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Research Article

Superior corrosion resistance dependent laser energy density in (CoCrFeNi)95Nb5 high entropy alloy coating fabricated by laser cladding

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  • Received: 12 October 2020Revised: 27 November 2020Accepted: 8 December 2020Available online: 12 December 2020
  • The (CoCrFeNi)95Nb5 high entropy alloy (HEA) coatings were successfully fabricated on the substrate of Q235 steel by laser cladding technology. These (CoCrFeNi)95Nb5 HEA coatings possess excellent properties, especially its corrosion resistance is obviously better than that of some typical bulk HEA and common engineering alloys. In order to obtain appropriate laser cladding preparation process parameters, the effects of laser energy density on the microstructure, microhardness and corrosion resistance of (CoCrFeNi)95Nb5 HEA coating were emphatically studied. As the laser energy density increases, the precipitation of Laves phase in (CoCrFeNi)95Nb5 HEA coating gradually decreases, and the diffusion of Fe element in the substrate intensifies, which affects the integrity of the (CoCrFeNi)95Nb5 HEA, resulting in the microhardness of (CoCrFeNi)95Nb5 HEA coatings decreasing. Moreover, the relative content of Cr2O3, Cr(OH)3, and Nb2O5 in the surface passive film of the coating decreases with the increasing of energy density, making the corrosion resistance decrease. This study demonstrates the controllability of high-performance HEA coating with laser cladding technology, which has certain guiding significance for laser cladding preparation of other CoCrFeNi-system HEA coatings.
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Superior corrosion resistance dependent laser energy density in (CoCrFeNi)95Nb5 high entropy alloy coating fabricated by laser cladding

  • Corresponding authors:

    Wu Qi    E-mail: miracle_iu@163.com

    Xiao Yang    E-mail: yangxiao@mail.ipc.ac.cn

  • 1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 2. Key Laboratory of Fluid Interaction with Material, Ministry of Education, 100083, China
  • 3. R&D management department, China nuclear power technology research institute Co., Ltd., Shenzhen 518031, China
  • 4. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • 5. Unit 92228, People's Liberation Army, Beijing 100072, China

Abstract: The (CoCrFeNi)95Nb5 high entropy alloy (HEA) coatings were successfully fabricated on the substrate of Q235 steel by laser cladding technology. These (CoCrFeNi)95Nb5 HEA coatings possess excellent properties, especially its corrosion resistance is obviously better than that of some typical bulk HEA and common engineering alloys. In order to obtain appropriate laser cladding preparation process parameters, the effects of laser energy density on the microstructure, microhardness and corrosion resistance of (CoCrFeNi)95Nb5 HEA coating were emphatically studied. As the laser energy density increases, the precipitation of Laves phase in (CoCrFeNi)95Nb5 HEA coating gradually decreases, and the diffusion of Fe element in the substrate intensifies, which affects the integrity of the (CoCrFeNi)95Nb5 HEA, resulting in the microhardness of (CoCrFeNi)95Nb5 HEA coatings decreasing. Moreover, the relative content of Cr2O3, Cr(OH)3, and Nb2O5 in the surface passive film of the coating decreases with the increasing of energy density, making the corrosion resistance decrease. This study demonstrates the controllability of high-performance HEA coating with laser cladding technology, which has certain guiding significance for laser cladding preparation of other CoCrFeNi-system HEA coatings.

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