TiC含量对激光熔覆Inconel 718复合涂层组织和性能的影响  

Effects of TiC content on microstructures and properties of laser cladding Inconel 718 composite coatings

作　　者：卢盛儒 仝永刚 胡永乐[1] 伍鹏飞 吉希希 王开明 LU Shengru;TONG Yonggang;HU Yongle;WU Pengfei;JI Xixi;WANG Kaiming(College of Automotive and Mechanical Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学汽车与机械工程学院,长沙410114

出　　处：《粉末冶金材料科学与工程》2025年第1期11-21,共11页Materials Science and Engineering of Powder Metallurgy

基　　金：湖南省科技创新计划资助项目(2021RC3096);湖南省教育厅科学研究项目(23A0264);湖南省自然科学基金资助项目(2023JJ30038)。

摘　　要：为提高镍基合金熔覆层的高温耐磨性,本文采用激光熔覆技术制备TiC强化Inconel 718复合熔覆层,通过扫描电子显微镜、能谱仪、超景深显微镜和球-盘式高温摩擦磨损试验机等,探究TiC含量对Inconel 718复合熔覆层组织结构及高温摩擦行为的影响。结果表明:加入TiC后,复合熔覆层内部形成(Nb,Ti)C、NbC和不同尺度的Ti C颗粒,复合熔覆层的晶粒细化。w(TiC)=30%的复合熔覆层硬度(HV0.2)最高,达到660.0,相较于Inconel 718熔覆层(264.0)提升了150.0%;在室温条件下,复合熔覆层的体积损失量相较于Inconel 718熔覆层降低了93.4%;在高温环境下,复合熔覆层仍具有优异的耐磨性能,体积损失量为0.83×10^(8)μm^(3)。随Ti C含量增加,熔覆层的磨损机制由磨料磨损转变为黏着磨损。熔覆层的硬度和室温与高温耐磨性能的提升归因于不同尺度碳化物增强相的形成和晶粒细化。In order to improve the high-temperature wear resistance of nickel-base alloy cladding,this paper employs laser cladding technology to prepare TiC reinforced Inconel 718 composite cladding layers,and investigats the effects of TiC content on the microstructures and high-temperature friction behaviour of Inconel 718 composite cladding layer by scanning electron microscope,energy spectrometer,super depth of field microscope,and ball-disc high temperature friction and wear test machine.The results show that the addition of TiC results in the formation of(Nb,Ti)C,NbC,and different scale TiC particles,the grains of the composite cladding layers are refined.The composite cladding layer with w(TiC)=30%has the highest hardness(HV0.2)of 660.0,which is 150.0%higher than that of the Inconel 718 cladding layer(264.0);at room temperature,the volume loss of the composite cladding layer is 93.4%lower than that of the Inconel 718 cladding layer;and at high temperature,the composite cladding layer still has excellent wear resistance with a volume loss of 0.83×10^(8)μm^(3).The wear mechanism of cladding layers change from abrasive wear to adhesive wear with the increace of TiC content.The improvement in hardness and room and high temperature wear resistance of the cladding layers is attributed to the formation of different scale carbide-reinforced phases and grain refinement.

关 键 词：激光熔覆 Incone 718 体积损失量 磨损机制 复合熔覆层 

分 类 号：TG156.8[金属学及工艺—热处理]