激光熔覆Fe/NiCr-Cr_(3)C_(2)复合涂层的组织和磨损性能  

Microstructure and wear resistance of laser clad Fe/NiCr-Cr_(3)C_(2) composite coating

作　　者：夏同川 刘汀 张林[1] 方钊 李明喜[1,2] Xia Tongchuan;Liu Ting;Zhang Lin;Fang Zhao;Li Mingxi(Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Ma’anshan Anhui 243002,China;School of Materials Science and Engineering,Anhui University of Technology,Ma’anshan Anhui 243002,China;Maanshan Shenma Machinery Manufacturing Co.,Ltd.,Ma’anshan Anhui 243000,China)

机构地区：[1]安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室,安徽马鞍山243002 [2]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [3]马鞍山市申马机械制造有限公司,安徽马鞍山243000

出　　处：《金属热处理》2021年第5期196-202,共7页Heat Treatment of Metals

基　　金：安徽省重点研究与开发计划(1804a09020006)。

摘　　要：利用激光熔覆技术在GCr15钢表面制备Fe/NiCr-Cr_(3)C_(2)复合涂层,研究不同NiCr-Cr_(3)C_(2)含量对铁基涂层微观组织和磨损性能的影响。结果表明:随NiCr-Cr_(3)C_(2)含量的增多,复合涂层显微组织逐渐细化,在铁基合金里掺入NiCr-Cr_(3)C_(2)金属陶瓷粉末导致复合涂层里残留奥氏体含量增多,α-Fe相含量减少,截面硬度显著降低。当加入10%NiCr-Cr_(3)C_(2)时,复合涂层中出现较多的Cr_(3)C_(2)和Cr_(23)C_(6)硬质相,同时磨痕表面生成了具有减摩作用的氧化产物,从而降低了磨耗和摩擦阻力,使涂层表现出最佳的耐磨性能。Fe/NiCr-Cr_(3)C_(2) composite coating was prepared on GCr15 steel surface by laser cladding,and the effect of NiCr-Cr_(3)C_(2) on microstructure and wear resistance of the composite coating was investigated.The results indicate that the microstructure of the composite coating refines gradually with the increase of NiCr-Cr_(3)C_(2) content from 0 to 20%.With addition of NiCr-Cr_(3)C_(2) into the Fe-base alloy,the residual austenite content increases in the composite coating,while the α-Fe phase content decreases,resulting in the decrease of crosssection microhardness.The composite coating added with 10% NiCr-Cr_(3)C_(2) exhibits optimal wear resistance,and reduces the wear loss and friction resistance,which can be attributed to the formation of many hard carbide phases(Cr_(3)C_(2) and Cr_(23)C_(6))and oxide lubricating phase during wear process.

关 键 词：激光熔覆 Fe/NiCr-Cr_(3)C_(2)复合涂层 微观组织 耐磨性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]