| Résumé | Cold spray processing of stainless steel coatings, which represent a cost-effective method for wear and corrosion resistance, has been demonstrated as technically feasible. However, these coatings have a very low tensile strength in the as-sprayed condition, and also may display a marginally higher wear rate. In this study, the cold spray of 316L stainless steel coatings was investigated to characterize the effect of powder size distribution and post-spray heat treatment on strength and wear properties. Coatings on aluminum and steel alloy substrates were produced with a feedstock powder that was obtained in three particle size distributions. The deposition process for all coatings employed nitrogen as the propellant gas and a constant set of spray conditions. A set of screening heat treatments using coupons from coatings produced with one powder size distribution was employed to obtain optimized annealing temperatures. Post-spray annealing at the optimized values was subsequently performed on coatings produced with all three powder size distributions. A comprehensive characterization of the microstructure and mechanical properties, including tensile strength and wear resistance, was performed for coatings produced in the as-sprayed and heat-treated conditions. |
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