WC含量对铁基自熔合金涂层微观组织及性能的影响  

Effect of WC content on microstructure and properties of iron-based self-fusing alloy coating

作　　者：吴菲菲 张玺 刘曦茗 解芳[2,3] 翟长生 WU Feifei;ZHANG Xi;LIU Ximing;XIE Fang;ZHAI Changsheng(College of Mechanical and Electrical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China;Henan Province Engineering Research Center of Additive Manufacturing Aeronautical Materials,Nanyang Institute of Technology,Nanyang 473004,China;Nanyang Key Laboratory of Additive Manufacturing Technology and Equipment,Nanyang Institute of Technology,Nanyang 473004,China;Yanbai Intelligent Additive Manufacturing(Xuzhou)Technology Co.,Ltd.,Xuzhou 221116,China)

机构地区：[1]郑州轻工业大学机电工程学院,河南郑州450002 [2]南阳理工学院河南省增材制造航空材料工程研究中心,河南南阳473004 [3]南阳理工学院南阳市增材制造技术与装备重点实验室,河南南阳473004 [4]岩柏增材智造(徐州)科技有限公司,江苏徐州221116

出　　处：《电镀与涂饰》2025年第3期138-144,共7页Electroplating & Finishing

基　　金：国家自然科学基金(51605230);河南省重点研发与推广专项(科技攻关)(222102240002和232102221022);南阳市基础与前沿技术研究专项(23JCQY1001和23JCQY2013);南阳市重点研发专项(24ZDYF015);河南省研究生教育改革与质量提升工程项目(YJS2025AL148)。

摘　　要：[目的]以铁基自熔合金涂层来改善45钢的耐磨损性能。[方法]采用火焰喷涂−真空重熔复合工艺在45钢表面制备了不同配比的NF6铁基自熔合金+WC复合涂层。利用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度计及摩擦磨损试验机,探究了WC含量对复合涂层表面形貌、元素分布、物相组成、显微硬度及摩擦磨损行为的影响。[结果]NF6铁基自熔合金+WC复合涂层由富Cr树枝晶和富Fe、Si、W的基体组成,生成了Cr_(7)C_(3)、Fe_(2)Si、WC、W_(2)C、Ni–Cr–Fe、Fe–Cr等硬质相。WC含量增加有利于提高涂层的显微硬度和耐磨性,使涂层的磨损机制由粘着磨损转变为磨粒磨损。但WC含量过高时涂层界面结合效果变差,涂层一侧出现明显的未熔合裂纹和未熔化颗粒,造成显微硬度和耐磨性下降。WC含量为15%时,涂层的平均显微硬度约为1079.15 HV0.5,摩擦因数约为0.58。[结论]适宜的WC含量有利于获得综合性能较好的铁基自熔合金复合涂层。[Objective]Using an iron-based self-fluxing alloy coating to improve the wear resistance of 45 steel.[Method]The NF6 iron-based self-fusing alloy+WC composite coatings with different proportions were prepared on the surface of 45 steel by flame spraying and vacuum remelting.The effect of WC content on the surface morphology,element distribution,phase composition,microhardness,and friction and wear behavior of the composite coatings was studied by using scanning electron microscope(SEM),energy-dispersive spectrometer(EDS),X-ray diffractometer(XRD),microhardness tester,and tribometer.[Result]The NF6 iron-based self-fusing alloy+WC composite coating was composed of Cr-rich dendrites and a matrix rich in Fe,Si,and W,with the formation of hard phases such as Cr_(7)C_(3),Fe_(2)Si,WC,W_(2)C,Ni-Cr-Fe,and Fe-Cr.The increase of WC content was beneficial to improve the microhardness and wear resistance of the coating,causing the wear mechanism to transition from adhesive wear to abrasive wear.However,an excessively high WC content led to poor interfacial bonding,resulting in visible unmelted cracks and particles at the coating side adjacent to the interface,which reduced the microhardness and wear resistance.The coating with 15%of WC had an average microhardness of about 1079.15 HV0.5 and a friction factor of about 0.58.[Conclusion]Proper WC content is beneficial to obtain an iron-based self-fusing alloy composite coating with superior comprehensive properties.

关 键 词：碳钢 铁基自熔合金 碳化钨 复合涂层 显微硬度 摩擦磨损行为 

分 类 号：TG174.45[金属学及工艺—金属表面处理]