Fe基氩弧重熔涂层的制备及其磨损性能研究  

Preparation and Wear Properties of Fe-based Argon Arc Remelting Coating

作　　者：董天顺[1] 郑晓东[1] 孟宏杰[2] 付彬国 李国禄[1] 李亚龙 DONG Tian-shun;ZHENG Xiao-dong;MENG Hong-jie;FU Bin-guo;LI Guo-lu;LI Ya-long(School of Material Science and Engineering,Hebei University of Technology,Tianjin300130,China;Department of Mechanical Engineering,Tangshan Industrial Vocational Technical College,Tangshan063299,China)

机构地区：[1]河北工业大学材料科学与工程学院,天津300130 [2]唐山工业职业技术学院机械工程系,唐山063299

出　　处：《表面技术》2018年第12期155-165,共11页Surface Technology

基　　金：国家自然科学基金项目(51675158);河北省自然科学基金项目(E2016202325)~~

摘　　要：目的制备高质量的Fe基氩弧重熔涂层,并探究氩弧重熔处理对涂层在不同载荷作用下磨损性能的影响。方法通过正交试验对Fe基重熔层的4个主要重熔参数(电流、速度、弧长、步长)进行优化设计,采用孔隙率和显微硬度作为指标来综合评价涂层的质量。利用X射线衍射仪对涂层进行物相分析,利用UMT-3多功能摩擦磨损试验机测试涂层的耐磨性,利用白光干涉三维表面轮廓仪对磨痕进行表征,利用扫描电镜分析了粉末形貌、涂层的微观结构和涂层的失效形貌。结果通过正交试验获得了高质量的Fe基氩弧重熔涂层,其最优重熔工艺参数为:重熔电流70 A,速度200 mm/min,弧长2 mm,步长2 mm。随着磨损载荷的增加,喷涂层和重熔层的摩擦系数均增大,但在相同的载荷作用下,重熔层的摩擦系数小于喷涂层。喷涂层的主要失效模式为剥落和磨粒磨损,呈现出脆性断裂特征;重熔层的主要失效形式为粘着磨损和疲劳磨损,呈现出塑性变形和犁沟特征。在10、20、30、40 N载荷作用下,重熔层的磨损体积分别比喷涂层降低了32.1%、51.5%、60.7%和55.7%。结论通过氩弧重熔处理,得到了高质量的Fe基重熔层,与原Fe基喷涂层相比,其显微组织和耐磨性得到显著改善。The work aims to prepare high quality Fe-based argon arc remelting coating and study the effect of argon arc remelting treatment on the wear properties of as-sprayed coating under different loads.Four main remelting parameters(current,velocity,arc length and step length)of Fe-based remelted coating were optimized by orthogonal test,and the porosity and microhardness were used as indicators to comprehensively evaluate the quality of Fe-based remelted coating.The phase composition of the coating was evaluated by X-ray diffraction,the wear resistance of the coating was tested by UMT-3 multi-function friction and wear tester,and wear scar was characterized by three dimensional surface profiler.The morphology of the powders,the microstructure of the coating and the failure morphology of the coatings were analyzed by scanning electron microscope(SEM).High quality Fe-based argon arc remelting coating could be obtained by orthogonal test,and the three main parameters optimized by orthogonal test were current of 70 A,speed of 200 mm/min,arc length of 2 mm and step length of 2 mm.With the increase of the experimental load,the friction coefficient of the as-sprayed coating and the remelted coating increased.While,the friction coefficient of the remelted coating was smaller than that of the as-sprayed coating under the same experimental load.The main failure modes of the as-sprayed coating were spalling and abrasive wear,showing the characteristics of brittle fracture.The main failure modes of the remelted coating were adhesive wear and fatigue wear,displaying the characteristics of plastic deformation and pear gully.The wear volume of the remelted coating respectively decreased by 32.1%,51.5%,60.7%and 55.7%than the as-sprayed coating under the load of 10、20、30 and 40 N.Therefore,the microstructure and wear resistance of Fe-based coating are greatly improved by argon arc remelting treatment,when compared with original Fe-based coating.

关 键 词：Fe基涂层 氩弧重熔 正交优化 磨损性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]