Paper Title:
Study of the S Phases Formed on Plasma-Nitrided Austenitic and Ferritic Stainless Steels
  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.

  Info
Periodical
Materials Science Forum (Volumes 638-642)
Main Theme
Edited by
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
Pages
775-780
DOI
10.4028/www.scientific.net/MSF.638-642.775
Citation
L.C. Gontijo, R. Machado, L.C. Casteletti, S.E. Kuri, P. A.P. Nascente, "Study of the S Phases Formed on Plasma-Nitrided Austenitic and Ferritic Stainless Steels", Materials Science Forum, Vols. 638-642, pp. 775-780, 2010
Online since
January 2010
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$32.00
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