Microstructural evolution and oxidation behavior of nanocrystalline 316-stainless steel coatings produced by high-velocity oxygen fuel spraying
Maggy L. Lau, Enrique J. Lavernia
Materials Science
Abstract
The microstructural evolution and oxidation behavior of nanocrystalline 316-stainless steel coatings produced by high-velocity oxygen fuel spraying is described. Stainless steel powders with a particle size in the range of 45–11 mm were mechanically milled for 10 h in liquid nitrogen to produce powders with a nanocrystalline grain size of 2198 nm and an aspect ratio of 1.68. The cryomilled powders were subsequently sprayed onto a stainless steel substrate by high-velocity oxygen f...Moreuel spraying. The resultant coating exhibited a superior microhardness, despite an increased porosity, over that of the conventional coating sprayed with the same parameters. Transmission electron microscopy performed on the cross-sections of the nanocrystalline coating revealed the splat formation with a thickness ranging from 40 to 400 nm. Various oxide phases (Cr2O3, FeO, Fe2O3 and g-Fe2O3) in the stainless steel matrix were identified using selected area diffraction. This observation suggests that in-flight oxidation may have occurred during spraying and:or during splat formation. ? 1999 Elsevier Science S.A.
keywords:Oxidation kinetics; Nanocrystalline material; Stainless steel (316) coating
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