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<p>Excellent structural stability, cavitation, wear, and corrosion resistance are key factors that must be met during the service life of steam turbine blades. To improve the wear resistance of turbine blade material 17-4PH, a forced cooling device was designed, and high-speed laser cladding experiments of air cooling, 5&#xa0;°C forced water cooling, and liquid nitrogen cooling were carried out. The friction and wear tester and scanning electron microscope were used to test the friction coefficient of the coating and the substrate obtained under air cooling, forced water cooling at 5&#xa0;°C and liquid nitrogen cooling, respectively. The wear microstructure of the sample was observed, and the wear mechanism was explored. The results show that the friction coefficients of the coatings obtained by substrate, air cooling, 5&#xa0;°C water cooling, and liquid nitrogen cooling are 0.587, 0.504, 0.357, and 0.276, respectively. The wear performance of the coating is better than that of the substrate. The friction coefficient decreases with the decrease of the cooling temperature, and the scuffing resistance is gradually enhanced. From the degree of enhancement, the performance of the cladding layer obtained by forced cooling of liquid nitrogen is the most improved. The wear resistance is the best, which is related to the grain refinement caused by the presence of WC particles in the structure and the high content of hard carbides in the structure. </p>

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Influence of Different Cooling Modes on the Microstructure and Wear Resistance of Iron-Based Ceramic WC Composite Coatings by High-Speed Laser Cladding

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Y. H. Cui,
  • S. Z. Tang,
  • W. Chen,
  • S. R. Guo,
  • L. J. Yang,
  • B. Zheng,
  • Y. Y. Gao,
  • Y. Zhao

摘要

Excellent structural stability, cavitation, wear, and corrosion resistance are key factors that must be met during the service life of steam turbine blades. To improve the wear resistance of turbine blade material 17-4PH, a forced cooling device was designed, and high-speed laser cladding experiments of air cooling, 5 °C forced water cooling, and liquid nitrogen cooling were carried out. The friction and wear tester and scanning electron microscope were used to test the friction coefficient of the coating and the substrate obtained under air cooling, forced water cooling at 5 °C and liquid nitrogen cooling, respectively. The wear microstructure of the sample was observed, and the wear mechanism was explored. The results show that the friction coefficients of the coatings obtained by substrate, air cooling, 5 °C water cooling, and liquid nitrogen cooling are 0.587, 0.504, 0.357, and 0.276, respectively. The wear performance of the coating is better than that of the substrate. The friction coefficient decreases with the decrease of the cooling temperature, and the scuffing resistance is gradually enhanced. From the degree of enhancement, the performance of the cladding layer obtained by forced cooling of liquid nitrogen is the most improved. The wear resistance is the best, which is related to the grain refinement caused by the presence of WC particles in the structure and the high content of hard carbides in the structure.