镍包SiCp增强Ni35合金激光熔覆层的显微组织及摩擦磨损性能  

Microstructure and Friction and Wear Performance of Ni35 Alloy Laser-Cladding Layer Reinforced by Ni-Coated SiC_p

作　　者：白炎 潘成刚[1] 丁紫正 BAI Yan;PAN Chenggang;DING Zizheng(Key Laboratory {or Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;Guangzhou JFE Steel Sheet Company Ltd.,Guangzhou 511464,China)

机构地区：[1]武汉科技大学,钢铁冶金及资源利用教育部重点实验室,武汉430081 [2]广州JFE钢板有限公司,广州511464

出　　处：《机械工程材料》2018年第10期34-40,45,共8页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51375353)

摘　　要：采用激光熔覆工艺在H13模具钢基体表面制备镍包SiC_p增强Ni35合金熔覆层,研究了熔覆层的显微组织以及在25,600℃下的摩擦磨损性能。结果表明:熔覆层由γ-Ni(Fe)+M_3(B,Si)共晶相、M_(23)C_6型碳化物、M_7C_3型碳化物、Ni_(31)Si_(12)镍硅化物和石墨组成;在不同温度下摩擦磨损后,熔覆层表面的显微硬度均高于基体的,磨损体积小于基体的;25℃下熔覆层的耐磨性能较基体的明显提高,且提高效果高于600℃下的;25℃下熔覆层的磨损机制主要为微磨粒磨损和黏着磨损,600℃下的则主要为磨粒磨损、黏着磨损以及轻微的氧化磨损。Ni-coated SiCpreinforced Ni35 alloy laser-cladding layer was prepared on surface of H13 die steel substrate by laser cladding technique.The microstructure and the friction and wear performance at 25,600℃of the cladding layer were studied.The results show that the cladding layer was composed ofγ-Ni（Fe）＋ M3（B,Si）eutectic phase,M（23） C6 carbide,M7 C3 carbide,Ni（31） Si（12） nickel-silicide,and graphite.After friction and wear at different temperatures,the cladding layer had a higher surface microhardness and a lower wear volume than the substrate.The wear resistance at 25 ℃ of the cladding layer was improved greatly comparing with that of the substrate,and the improvement effect was higher than that at 600℃.The wear mechanism at 25℃of the cladding layer was mainly micro-abrasive wear and adhesive wear,while that at 600℃ was abrasive wear,adhesive wear and slight oxidation wear.

关 键 词：激光熔覆 镍包SiCp Ni35合金 摩擦磨损性能 显微组织 

分 类 号：TG142.33[一般工业技术—材料科学与工程] TH117[金属学及工艺—金属材料]