TiC含量对AlCoCrFeNi高熵合金熔覆层组织与耐磨性的影响  

Effect of TiC content on microstructure and wear resistance of AlCoCrFeNi high-entropy alloy clad layer

作　　者：张宏亮 王明欣 张京兵 李玉涛 金头男[2] Zhang Hongliang;Wang Mingxin;Zhang Jingbing;Li Yutao;Jin Tounan(Hengke IOT System Corporation of CMST,Zhengzhou Henan 450000,China;School of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China;Beijing Special Machinery Research Institute,Beijing 100143,China)

机构地区：[1]中储恒科物联网系统有限公司,河南郑州450000 [2]北京工业大学材料科学与工程学院,北京100124 [3]北京特种机械研究所,北京100143

出　　处：《金属热处理》2024年第9期275-279,共5页Heat Treatment of Metals

基　　金：北京市教委-市基金联合项目(KZ202210005004)。

摘　　要：利用激光熔覆法在40CrNiMo钢表面制备AlCoCrFeNi-2xMo-xTiC(x=0、0.1、0.25、0.4)高熵合金熔覆层,通过XRD、SEM、EBSD、TEM及耐磨性试验研究了TiC及Mo含量对AlCoCrFeNi-2xMo-xTiC熔覆层组织与耐磨性的影响。结果表明,当原位生成TiC后,熔覆层的显微组织有BCC和TiC相。随着TiC原子分数不断增加,碳化物析出相尺寸逐渐增大,熔覆层晶粒明显细化,晶粒尺寸由109μm变为15μm。AlCoCrFeNi-0.8Mo-0.4TiC熔覆层硬度最高,为750 HV0.3,相比AlCoCrFeNi熔覆层高300 HV0.3。TiC原子分数增加后熔覆层硬度和耐磨性都上升。AlCoCrFeNi熔覆层磨损表面磨屑较多,磨损机制是粘着磨损。AlCoCrFeNi-0.2Mo-0.1TiC、AlCoCrFeNi-0.5Mo-0.25TiC、AlCoCrFeNi-0.8Mo-0.4TiC熔覆层的磨损机理均为磨粒磨损。AlCoCrFeNi-2xMo-xTiC(x=0,0.1,0.25,0.4)high entropy alloy clad layer was prepared on 40CrNiMo steel surface by laser cladding method.The effect of TiC and Mo content on the microstructure and wear resistance of the AICoCrFeNi-2xMo-xTiC alloy clad layer was studied through XRD,SEM,EBSD,TEM,and wear resistance tests.The results show that after in-situ formation of TiC,the microstructure of the clad layer consists of BCC and TiC phases.As the atom fraction of TiC increases,the size of carbide precipitates gradually increases,and the grain size of the clad layer is significantly refined,decreasing from 109μm to 15μm.The AICoCrFeNi-0.8Mo-0.4TiC clad layer has the highest hardness of 750 HV0.3,which is 300 HV0.3 higher than the AICoCrFeNi alloy clad layer.The hardness and wear resistance of the clad layer increase with the increase of atom fraction of TiC.The wear surface of the AlCoCrFeNi alloy clad layer has more debris,and the wear mechanism is adhesive wear.The wear mechanism of the AICoCrFeNi-0.2Mo-0.1TiC,AICoCrFeNi-0.5Mo-0.25TiC,and AlCoCrFeNi-0.8Mo-0.4TiC alloy clad layers are abrasive wear.

关 键 词：高熵合金 激光熔覆 原位TiC强化 微观组织 耐磨性 

分 类 号：TG115.5[金属学及工艺—物理冶金]