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Influence of Plasma Transferred Arc Remelting on Microstructure and Properties of PTAW-Deposited Ni-Based Overlay Coating

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Abstract

Although overlay coatings deposited via plasma transferred arc welding (PTAW) can effectively prolong the service life and improve the performance of components, cracks and pores tend to occur in the high-hardness and wear-resistant coating during the deposition process. Further treatment is thus necessary to improve the coating quality. Herein, PTAW-deposited Ni-based overlay coating was remelted using plasma transferred arc (PTA) under different remelting currents (RCs). The microstructure and phase composition of the coatings were investigated via metallographic microscopy and x-ray diffraction. The hardness, surface quality, and wear resistance of the coatings were also tested. The results show that PTA remelting could effectively eliminate the defects and improve the coating properties when the RC was controlled within a given interval (100-120 A). The type and content of the hard phase in the remelted coating were increased to enhance the microhardness and wear resistance. However, remelting with excessive currents resulted in the agglomeration and growth of the hard phases, which negatively affected the coating hardness and wear resistance. The proper use of PTA remelting technology to treat PTAW-deposited overlay coating is an effective approach for eliminating the coating defects and enhancing the coating properties.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Grant Nos 51675155 and 51722502) and the Fundamental Research Funds for the Central Universities (PA2019GDQT0024). The authors express their gratitude to Dr. Wei Sun (Institute of Tribology, Hefei University of Technology) and Professor Xiangyang Tong (Wuhan Research Institute of Material Protection) for the useful comments and discussions.

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  1. School of Mechanical Engineering, Hefei University of Technology, Hefei, People’s Republic of China

    Hongmeng Xu, Haihong Huang & Zhifeng Liu

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  1. Hongmeng Xu
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Correspondence to Haihong Huang.

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This article is an invited paper selected from presentations at the 10th Asian Thermal Spray Conference (ATSC 2020) and has been expanded from the original presentation. ATSC 2020 was held in Ningbo, China, from November 1-3, 2020, and was organized by the Asian Thermal Spray Society with Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences as the Host Organizer.

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Xu, H., Huang, H. & Liu, Z. Influence of Plasma Transferred Arc Remelting on Microstructure and Properties of PTAW-Deposited Ni-Based Overlay Coating. J Therm Spray Tech 30, 946–958 (2021). https://doi.org/10.1007/s11666-021-01183-1

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  • DOI: https://doi.org/10.1007/s11666-021-01183-1

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