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<p>To improve the service life of AISI 1045 steel under harsh conditions, CoCrNiW0.6-<i>x</i>NbC composite coatings with varying NbC mass fractions were fabricated on AISI 1045 steel substrates using laser cladding. The effect of NbC on the macroscopic morphology, microstructure, and overall coating properties was systematically investigated. Results indicate that the addition of NbC promotes metallurgical bonding between the coating and the substrate. Fine NbC particles dispersed along grain boundaries significantly improve both mechanical properties and corrosion resistance. The microhardness of the coatings increases with higher NbC content, reaching a maximum average value of 469.15 HV<sub>0.5</sub>, which is 29.08% higher than that of the NbC-free coating. As the NbC proportion rises, the average friction coefficient and wear depth of the coatings decrease by 13.58% and 20.56%, respectively. Corrosion resistance initially decreases and then improves with NbC addition. The coating with 12wt% NbC demonstrates the best corrosion performance, exhibiting the highest self-corrosion potential ( – 0.434&#xa0;V), the lowest self-corrosion current density (7.168 × 10<sup>–8</sup> A/cm<sup>2</sup>), and the most compact passivation film. This work offers a new strategy for improving the wear and corrosion resistance of component surfaces via laser cladding.</p>

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Microstructure, properties, and strengthening mechanism of laser cladding CoCrNiW0.6 medium-entropy alloy reinforced with NbC particles

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Xuanze Yang,
  • Meiyan Feng,
  • Guofu Lian,
  • Zhigang Zeng,
  • Changrong Chen

摘要

To improve the service life of AISI 1045 steel under harsh conditions, CoCrNiW0.6-xNbC composite coatings with varying NbC mass fractions were fabricated on AISI 1045 steel substrates using laser cladding. The effect of NbC on the macroscopic morphology, microstructure, and overall coating properties was systematically investigated. Results indicate that the addition of NbC promotes metallurgical bonding between the coating and the substrate. Fine NbC particles dispersed along grain boundaries significantly improve both mechanical properties and corrosion resistance. The microhardness of the coatings increases with higher NbC content, reaching a maximum average value of 469.15 HV0.5, which is 29.08% higher than that of the NbC-free coating. As the NbC proportion rises, the average friction coefficient and wear depth of the coatings decrease by 13.58% and 20.56%, respectively. Corrosion resistance initially decreases and then improves with NbC addition. The coating with 12wt% NbC demonstrates the best corrosion performance, exhibiting the highest self-corrosion potential ( – 0.434 V), the lowest self-corrosion current density (7.168 × 10–8 A/cm2), and the most compact passivation film. This work offers a new strategy for improving the wear and corrosion resistance of component surfaces via laser cladding.