激光熔化沉积TiC/CaF2/Inconel 718复合材料的组织及高温摩擦磨损性能  

Microstructure and High-Temperature Friction and Wear Properties of TiC/CaF2/Inconel 718 Composite Fabricated Using Laser Melting Deposition Technique

作　　者：刘志宏 刘元富[1,2] 张乐乐 陈德强[2] 石晨晓 陆富刚 冯志成 金杰 Liu Zhihong;Liu Yuanfu;Zhang Lele;Chen Deqiang;Shi Chenxiao;Lu Fugang;Feng Zhicheng;Jin Jie(School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing100044,China;National and Local Joint Engineering Laboratory for High-End Bearing Tribology Technology and Application,Henan University of Science and Technology,Henan,Luoyang471023,China)

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044 [2]河南科技大学高端轴承摩擦学技术与应用国家地方联合工程实验室,河南洛阳471023

出　　处：《中国激光》2020年第1期121-127,共7页Chinese Journal of Lasers

基　　金：清华大学摩擦学国家重点实验室开放基金(SKLTKF17B06);高端轴承摩擦学技术与应用国家地方联合工程实验室开放基金(201904);中央高校基本科研费专项资金(2019ZBJ106)。

摘　　要：采用激光熔化沉积技术制备了TiC/CaF2/Inconel 718高温合金基高温耐磨自润滑复合材料,对其显微组织、显微硬度及高温干滑动摩擦磨损性能进行了研究,探讨了其高温磨损机理。结果表明:复合材料的显微组织由TiC、CaF2、Cr7C3、γ″-Ni3Nb和γ-(Ni,Fe)构成,原位自生TiC初生相和细小CaF2/TiC共晶弥散分布在被Cr7C3和γ″-Ni3Nb等超细高温相强化的γ-(Ni,Fe)固溶体基体上;复合材料的平均显微硬度为820 HV;与激光熔化沉积Inconel 718对比样相比,复合材料具有良好的高温耐磨性及低且稳定的摩擦因数,复合材料优异的高温摩擦磨损性能源自于其合理的显微组织结构。A high-temperature wear-resistant self-lubricating composite based on TiC/CaF2/Inconel 718 superalloy is fabricated using the laser melting deposition technique.The composite′s microstructure,microhardness,and high-temperature dry-sliding friction and wear properties are investigated.Furthermore,its high-temperature wear mechanism is studied.The results demonstrate that the composite′s microstructure comprises TiC,CaF2,Cr7C3,γ″-Ni3Nb,andγ-(Ni,Fe).In-situ synthesized TiC primary phases and fine CaF2/TiC eutectics are uniformly scattered on a matrix ofγ-(Ni,Fe)solid solution,which is strengthened by super-fine Cr7C3 andγ″-Ni3Nb high-temperature strengthening phases.The composite′s average microhardness is approximate 820 HV.Compared with the Inconel 718 reference specimen fabricated by laser melting deposition technique,the composite has good high-temperature wear-resistance and a low and stable friction coefficient.The composite′s excellent high-temperature friction and wear properties are derived from its reasonable microstructure.

关 键 词：激光技术 激光熔化沉积 INCONEL 718 显微组织 自润滑 摩擦磨损 

分 类 号：TN249[电子电信—物理电子学] TG146.2[一般工业技术—材料科学与工程]