Residual Stress and Wear Resistance of HVOF Inconel 625 Coating on SS304 Steel Substrate
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Residual Stress and Wear Resistance of HVOF Inconel 625 Coating on SS304 Steel Substrate O. P. Oladijo1,2 • V. Luzin3,4 • N. B. Maledi5 • K. Setswalo1 • T. P. Ntsoane6 • H. Abe7,8
Submitted: 15 November 2019 / in revised form: 10 June 2020 ASM International 2020
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 lm) 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 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. & O. P. Oladijo [email protected] 1
Department of Chemical Materials and Metallurgical Engineering, Botswana International University of Science and Technology, Palapye, Botswana
2
Department of Mechanical Engineering, University of Johannesburg, Johannesburg, South Africa
3
Australian Nuclear Science and Technology Organization, Lucas Heights, NSW 2234, Australia
4
School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia
coating thicknesses, particularly the 400 lm 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. Keywords HVOF inconel 625 neutron diffraction residual stresses wear x-ray diffraction
Introduction Residual stresses, fatigue, and corrosion are some of the prominent challenges faced by aerospace, aeronautical, marine, petrochemical, and chemical industries (Ref 1-3). Adhering to these challenges, nickel-based alloys such as Inconel 625 and Inconel 718 have been adopted to impart a combination of good properties such as tensile strength, weldability, yield strength, toughness, oxidation resistance, excellent fatigue strength and high strength at elevated temperatures (Ref 1, 4). Inconel 625 acts as high 5
School of Chemical and Metallurgical Engi
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