Heat Treatment of Metals ›› 2024, Vol. 49 ›› Issue (2): 281-290.DOI: 10.13251/j.issn.0254-6051.2024.02.044

• SURFACE ENGINEERING • Previous Articles     Next Articles

Influence of carrier gas flow rate on microstructure and corrosion resistance of laser clad Ni-based coatings with Y2O3

Li Yunfeng1, Wang Jiasheng1, Shi Yan2,3, Jiang Guangjun1, Tang Shufeng1, He Xiaodong1   

  1. 1. College of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot Inner Mongolia 010051, China;
    2. School of Mechanical and Electric Engineering, Changchun University of Science and Technology, Changchun Jilin 130022, China;
    3. National Base of International Science and Technology Cooperation for Optics, Changchun Jilin 130022, China
  • Received:2023-09-03 Revised:2023-12-25 Online:2024-03-27 Published:2024-03-27

Abstract: A 5 kW CO2 laser was used for the preparation of pure Ni45 alloy coating and Ni45+0.4wt%Y2O3 coating on 42CrMoA steel substrate. Numerical simulation of the carrier gas flow rate was conducted using FLUENT software. The macroscopic morphologies and microstructure of the two coatings with different carrier gas flow rates were characterized using optical microscopy, scanning electron microscopy and XRD tester. The results show that as the carrier gas flow rate is increased from 500 L/h to 700 L/h, the powder deposition efficiency initially increases and then decreases. The solidification types of the two coatings consist of planar grains, cellular grains, columnar dendritic grains, and equiaxed grains, and with γ-Ni, M23C6, and Ni3B phases. The microstructure refinement is most prominent when using a carrier gas flow rate of 600 L/h. The corrosion resistance increases initially, then decreases with the increase of carrier gas flow rate, and the coating produced with 600 L/h carrier gas flow rate has the best corrosion resistance.

Key words: Ni-based laser clad coating, Y2O3, numerical simulation, microstructure, corrosion resistance

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