Microstructure and tribological performance of WC-Co cermet strengthened nickel alloy composite coatings manufactured by extreme high-speed laser cladding (EHLA)
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2025
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Bezerra, B.F.A.
Pinches, S.
King, H.J.
Chan, S.S.L.
Meghwal, A.
Kaur, S.
Hall, C.
Berndt, C.C.
Ang, A.S.M.
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Surface and Coatings Technology, 2025; 512(132390):1-16
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Composite coatings composed of blended nickel alloy (IN625) and WC-Co cermet were applied via the extreme high-speed laser cladding (EHLA) process to investigate its feasibility as a coating replacement for hard chrome plating. A range of laser powers was investigated. These cermet coatings were benchmarked against an IN625-only coating, in the analysis of their macrostructure, microstructure, phase composition, Vickers microhardness and sliding wear resistance by the pin-on-disc test. The EHLA process resulted in crack-free coatings, with a good metallurgical bonding to the substrate and homogenous distribution of cermet particles within the coatings. The microhardness of the EHLA composite coatings increased by 81–102 % as compared to the IN625 EHLA coating. The wear rates of the composite coatings were only 0.5–1.4 % that of the IN625 coating, and only 1–4 % that of hard chrome coating. A decrease in laser power demonstrated an increase in the carbide-occupied cross-sectional area from 11.2 % to 17.2 %, which corresponded to a 64 % enhancement in wear resistance. This study highlights the critical balance required between laser power, carbide area fraction and microstructural characteristics, on the performance of EHLA-deposited composite coatings.
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Copyright 2025 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)