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<p>NiCr20-5WC-5Fe coatings were fabricated on 45 steel using laser cladding (LC), and the microstructure, surface topographies and microhardness of obtained coatings were systematically investigated. The effects of laser energy density (LED) on the wear and electrochemical corrosion properties were comparatively analyzed, and the wear and corrosion mechanisms were also discussed in detail. The results indicate that the grains of NiCr20-5WC-5Fe coating fabricated at the LED of 45&#xa0;J&#xa0;mm<sup>–2</sup> exhibit the refined grains among the three kinds of LEDs, which improve its surface smoothness. Furthermore, the coating with the highest hardness of 383 HV<sub>0.5</sub> possesses the superior wear resistance, and the wear mechanism is combined of adhesive delamination and abrasive wear. The corrosion resistance of NiCr20-5WC-5Fe coating fabricated at the LED of 45&#xa0;J&#xa0;mm<sup>–2</sup> is also improved by the Cr<sub>2</sub>O<sub>3</sub> passive film, showing that the LED leads to the Fe enrichment, which deteriorates the anti-corrosion performance of coating. The findings reveal that the appropriate LED plays a key role in improving the hardness of NiCr-based coatings, enhancing their wear resistance and corrosion resistance.</p>

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Laser Energy Density Tailored Microstructure, Wear, and Electrochemical Properties of NiCr20-5WC-5Fe Coating

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Zhu Jian,
  • Cao Furong,
  • Kong Dejun

摘要

NiCr20-5WC-5Fe coatings were fabricated on 45 steel using laser cladding (LC), and the microstructure, surface topographies and microhardness of obtained coatings were systematically investigated. The effects of laser energy density (LED) on the wear and electrochemical corrosion properties were comparatively analyzed, and the wear and corrosion mechanisms were also discussed in detail. The results indicate that the grains of NiCr20-5WC-5Fe coating fabricated at the LED of 45 J mm–2 exhibit the refined grains among the three kinds of LEDs, which improve its surface smoothness. Furthermore, the coating with the highest hardness of 383 HV0.5 possesses the superior wear resistance, and the wear mechanism is combined of adhesive delamination and abrasive wear. The corrosion resistance of NiCr20-5WC-5Fe coating fabricated at the LED of 45 J mm–2 is also improved by the Cr2O3 passive film, showing that the LED leads to the Fe enrichment, which deteriorates the anti-corrosion performance of coating. The findings reveal that the appropriate LED plays a key role in improving the hardness of NiCr-based coatings, enhancing their wear resistance and corrosion resistance.