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<p>This study investigates the synergistic influence of hybrid TiB<sub>2</sub> + B<sub>4</sub>C reinforcement and laser remelting on the mechanical and erosion performance of HVOF-sprayed WC-10Co-4Cr coatings on SS304 steel. The hybrid addition enhanced hardness from 1120 ± 38 HV to 1245 ± 31 HV, while remelting further increased it to 1365 ± 27 HV because of microstructural refinement and porosity reduction (from 1.51% to 0.86%). Slurry and cavitation erosion tests revealed a huge reduction in material loss compared to uncoated steel, attributed to inter-splat fusion and uniform reinforcement distribution. SEM analysis confirmed a transition from brittle fracture and particle pull-out to ductile abrasion-dominated mechanisms. The combined compositional and laser-processing approach demonstrates a viable pathway to engineer dense, erosion-resistant coatings for hydro-turbine and slurry handling applications.</p>

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Synergistic Enhancement of Mechanical and Erosion Performance in HVOF-Sprayed WC-10Co-4Cr Coatings via TiB2-B4C Hybrid Reinforcement and Laser Remelting

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Jasdeep Singh,
  • Vikrant Singh,
  • Anuj Bansal,
  • Anil Kumar Singla,
  • Jonny Singla,
  • Jagtar Singh

摘要

This study investigates the synergistic influence of hybrid TiB2 + B4C reinforcement and laser remelting on the mechanical and erosion performance of HVOF-sprayed WC-10Co-4Cr coatings on SS304 steel. The hybrid addition enhanced hardness from 1120 ± 38 HV to 1245 ± 31 HV, while remelting further increased it to 1365 ± 27 HV because of microstructural refinement and porosity reduction (from 1.51% to 0.86%). Slurry and cavitation erosion tests revealed a huge reduction in material loss compared to uncoated steel, attributed to inter-splat fusion and uniform reinforcement distribution. SEM analysis confirmed a transition from brittle fracture and particle pull-out to ductile abrasion-dominated mechanisms. The combined compositional and laser-processing approach demonstrates a viable pathway to engineer dense, erosion-resistant coatings for hydro-turbine and slurry handling applications.