LOW-TEMPERATURE TOUGHNESS OF 6%Mn STEELS.

Masato Murakami, Koji Shibata, Toshio Fujita

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Fe-Mn alloys have microstructures similar to those of Fe-Ni alloys in iron-rich regions; therefore they have potentials as structural materials at cryogenic temperatures. Fe-Mn alloys, however, lose their toughness by catastrophic intergranular failure when tested at low temperatures. This is attributed to the segregation of impurities to grain boundaries. The segregation can take place at higher temperatures than 600 degree C, in both austenite( gamma ) and two-phase( alpha plus gamma ) regions. An addition of molybdenum has been found to be effective in reducing the segregation of phosphorus in the two-phase region and enhancing toughness. However, no perceivable difference was observed in segregation in the gamma field. Double temper has been also identified as a beneficial treatment for improving toughness, which promoted the reversion of austenite along grain boundaries and reduced the susceptibility to intergranular failure.

Original languageEnglish
Pages (from-to)241-248
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume72
Issue number2
DOIs
Publication statusPublished - 1986 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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