第31卷第3期2023年6月D0I:10.11951/j.issn.1005-0299.20220087材料科学与工艺MATERIALSSCIENCEANDTECHNOLOGYVol.31No.3Jun.202345钢表面激光熔覆覆CoCrNi中熵合金涂层组织与性能陈凯，崔承云,赵恺，姜高强（江苏大学机械工程学院，江苏镇江212013）摘要：为探究CoCrNi中合金在激光熔覆领域中的应用，以CoCrNi合金粉末作为熔覆粉末，在45钢表面采用同轴送粉法制备合金涂层。利用扫描电镜、X射线衍射仪、显微硬度仪、摩擦磨损实验机和电化学工作站等设备研究了熔覆层微观组织、硬度、耐磨性和耐腐蚀性能。结果表明：熔覆层成形良好，组织均匀致密，组成相主要为FCC单相固溶体；熔池与基体交界处为平面晶，底部靠近中心为柱状晶，顶部分别为胞状晶和等轴晶，3种元素在熔覆层深度方向上的比例几乎相同；熔覆层平均硬度为250HV，摩擦系数、磨损量较基体分别降低了11.7%和36.7%；自腐蚀电流密度略有降低CoCrNi熔覆层的钝化区域为-150到1100mV,表明熔覆层显著提高45钢的耐腐蚀性能。关键词：激光熔覆；CoCrNi中炳合金；45钢；组织；性能中图分类号：TN174文献标志码：A文章编号：1005-0299(2023)03-0048-08MicrostructureandpropertiesoflasercladdingCoCrNimedium-entropyalloycoatingon45steelCHENKai,CUIChengyun,ZHAOKai,JIANGGaoqiang(SchoolofMechanicalEngineering,JiangsuUniversity,Zhenjiang212013,China)Abstract:ToexploretheapplicationofCoCrNimedium-entropyalloyinthefieldoflasercladding,wepreparedalloycoatingonthesurfaceof45steelbycoaxialpowderfeedingmethodwithCoCrNialloypowderascladdingpowder.Themicrostructure,hardness,wearresistance,andcorrosionresistanceofthecladdinglayerwereinvestigatedbyscanningelectronmicroscopy,X-raydiffraction,microhardnesstester,frictionandweartester,andelectrochemicalworkstation.Resultsshowthatthecladdinglayerwaswellformed,themicrostructurewasuniformanddense,andtheconstituentphasewasmainlyFCCsingle-phasesolidsolution.Theinterfacebetweenthemoltenpoolandthesubstratewasplanecrystal,thebottomnearthecenterwascolumnarcrystal,andthetopwascellularcrystalandequiaxedcrystalrespectively.Theproportionsofthethreeelementsinthedepthdirectionofthecladdinglayerwerealmostthesame.Theaveragehardnessofthecladdinglayerwas250HV,andthefrictioncoefficientandw...
