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Oxidation of Metals

, Volume 32, Issue 1–2, pp 13–45 | Cite as

Internal-external transition for the oxidation of Fe-Cr-Ni austenitic stainless steels in steam

  • Nobuo Otsuka
  • Yoshiaki Shida
  • Hisao Fujikawa
Article

Abstract

Several Fe-Cr-Ni austenitic stainless steels (Cr wt.%: 13–25, Ni wt.%: 15) were oxidized in steam for 1000 hr at 500–900°C. The oxide scales were examined and categorized with respect to the chromium concentration and the grain size of the base metal. Experiments showed three conditions for the critical bulk Cr concentration and the oxidation temperature at which the oxidation behavior changed drastically. Metallographic examination showed that two of these three conditions resulted from the internal-external transition of Cr2O3 either on the metal surface or along the grain boundaries of the base metal. Attempts were made to interpret these conditions from the available oxidation theories. Atkinson's treatment was employed with some modification to incorporate the grain-boundary diffusion of Cr in the base metal. The calculation basically explained the internal-external transition for the oxidation of these steels.

Key words

steam oxidation external oxidation internal oxidation grain-size effect of the base metal austenitic stainless steels 

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Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • Nobuo Otsuka
    • 1
  • Yoshiaki Shida
    • 1
  • Hisao Fujikawa
    • 1
  1. 1.Research and Development DivisionSumitomo Metal Industries, Ltd.Amagasaki HyogoJapan

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