W1813N无磁不锈钢表面激光熔覆Ni60与WC-12Co/Ni25涂层的组织结构和磨损行为（英文）  

Microstructure and Wear Behavior of Hard Ni60 and Soft WC-12Co/Ni25 Coatings Prepared by Laser Cladding on W1813N Non-magnetic Stainless Steel

作　　者：杨理京 张平祥[1] 王少鹏[1] 李争显[1] 王培[1] 李欢[1] 杨海彧[1] Yang Lijing;Zhang Pingxiang;Wang Shaopeng;Li Zhengxian;Wang Pei;Li Huan;Yang Haiyu(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]西北有色金属研究院

出　　处：《稀有金属材料与工程》2019年第11期3441-3447,共7页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51701165);China Postdoctoral Science Foundation(2017M623334XB);Natural Science Foundation of Shaanxi Province(2018JM5005);Shaanxi Postdoctoral Science Foundation(2018BSHQYXMZZ36)

摘　　要：利用激光熔覆技术在W1813N无磁性不锈钢表面分别制备高硬度镍基自熔性合金Ni60(60HRC)涂层和低硬度Ni25基WC-12Co复合涂层。利用扫描电子显微镜(SEM)、能谱(EDS)、X射线衍射仪(XRD)和台阶仪,分析激光熔覆制备Ni60涂层和WC-12Co/Ni25复合涂层的显微组织、相组成和磨损行为。利用显微硬度、摩擦系数、磨痕轮廓对比2种涂层的耐磨性和磨损机制。结果表明,Ni60涂层显微组织主要为树枝晶和等轴晶,且Cr23C6,Cr2B等强化相弥散分布在γ-Ni和Fe Ni固溶体晶界;而WC-12Co/Ni25复合涂层中WC-12Co颗粒弥散镶嵌于低硬度Ni25基质,复合涂层中WC-12Co颗粒体积分数达到32.5 vol%。复合涂层中最大和最小显微硬度差异达到6480MPa。尽管2种涂层的摩擦系数相近,但复合涂层的磨损体积仅为Ni60涂层的10%,Ni60涂层表面的磨痕特征为犁沟状和塑性粘附,复合涂层磨痕表面为WC碎屑和塑性粘附,因此Ni60涂层的磨损机制为磨粒磨损和粘着磨损,而复合涂层磨损机制为粘着磨损。以上结果表明WC-12Co/Ni25复合涂层具有更好的耐磨性。The hard Ni60(60 HRC)self-fluxing alloy powder and soft Ni25-based WC-12 Co composite powder were separately deposited onto the W1813 N non-magnetic stainless steel using laser cladding(LC).The microstructure,phase composition and worn track characteristics of the Ni60 coating and WC-12 Co/Ni25 composite coating were analyzed using scanning electron microscopy(SEM),energy dispersive spectrum(EDS),X-ray diffraction(XRD)and a step profiler.The micro-hardness,friction coefficient,profile of worn track and wear mechanism of both coatings were investigated.The results show that the microstructure is mainly fine dendrite and equiaxed crystal in the LC Ni60 coating,and the hard Cr23 C6 and Cr2 B phases are distributed in the grain boundary ofγ-Ni and Fe Ni solid solution,while WC-12 Co particles in the composite coating are uniformly embedded in the Ni25 matrix,and the volume fraction of WC-12 Co in the composite coating is 32.5 vol%.The difference value between minimum and maximum hardness in the WC-12 Co/Ni25 composite coating reaches 6480 MPa.Although the mean friction coefficients of both coatings are similar,the volume loss of the LC WC-12 Co/Ni25 is only 10%of that of the LC Ni60.The surface abrasive behaviors of the LC Ni60 coating are ploughed shape and adhesive scraps,but the surface abrasive behaviors of the LC WC-12 Co/Ni25 composite coating are adhesive scraps and WC debris.The wear mechanism of the Ni60 coating is abrasive wear and adhesive wear,while the wear mechanism of the WC-12 Co/Ni25 coating is adhesive wear.These demonstrate that the WC-12 Co/Ni25 coating exhibits better wear resistance than the LC Ni60.

关 键 词：镍基合金 WC-12Co陶瓷 激光熔覆 复合涂层 耐磨性 

分 类 号：TG1[金属学及工艺—金属学]