Chinese Journal of Lasers, Volume. 47, Issue 1, 0102008(2020)

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

Zhihong Liu1, Yuanfu Liu1,2、*, Lele Zhang1, Deqiang Chen2, Chenxiao Shi1, Fugang Lu1, Zhicheng Feng1, and Jie Jin1
Author Affiliations
  • 1School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
  • 2National and Local Joint Engineering Laboratory for High-End Bearing Tribology Technology and Application, Henan University of Science and Technology, Henan, Luoyang 471023, China
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    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.

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    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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    Paper Information

    Category: laser manufacturing

    Received: Aug. 7, 2019

    Accepted: Oct. 9, 2019

    Published Online: Jan. 9, 2020

    The Author Email: Yuanfu Liu (yfliu@bjtu.edu.cn)

    DOI:10.3788/CJL202047.0102008

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