Evolution of Microstructure and Mechanical Properties of NiCoCrAlY Coatings After High-Current Pulsed Electron Beam Irradiation

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  • Tian Miao
    School of Materials Science and Engineering, North University of China
  • Li Yuxin
    School of Materials Science and Engineering, North University of China
  • Chen Bowen
    School of Materials Science and Engineering, North University of China
  • Wei Shouzhen
    School of Materials Science and Engineering, North University of China
  • Wang Jianhong
    School of Materials Science and Engineering, North University of China
  • Cai Jie
    School of Mechanical Engineering, Jiangsu University
  • Peng Lv
    School of Materials Science and Engineering, Jiangsu University
  • Duan Ruibin
    School of Mechanical Engineering, North University of China

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Abstract

<p>In this paper, the NiCoCrAlY coating prepared by laser cladding was modified by a high-current pulsed electron beam technique. Scanning electron microscopy and X-ray diffraction analysis were used to characterize the microstructure and composition of the coatings before and after irradiation, and then the changes in mechanical properties were revealed by comparing the hardness and friction properties of the two coatings. The results showed that the pulsed irradiation purified the coating surface, formed an evaporative recondensation layer and a plastic deformation layer, and produced a dense remelting layer with a thickness of 3–4 µm. The remelted layer led to an increase in the hardness of the irradiated coating and a decrease in the friction coefficient and wear. The pulsed irradiation effectively improved the mechanical properties of the coatings.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 64 (5), 1043-1051, 2023-05-01

    The Japan Institute of Metals and Materials

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