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<p>Laser cladding provides the feasibility for fabricating various ceramic-reinforced metal–matrix composite coatings, in which the particle size and content of the reinforcing particles play a crucial role in the properties of the cladding. In this paper, to improve the hardness and wear resistance of Inconel 718 coatings, a series of composite coatings were prepared by laser cladding and the effects of WC-Co grain size and content on the macrostructure, microstructure, phase composition, and mechanical properties of Inconel 718 coatings were revealed in detail. The results showed that with the increase in WC-Co content, multiple carbides coexisted in the coating, the grain size became smaller, and the cracking susceptibility increased. The coatings containing 10-55&#xa0;μm WC-Co particles have higher grain refinement and higher hardness and better plasticity, but also higher coefficient of friction (COF) values. Based on the increased hardness, the coatings containing 40-120&#xa0;μm WC-Co particles showed better wear resistance, with a 70.3% reduction in wear volume compared to pure Inconel 718 with 30% WC-Co content. The wear mechanism of each coating was dominated by abrasive wear.</p>

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Microstructure and Wear Performance of Inconel 718 Composite Coatings Reinforced with Multi-size and Content WC-Co Fabricated by Laser Cladding

  • 期刊论文

  • 发表日期：

    2025年1月10日

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  • Lu Xu,
  • Lida Zhu,
  • Miao Yu,
  • Jinsheng Ning,
  • Zhichao Yang,
  • Zongze Jiang,
  • Peihua Xu,
  • Shaoqing Qin,
  • Chenglong Zhai

摘要

Laser cladding provides the feasibility for fabricating various ceramic-reinforced metal–matrix composite coatings, in which the particle size and content of the reinforcing particles play a crucial role in the properties of the cladding. In this paper, to improve the hardness and wear resistance of Inconel 718 coatings, a series of composite coatings were prepared by laser cladding and the effects of WC-Co grain size and content on the macrostructure, microstructure, phase composition, and mechanical properties of Inconel 718 coatings were revealed in detail. The results showed that with the increase in WC-Co content, multiple carbides coexisted in the coating, the grain size became smaller, and the cracking susceptibility increased. The coatings containing 10-55 μm WC-Co particles have higher grain refinement and higher hardness and better plasticity, but also higher coefficient of friction (COF) values. Based on the increased hardness, the coatings containing 40-120 μm WC-Co particles showed better wear resistance, with a 70.3% reduction in wear volume compared to pure Inconel 718 with 30% WC-Co content. The wear mechanism of each coating was dominated by abrasive wear.