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<p>CoCrCu<sub>0.1</sub>FeMoNi high-entropy alloy was laser-cladded onto H13 steel to improve the surface properties. As the laser power increased from 1400W to 2000W, the average Fe contents of the coatings increase from 19.98 at.% to 33.81 at.% due to the increasing dilution rate, and typical microstructures of the coatings evolved from a predominantly eutectic structure to an equiaxed structure. The coatings exhibit a mixture of FCC, σ, and μ phases, and the volume fraction of FCC phase increased with the increasing laser power. Additionally, the solidification behavior of the coatings was thoroughly investigated. The substrate was significantly strengthened by the high-entropy alloy coatings. Compared to H13 steel, the coatings demonstrated superior performance in forming a passivation film and resisting pit corrosion in 3.5% NaCl solution. Notably, the coating fabricated at 2000W with a scanning speed of 2&#xa0;mm/s exhibited corrosion resistance that surpassed that 304 stainless steel.</p>

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Laser Cladding CoCrCu0.1FeMoNi High-Entropy Coatings: Microstructure Evolution and Corrosion Resistance

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • Ning Liu,
  • Haoyu Zhang,
  • Xin Zhang,
  • Zheng Chen

摘要

CoCrCu0.1FeMoNi high-entropy alloy was laser-cladded onto H13 steel to improve the surface properties. As the laser power increased from 1400W to 2000W, the average Fe contents of the coatings increase from 19.98 at.% to 33.81 at.% due to the increasing dilution rate, and typical microstructures of the coatings evolved from a predominantly eutectic structure to an equiaxed structure. The coatings exhibit a mixture of FCC, σ, and μ phases, and the volume fraction of FCC phase increased with the increasing laser power. Additionally, the solidification behavior of the coatings was thoroughly investigated. The substrate was significantly strengthened by the high-entropy alloy coatings. Compared to H13 steel, the coatings demonstrated superior performance in forming a passivation film and resisting pit corrosion in 3.5% NaCl solution. Notably, the coating fabricated at 2000W with a scanning speed of 2 mm/s exhibited corrosion resistance that surpassed that 304 stainless steel.