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Hybrid Co-Cr/W-WC and Ni-W-Cr-B/W-WC coating systems

Luc Vernhes, Marwan Azzi, Étienne Bousser, Jolanta-Ewa Sapieha, Thomas Schmitt and J. M. Lamarre

Article (2016)

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The aim of this study was to investigate the effects of subsurface materials on the performance of a wear-resistant thin film. The mechanical, tribological, and corrosion properties were assessed for two hybrid coating systems: (1) W-WC thin film and a laser cladded Co-Cr interlayer applied to a 316 stainless steel substrate and (2) the same W-WC thin film and a spray-and-fused Ni-W-Cr-B interlayer applied to an Inconel® 718 substrate. They were then compared to the same systems without an interlayer. The microstructures were analyzed by XRD, EDS, and SEM. The hardness and surface load-carrying capacity of the coating systems were determined by micro- and macrohardness testing. Rockwell indentation was used to assess coating adhesion (CEN/TS 1071-8). Tribological properties were assessed with a reciprocating tribometer, and corrosion resistance was determined by potentiodynamic polarization and electrochemical impedance spectroscopy. The originality of this work lies in the finding that, except for the Inconel 718/Ni-W-Cr-B/W-WC system, the wear rate decreases with decreasing hardness of the subsurface materials carrying the thin film due to the decreasing contact pressure for a given load. Another novel finding is the stress-induced phase transformation of the Co-Cr interlayer, which occurs beneath the thin film under high load.

Uncontrolled Keywords

corrosion resistance; hybrid coating systems; load-carrying capacity; tribomechanical properties; superalloy hardfacing; thin film interlayer

Department: Department of Engineering Physics
Research Center: Other
PolyPublie URL: https://publications.polymtl.ca/35600/
Journal Title: Journal of Thermal Spray Technology (vol. 25, no. 1-2)
Publisher: Springer
DOI: 10.1007/s11666-015-0357-5
Official URL: https://doi.org/10.1007/s11666-015-0357-5
Date Deposited: 18 Apr 2023 15:07
Last Modified: 03 Oct 2023 15:59
Cite in APA 7: Vernhes, L., Azzi, M., Bousser, É., Sapieha, J.-E., Schmitt, T., & Lamarre, J. M. (2016). Hybrid Co-Cr/W-WC and Ni-W-Cr-B/W-WC coating systems. Journal of Thermal Spray Technology, 25(1-2), 346-356. https://doi.org/10.1007/s11666-015-0357-5



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