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Preparation of Laser Cladding Coating Undercooling Cu-based Alloy and Co on Non-equilibrium Solidification Structure

  • Metallic Materials
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Abstract

The effect of the gradient content of Co element on the solidification process of Cu-based alloy under deep under cooling conditions was explored. The non-equilibrium solidification structure of the under cooled alloy samples were analyzed. It is found that the rapidly solidified alloy has undergone twice grain refinement during the undercooling process. Characterization and significance of the maximum undercooling refinement structure of Cu60Ni35Co5 at T=253 K were analyzed. High-density defects were observed, such as dislocations, stacking faults networks, and twinning structures. The standard FCC diffraction pattern represents that it is still a single-phase structure. Based on the metallographic diagram, EBSD and TEM data analysis, it is illustrated that the occurrence of grain refinement under high undercooling is due to stress induced recrystallization. In addition, the laser cladding technology is used to coat Co-based alloy (Stellite12) coating on 304 stainless steel substrate; the microstructure of the coating cross-section was analyzed. It was found that the microstructure of the cross-section is presented as columnar crystals, planar crystals, and disordered growth direction, so that the coating has better hardness and wear resistance. By electrochemical corrosion of the substrate and coating, it can be seen that the Co and Cr elements present in the coating are more likely to form a dense passivation film, which improved the corrosion resistance of the coating.

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Authors and Affiliations

  1. Department of Outpatient, Xinzhou People’s Hospital, Xinzhou, 034099, China

    Xuming Tian  (田徐铭)

  2. School of Mechanical Engineering, North University of China, Taiyuan, 030051, China

    Shichao Cao, Kai Hou & Hongfu Wang

  3. Department of Neurosurgery, Xinzhou People’s Hospital, Xinzhou, 034099, China

    Xiaopeng Hou

  4. Department of Orthopedics, Xinzhou People’s Hospital, Xinzhou, 034099, China

    Yu Zhang  (张煜)

Authors
  1. Xuming Tian  (田徐铭)
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  2. Shichao Cao
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  3. Kai Hou
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  4. Xiaopeng Hou
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  5. Hongfu Wang
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  6. Yu Zhang  (张煜)
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Corresponding author

Correspondence to Yu Zhang  (张煜).

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All authors declare that there are no competing interests.

Additional information

Funded by the Basic Research Projects in Shanxi Province (No.202103021224183)

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Tian, X., Cao, S., Hou, K. et al. Preparation of Laser Cladding Coating Undercooling Cu-based Alloy and Co on Non-equilibrium Solidification Structure. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 39, 463–472 (2024). https://doi.org/10.1007/s11595-024-2902-x

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  • DOI: https://doi.org/10.1007/s11595-024-2902-x

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