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<p>The laser remelting (LR) technique was employed to enhance the wear resistance of in-situ fabricated Fe-based Co-Cr-Ni coatings on U71Mn steel. The study systematically investigated the effects of the LR process on the phase composition, microstructure, microhardness, surface roughness, and wear resistance of the cladding coatings. The results revealed that the Fe-based Co-Cr-Ni coatings were free from defects such as cracks or porosity. A uniform and refined columnar dendritic microstructure was observed at the top layer of the coatings. The microhardness of the coatings (630HV) was significantly higher than that of the U71Mn steel substrate (280HV). LR reduced surface roughness by up to 50% and improved wear resistance, with the wear volume rate decreasing by 70% after two LR passes.</p>

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Microstructure and Wear Behavior of Fe-based Co-Cr-Ni Coatings In-Situ Fabricated on U71Mn Steel by Laser Cladding with Post-laser Remelting

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Zhenyu Wang,
  • Hongnan Chen,
  • Songnan Zhao,
  • Yuling Yang,
  • Ying Lu,
  • Hongchao Qiao,
  • Jinyi Ren,
  • Zengguang Zhang

摘要

The laser remelting (LR) technique was employed to enhance the wear resistance of in-situ fabricated Fe-based Co-Cr-Ni coatings on U71Mn steel. The study systematically investigated the effects of the LR process on the phase composition, microstructure, microhardness, surface roughness, and wear resistance of the cladding coatings. The results revealed that the Fe-based Co-Cr-Ni coatings were free from defects such as cracks or porosity. A uniform and refined columnar dendritic microstructure was observed at the top layer of the coatings. The microhardness of the coatings (630HV) was significantly higher than that of the U71Mn steel substrate (280HV). LR reduced surface roughness by up to 50% and improved wear resistance, with the wear volume rate decreasing by 70% after two LR passes.