ni and chromium carbide,and the main compositions of the reticular composite zone are Ni-based alloy,chromium carbide,WB_(2),nickel silicon eutectic and complex comppund formed owing to the chemical combination between the WB_(2)and elements of nickel-based alloy.When the WB_(2)content is lower than 20%,both the wear rate and friction factor of the Ni-WB_(2)composite clad layer decrease gradually with the increase of WB_(2)content.When the WB_(2)content is 15%,the wear rate and friction factor of Ni-WB_(2)composite clad layer decrease by 48.94%and 14.62%respectively compared with that of the 45 steel substrate.During the wear process,the load supporting effect of the hard phase with network distribution and the formation of WOxoxide are conducive to reduce the friction and wear of the Ni-WB_(2)composite clad layer.

关 键 词：真空熔覆 Ni-WB_(2)复合熔覆层 网状复合层 摩擦磨损行为 

分 类 号：TG178[金属学及工艺—金属表面处理]