Abstract
In this study, simulation and experimental methods were used to investigate the influence of cold spray conditions on AISI 316L stainless steel coatings. The effect of both helium and nitrogen gases used was investigated. The temperature, particle sizes of spraying powder, and distance from the nozzle throat to the impinging point were estimated by using the Kinetics Spray Solutions GmbH software. The 316L stainless steel (SS) coatings were examined by X-ray diffraction, Scanning Electron Microscopy and Energy Dispersive X-Ray Microanalysis. The tribological behavior was evaluated under different loads (2 N and 5 N) in dry conditions. It was found that the nitrogen and helium propellant gas with high speed and fine particles led to produce good coatings with dense microstructures. From the nanoindentation experiments, the Young's modulus and hardness of the SS 316L samples were enhanced of about 8% with helium due to the high particle velocity. It was shown that the wear resistance of SS 316L produced with helium was higher than that of the standard SS 316L coatings. The coatings produced with helium revealed lower friction coefficient (0.65) and wear rate (6.9 × 10–4 mm3/Nm) under 2 N applied load than that obtained nitrogen. It was also found that the SS 316L cold sprayed by helium with dense structure presents high hardness and good tribological performance that can be suggested for several applications.Graphical
Highlights
In the conventional thermal spraying processes such as plasma spray, high-velocity oxyfuel HVOF, they require the melting or partial melting of feedstock material, quenching the molten droplets to produce coating, splat by splat into a lamellar structure
It is known that the sprayed particles in Cold spray (CS) have to be accelerated to a sufficiently high velocity in order to be deposited on the substrate successfully
Cold-sprayed 316L austenitic stainless steel coatings were deposited by CS process under He and N2 gases on aluminum substrate
Summary
In the conventional thermal spraying processes such as plasma spray, high-velocity oxyfuel HVOF, they require the melting or partial melting of feedstock material, quenching the molten droplets to produce coating, splat by splat into a lamellar structure. Cold spray (CS) is a great development for the deposition of metal coatings that presents a novel and emerging future approach consecutive to the thermal spray techniques, by using a carrier gas jet to accelerate solid particles for impacting substrates and forming the suitable coating [3] This leads to avoid or minimize many deleterious shortcomings of traditional thermal spray methods such as high-temperature oxidation, evaporation, melting, crystallization, and keeping the particles in their unmodified solid-state, and solid-state coating is obtained through feedstock [1,2,3,4]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
