Abstract
Inconel 625, Ni-based superalloy has been increasingly used as coatings for protecting metallic surfaces against wear, high temperatures, and corrosive environments. In this paper, the investigation of depositing Inconel 625 of varying coating thicknesses (250, 300, 400, and 500 µm) using high-velocity oxy-fuel technique on 304 stainless steel substrate was conducted. The residual stresses of the as-sprayed coatings were investigated using neutron diffraction technique as it can provide high resolution, penetration depth, and its insensitivity to the surface condition. Friction coefficient and wear of the coating were also determined using a ball on disk tribometer sliding against E52100 steel balls. The effect of coating thickness and loading force on the tribological behavior of Inconel films were considered. Compressive residual stresses measured by neutron diffraction were observed for all coating thicknesses, particularly the 400 µm thick coating having the highest compressive stress of − 330 ± 40 MPa. The wear results suggested that the load and coating thickness has a significant influence on the wear rate and the wear mechanism on the surface, which were distinctly discussed.
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Acknowledgments
The author wishes to acknowledge the following: Botswana International University of Science & Technology (BIUST) for their technical and financial support; ANSTO for the beamtime awarded on the KOWARI Neutron scattering instrument under proposals ID 6768, and assistance provided by V. Luzin. Light sources for Africa, the Americans and Middle East Project (LAAMP) for making this project feasible through their financial support. The equipment supports from Thermal spray South Africa for the deposition of the coating are highly appreciated. High Accelerator Research Organization (KEK) for the beamtime awarded at BL-8B of PF under the approval of PAC No. 2017R-19, and assistance of Prof H. Sagayama.
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Residual Stresses Credit Line: This article is part of a special topical focus in the Journal of Thermal Spray Technology on Advanced Residual Stress Analysis in Thermal Spray and Cold Spray Processes. This issue was organized by Dr. Vladimir Luzin, Australian Centre for Neutron Scattering; Dr. Seiji Kuroda, National Institute of Materials Science; Dr. Shuo Yin, Trinity College Dublin; and Dr. Andrew Ang, Swinburne University of Technology.
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Oladijo, O.P., Luzin, V., Maledi, N.B. et al. Residual Stress and Wear Resistance of HVOF Inconel 625 Coating on SS304 Steel Substrate. J Therm Spray Tech 29, 1382–1395 (2020). https://doi.org/10.1007/s11666-020-01066-x
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DOI: https://doi.org/10.1007/s11666-020-01066-x