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<p>This study fabricated a CoCrFeNiTi high-entropy alloy (HEA) coating on 45# steel substrates using high-speed laser cladding (HLC) technology. A comprehensive investigation was conducted to characterize the coating’s microstructure, phase composition, elemental distribution, microhardness, wear resistance, and corrosion behavior. Compared with conventional laser cladding (CLC), HLC achieved an 80% reduction in heat input and elevated cooling rates to the 10<sup>3</sup>&#xa0;K/s magnitude through a powder pre-melting mechanism. These thermal dynamics promoted significant grain refinement (average size: 3.6&#xa0;μm) and effective suppression of elemental segregation. Microstructural analysis revealed that the HLC coating exhibited a refined multiphase architecture with submicron-scale features, accompanied by an 18% increase in low-angle grain boundaries and a 74% reduction in interfacial transition zone width. Mechanical and electrochemical evaluations demonstrated superior performance metrics: The HLC coating attained a microhardness of 850 HV (11.8% enhancement over CLC), exhibited a reduced friction coefficient of 0.68 (45.2% lower wear volume), and displayed a self-corrosion current density of 2.18 × 10<sup>-5</sup> A/cm<sup>2</sup> (78.8% reduction compared to CLC). These findings substantiate that HLC technology provides a promising pathway for enhancing the tribological and anti-corrosion performance of HEA coatings in industrial applications.</p>

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Microstructure-Engineered CoCrFeNiTi HEA Coatings via HLC: Synergistic Enhancement of Wear and Corrosion Resistance

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • Juncheng Wang,
  • Weiwei Zhou,
  • Shouqi Zhao,
  • Jia Fu,
  • Shichen Xiao

摘要

This study fabricated a CoCrFeNiTi high-entropy alloy (HEA) coating on 45# steel substrates using high-speed laser cladding (HLC) technology. A comprehensive investigation was conducted to characterize the coating’s microstructure, phase composition, elemental distribution, microhardness, wear resistance, and corrosion behavior. Compared with conventional laser cladding (CLC), HLC achieved an 80% reduction in heat input and elevated cooling rates to the 103 K/s magnitude through a powder pre-melting mechanism. These thermal dynamics promoted significant grain refinement (average size: 3.6 μm) and effective suppression of elemental segregation. Microstructural analysis revealed that the HLC coating exhibited a refined multiphase architecture with submicron-scale features, accompanied by an 18% increase in low-angle grain boundaries and a 74% reduction in interfacial transition zone width. Mechanical and electrochemical evaluations demonstrated superior performance metrics: The HLC coating attained a microhardness of 850 HV (11.8% enhancement over CLC), exhibited a reduced friction coefficient of 0.68 (45.2% lower wear volume), and displayed a self-corrosion current density of 2.18 × 10-5 A/cm2 (78.8% reduction compared to CLC). These findings substantiate that HLC technology provides a promising pathway for enhancing the tribological and anti-corrosion performance of HEA coatings in industrial applications.