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<p>The enhancement of surface durability in steels such as CA6NM is of significant importance for extending component life in demanding applications. In this study, CA6NM steel substrates were coated with detonation gun (D-gun) sprayed Al₂O₃–13(TiO₂) and Cr₃C₂–25(NiCr) coatings, and their scratch resistance was systematically investigated. The coatings were deposited under controlled conditions to achieve dense microstructures with minimal porosity. Scratch tests were performed to evaluate the critical loads corresponding to coating failure modes, including cracking, spallation, and delamination. Scratch visibility was evaluated by measuring the scratch width through scanning electron microscopy (SEM) and determining the penetration depth using a machine vision–based system. The results demonstrated that Al₂O₃–13(TiO₂) coating offered superior hardness and lower coefficient of friction (CoF) and resistance to plastic deformation whereas Cr₃C₂–25(NiCr) coating exhibited better adhesion and toughness, thereby delaying catastrophic failure.</p>

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Scratch Testing Performance of Thermally Sprayed Al2O3−13TiO2 and Cr3C2−25NiCr Coated CA6NM Steel

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Sanjeev Kumar,
  • Sanjeev Bhandari,
  • Manpreet Kaur

摘要

The enhancement of surface durability in steels such as CA6NM is of significant importance for extending component life in demanding applications. In this study, CA6NM steel substrates were coated with detonation gun (D-gun) sprayed Al₂O₃–13(TiO₂) and Cr₃C₂–25(NiCr) coatings, and their scratch resistance was systematically investigated. The coatings were deposited under controlled conditions to achieve dense microstructures with minimal porosity. Scratch tests were performed to evaluate the critical loads corresponding to coating failure modes, including cracking, spallation, and delamination. Scratch visibility was evaluated by measuring the scratch width through scanning electron microscopy (SEM) and determining the penetration depth using a machine vision–based system. The results demonstrated that Al₂O₃–13(TiO₂) coating offered superior hardness and lower coefficient of friction (CoF) and resistance to plastic deformation whereas Cr₃C₂–25(NiCr) coating exhibited better adhesion and toughness, thereby delaying catastrophic failure.