车用316L不锈钢表面NV复合涂层的结构和耐磨性能分析  

Structure and Wear Resistance of NV Composite Layer on Automobile Stainless Steel

作　　者：张亚标[1] 李勇峰[2] 李明 ZHANG Ya-biao;LI Yong-feng;LI Ming(Department of Mechanical Manufacturing,Xinxiang Vocational and Technical College,Xinxiang 453000,China;College of Mechanical and Electrical Engineering,Henan University of Science and Technology,Xinxiang 453000,China;Xinxiang Xinneng Electric Vehicle Co.,Ltd.,Xinxiang 453000,China)

机构地区：[1]新乡职业技术学院机械制造系,河南新乡453000 [2]河南科技学院机电学院,河南新乡453000 [3]新乡市新能电动汽车有限公司,河南新乡453000

出　　处：《材料保护》2021年第3期121-125,共5页Materials Protection

基　　金：河南省职业教育教学改革项目(ZJC17040)资助。

摘　　要：为了提高车用316L不锈钢的表面质量,综合运用粉末渗钒以及盐浴渗氮工艺在其表面制备单渗钒、先渗钒后渗氮(N/V)以及先渗氮后渗钒(V/N)涂层,并通过SEM、EDS、XRD、硬度测试仪、摩擦试验机等分析了其微观组织结构和耐磨性能。结果表明:相对单V涂层而言,N/V和V/N涂层(统称NV涂层)的表面更为光滑,主要包含NV(111)与α-Fe2种物相组织。其中V/N涂层中N元素含量较高,涂层表面富集了大量的Fe。V/N涂层硬度(1691 HV)高于N/V涂层硬度(1546 HV),两者的硬度均比单V层的高,并且涂层硬度均远高于不锈钢基体的硬度。与其他涂层相比,V/N涂层具有更小的摩擦系数(0.26),可以快速形成稳定磨损状态,其摩擦系数变化曲线相对平缓。V/N涂层与基体形成紧密结合状态,其磨痕深度较低并避免了犁沟的产生。In order to improve the surface quality of 316 L stainless steel for vehicles,the powder vanadizing and the salt bath nitriding technology were used to prepare the coatings of single powder vanadizing,powder vanadizing followed by nitriding(N/V),and nitriding followed by powder vanadizing(V/N)on the surface of 316 L stainless steel.The microstructure and wear resistance were analyzed by SEM,EDS,XRD,hardness tester and friction tester.Results showed that compared with single V coating,NV coating had a smoother surface,mainly containing NV(111)andα-Fe.The V/N coating had a high content of N element,and a large amount of Fe was formed on the surface of the coating.The hardness of the V/N coating(1691 HV)was higher than that of the N/V coating(1546 HV).The hardness of V/N and N/V coatings was higher than that of single vanadium coating.The hardness of the coatings were much higher than that of the 316 L stainless steel substrate.Compared with other coatings,the V/N coating had a smaller friction coefficient,only 0.26,which could quickly form a stable wear state,and forming a relatively gentle friction coefficient change curve.V/N coating was closely bound to the substrate and the depth of the wear scar is low,which avoided the generation of furrow.

关 键 词：渗钒 渗氮 316L不锈钢 微观组织 耐磨性能 

分 类 号：TG156.8[金属学及工艺—热处理]