中国激光, 2020, 47 (1): 0102008, 网络出版: 2020-01-09   

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 下载: 1249次

Microstructure and High-Temperature Friction and Wear Properties of TiC/CaF2/Inconel 718 Composite Fabricated Using Laser Melting Deposition Technique
作者单位
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
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。
Abstract
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, and γ-(Ni, Fe). In-situ synthesized TiC primary phases and fine CaF2/TiC eutectics are uniformly scattered on a matrix of γ-(Ni, Fe) solid solution, which is strengthened by super-fine Cr7C3 and γ″-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.

刘志宏, 刘元富, 张乐乐, 陈德强, 石晨晓, 陆富刚, 冯志成, 金杰. 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[J]. 中国激光, 2020, 47(1): 0102008. Zhihong Liu, Yuanfu Liu, Lele Zhang, Deqiang Chen, Chenxiao Shi, Fugang Lu, Zhicheng Feng, Jie Jin. Microstructure and High-Temperature Friction and Wear Properties of TiC/CaF2/Inconel 718 Composite Fabricated Using Laser Melting Deposition Technique[J]. Chinese Journal of Lasers, 2020, 47(1): 0102008.

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