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HomeMaterials Science ForumMaterials Science Forum Vols. 638-642Study of the S Phases Formed on Plasma-Nitrided...

Study of the S Phases Formed on Plasma-Nitrided Austenitic and Ferritic Stainless Steels

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Abstract:

An expanded austenite layer is formed on the surfaces of austenitic stainless steels that are nitrided under low-temperature plasma. This S phase is an iron alloy metastable phase supersaturated with nitrogen. We have identified a similar expanded ferrite or ferritic S phase for nitrided ferritic (BCC) stainless steels. Samples of austenitic AISI 304L and AISI 316L and ferritic AISI 409L stainless steels were plasma-nitrided at 350, 400, 450 and 500°C, and the structural and corrosion characteristics of the modified layers were analyzed by X-ray diffraction (XRD) and electrochemical tests. For the austenitic AISI 304L stainless steel, the results showed that a hard S phase layer was formed on the surface, without corrosion resistance degradation, by using low plasma temperatures (350 and 400°C). A similar behavior was observed for the austenitic AISI 316L stainless steel: the modified layers formed at 350 and 400°C were constituted mainly by the S phase. Plasma-nitriding treatment of the ferritic AISI 409L stainless steel caused the formation of a layer having high amount of nitrogen. XRD measurements indicated high strain states for the modified layers formed on the three stainless steels, being more pronounced for the ferritic S phase.

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Periodical:

Materials Science Forum (Volumes 638-642)

Pages:

775-780

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.775

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Online since:

January 2010

Authors:

L.C. Gontijo, R. Machado, L.C. Casteletti, S.E. Kuri, Pedro A.P. Nascente

Keywords:

Corrosion, Plasma Nitriding, S Phase, Stainless Steel (SS)

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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