Beneficial effect of sulfur state on high-temperature steam oxidation resistance in high chromium ferritic steels

Masaaki Nakai, Yoshinori Murata, Masahiko Morinaga, Yasutoshi Sasaki

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The presence of sulfur (S) at an impurity level in high chromium (Cr) ferritic steels improves remarkably high-temperature steam oxidation resistance. However, it still remains unknown which S state in the steels gives such a beneficial effect. There are two possible S states in the steels; one is the soluble S state in a solid solution of the steel, and the other is the precipitated S state which occurs through the sulfide formation or the S segregation in grain boundaries. Either state appears depending on the S content and the heat-treatment temperature. In this study in order to elucidate the effective S state, high-temperature steam oxidation resistance was investigated with high Cr ferritic steels, by changing the S states in them by proper heat treatments. As the result, it was found that the precipitated S state operated more effectively to the improvement of steam oxidation resistance, as compared to the soluble S state.

Original languageEnglish
Pages (from-to)865-869
Number of pages5
JournalMaterials Transactions
Volume45
Issue number3
DOIs
Publication statusPublished - 2004 Mar

Keywords

  • Ferritic steel
  • Heat treatment
  • High temperature
  • Impurity
  • Steam oxidation
  • Sulfide
  • Sulfur
  • Water vapor

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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