激光熔覆制备CoCrFeNiMo/SiC涂层结构及摩擦性能分析  

Structure and Tribological Properties of Laser Cladding CoCrFeNiMo/SiC Coating

作　　者：杨长征[1] 时小广 郁录平[3] 曾庆仪 Yang Changzheng;Shi Xiaoguang;Yu Luping;Zeng Qingyi(Henan College of Transportation,College of Automobile,Zhengzhou,Henan450005,China;Department of Modern Manufacturing,Pingdingshan Technician College,Pingdingshan467000,China;College of Engineering Machinery,Chang′an University,Xi′an,Shaanxi 710064,China;Huadian Zhengzhou Machinery Design and Research Institute Co.Ltd.,Zhengzhou,Henan450000,China)

机构地区：[1]河南交通职业技术学院汽车学院,河南郑州450005 [2]平顶山技师学院现代制造系,河南平顶山467000 [3]长安大学工程机械学院,陕西西安710064 [4]华电郑州机械设计研究院有限公司,河南郑州450000

出　　处：《应用激光》2022年第5期135-140,共6页Applied Laser

基　　金：河南省高等学校青年骨干教师培养计划项目(2017GGJS241)。

摘　　要：以内燃机用45Cr钢为基底,通过激光熔覆制得加入SiC颗粒的CoCrFeNiMo/SiC高熵合金涂层,对比分析第1亚层CoCrFeNiMo(S1),第2亚层CoCrFeNiMo与10%SiC(S2),第3亚层CoCrFeNiMo与20%SiC(S3)的组织形态、力学特性与耐磨损性能的差异性与影响因素。研究结果表明:S2与S3试样中除FCC物相结构,还检测到了M_(7)C_(3)成分(M表示Cr、Mn、Fe)。S1涂层和基体间呈现圆弧结构的结合状态;S2涂层纵截面部位形成了良好结合状态;S3涂层中形成了厚度更小的第2亚层,涂层稀释率升高。在亚层内加入SiC后,生成了脆硬性M_(7)C_(3)产物,表现出更高的硬度。S1涂层磨损后发生了明显的磨粒磨损;S2涂层表面区域形成了更深的磨痕,发生了大片脱落;S3涂层形成更多大尺寸析出相,表现为磨粒磨损的特点。The CoCrFeNiMo/SiC high entropy alloy coating with SiC particles was prepared by laser cladding with 45Cr steel for internal combustion engine.The differences and influencing factors in microstructure,mechanical properties and wear resistance between the first CoCrFeNiMo(S1),the second CoCrFeNiMo and 10%SiC(S2),the third CoCrFeNiMo and 20%SiC(S3)were compared and analyzed.Results showed that in addition to FCC phase structure,M_(7)C_(3)components(M stands for Cr,Mn,Fe)were detected in S2and S3samples.There is a circular arc structure between S1coating and substrate.The longitudinal section of S2coating forms a good bonding state.The second sublayer with smaller thickness was formed in S3coating,and the coating dilution rate increased.After adding SiC into the sublayer,the brittle and hard M_(7)C_(3)products were formed,which showed higher hardness.Obvious abrasive wear occurred after S1coating wear.The surface area of S2coating formed deeper wear marks and a large amount of shedding occurred.S3coating formed more large size precipitates,which showed the characteristics of abrasive wear.

关 键 词：激光熔覆 高熵合金 梯度结构 维氏硬度 摩擦磨损 

分 类 号：TG146[一般工业技术—材料科学与工程]