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<p>This study systematically investigates the effects of WC content (5, 15, 25%) on the microstructure and properties of FeCrNi alloy laser claddings. FeCrNi/WC composite coatings were fabricated on low-alloy cast iron substrates via coaxial powder-feeding laser cladding technology. The influence of WC content on the phase composition, microstructure, mechanical properties, and corrosion resistance of the coatings was analyzed using XRD, SEM, microhardness testing, friction and wear testing, and electrochemical measurements. The results indicate that the addition of WC significantly refines the grains and promotes the formation of hard phases such as Fe<sub>2</sub>W and M<sub>7</sub>C<sub>3</sub>, synergistically enhancing the coating performance through grain refinement strengthening, dispersion strengthening, and solid solution strengthening. The 15% WC coating exhibited the highest average microhardness of 552.5&#xa0;HV<sub>0.2</sub>, the lowest wear rate of 2.42 × 10<sup>−4</sup> mm<sup>3</sup>/(N m) and the optimal corrosion resistance (corrosion current density of 5.375&#xa0;µA cm<sup>−2</sup>). Compared with the 5% WC coating, its wear rate and corrosion current density decreased by approximately 54.8 and 16.3%, respectively. The best wear resistance (average friction coefficient of 0.260, wear rate of 2.42 × 10<sup>−4</sup> mm<sup>3</sup>/(N m)); and the optimal corrosion resistance. Excessive WC (25%) leads to particle agglomeration and a decline in performance. This research provides a theoretical basis for optimizing the composition of FeCrNi-WC coatings on low-alloy cast iron surfaces under wear-corrosion coupling conditions.</p>

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Effect of WC Content on the Microstructure, Wear Resistance and Corrosion Resistance of Laser-Cladded FeCrNi Medium-Entropy Alloy Coatings

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Liyun Li,
  • Shubo Xu,
  • Xingcheng Xu,
  • Chen Xu,
  • Yuefei Pan,
  • Kuan Yu,
  • Hongliang Zhou

摘要

This study systematically investigates the effects of WC content (5, 15, 25%) on the microstructure and properties of FeCrNi alloy laser claddings. FeCrNi/WC composite coatings were fabricated on low-alloy cast iron substrates via coaxial powder-feeding laser cladding technology. The influence of WC content on the phase composition, microstructure, mechanical properties, and corrosion resistance of the coatings was analyzed using XRD, SEM, microhardness testing, friction and wear testing, and electrochemical measurements. The results indicate that the addition of WC significantly refines the grains and promotes the formation of hard phases such as Fe2W and M7C3, synergistically enhancing the coating performance through grain refinement strengthening, dispersion strengthening, and solid solution strengthening. The 15% WC coating exhibited the highest average microhardness of 552.5 HV0.2, the lowest wear rate of 2.42 × 10−4 mm3/(N m) and the optimal corrosion resistance (corrosion current density of 5.375 µA cm−2). Compared with the 5% WC coating, its wear rate and corrosion current density decreased by approximately 54.8 and 16.3%, respectively. The best wear resistance (average friction coefficient of 0.260, wear rate of 2.42 × 10−4 mm3/(N m)); and the optimal corrosion resistance. Excessive WC (25%) leads to particle agglomeration and a decline in performance. This research provides a theoretical basis for optimizing the composition of FeCrNi-WC coatings on low-alloy cast iron surfaces under wear-corrosion coupling conditions.