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<p>As the core power device in modern industry, the cylinder sleeve—a key engine component—endures high temperatures, high pressures, and wear. Applying high-performance coatings via laser cladding with optimized parameters effectively improves wear and corrosion resistance. The results indicate that the NiCr coating produced at 1400 W laser power exhibits the highest quality, with a porosity of 0.36%, and primarily consists of γ-(Ni, Cr), γ-(Ni, Fe), and Ni<sub>2.9</sub>Cr<sub>0.7</sub>Fe<sub>0.36</sub> phases. As the laser power increased from 1200 W to 2000 W, the wear scar depth of the coating gradually decreased from 28.4&#xa0;μm to 27.2&#xa0;μm, and then increased to 33.5&#xa0;μm. The NiCr coating exhibited an initial decrease followed by an increase in both friction coefficient and wear rate, reaching their lowest values at 1400 W. At this power, the coating exhibits a minimum wear rate of 1.47 × 10<sup>-5</sup> mm<sup>3</sup>/(N·m), with abrasive wear and adhesive wear being the predominant mechanisms. The 1400 W NiCr coating exhibited the fewest fatigue cracks and adhesive wear marks, with its uniform grain distribution effectively reducing plastic deformation during friction and improving tribological performance.</p>

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Effect of Laser Power on Microstructure and Tribological Properties of Laser-Melted NiCr Coatings

  • 期刊论文

  • 发表日期：

    2025年8月5日

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  • Han Gao,
  • Zicong Zhang,
  • Jinyong Xu,
  • Petr Rusinov,
  • Sergi Dosta,
  • Chao Zhang

摘要

As the core power device in modern industry, the cylinder sleeve—a key engine component—endures high temperatures, high pressures, and wear. Applying high-performance coatings via laser cladding with optimized parameters effectively improves wear and corrosion resistance. The results indicate that the NiCr coating produced at 1400 W laser power exhibits the highest quality, with a porosity of 0.36%, and primarily consists of γ-(Ni, Cr), γ-(Ni, Fe), and Ni2.9Cr0.7Fe0.36 phases. As the laser power increased from 1200 W to 2000 W, the wear scar depth of the coating gradually decreased from 28.4 μm to 27.2 μm, and then increased to 33.5 μm. The NiCr coating exhibited an initial decrease followed by an increase in both friction coefficient and wear rate, reaching their lowest values at 1400 W. At this power, the coating exhibits a minimum wear rate of 1.47 × 10-5 mm3/(N·m), with abrasive wear and adhesive wear being the predominant mechanisms. The 1400 W NiCr coating exhibited the fewest fatigue cracks and adhesive wear marks, with its uniform grain distribution effectively reducing plastic deformation during friction and improving tribological performance.