Abstract
In this work, the effects of plasma nitriding (PN) and nitrocarburizing on HVOF-sprayed stainless steel nitride layers were investigated. 316 (austenitic), 17-4PH (precipitation hardening), and 410 (martensitic) stainless steels were plasma-nitrided and nitrocarburized using a N2 + H2 gas mixture and the gas mixture containing C2H2, respectively, at 550 °C. The results showed that the PN and nitrocarburizing produced a relatively thick nitrided layer consisting of a compound layer and an adjacent nitrogen diffusion layer depending on the crystal structures of the HVOF-sprayed stainless steel coatings. Also, the diffusion depth of nitrogen increased when a small amount of C2H2 (plasma nitrocarburizing process) was added. The PN and nitrocarburizing resulted in not only an increase of the surface hardness, but also improvement of the load bearing capacity of the HVOF-sprayed stainless steel coatings because of the formation of CrN, Fe3N, and Fe4N phases. Also, the plasma-nitrocarburized HVOF-sprayed 410 stainless steel had a superior surface microhardness and load bearing capacity due to the formation of Cr23C6 on the surface.
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This article is an invited paper selected from presentations at the 5th Asian Thermal Spray Conference (ATSC 2012) and has been expanded from the original presentation. ATSC 2012 was held at the Tsukuba International Congress Center, Ibaraki, Japan, November 26-28, 2012, and was organized by the Japan Thermal Spray Society and the Asian Thermal Spray Society.
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Park, G., Bae, G., Moon, K. et al. Effect of Plasma Nitriding and Nitrocarburizing on HVOF-Sprayed Stainless Steel Coatings. J Therm Spray Tech 22, 1366–1373 (2013). https://doi.org/10.1007/s11666-013-0035-4
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DOI: https://doi.org/10.1007/s11666-013-0035-4