Driving force for γ → ε martensitic transformation and stacking fault energy of γ in Fe-Mn binary system

Young Kook Lee, Chong Sool Choi

Research output: Contribution to journalArticle

228 Citations (Scopus)

Abstract

A regular solution model for the difference of the chemical free energy between γ and ε phases during γ → ε martensitic transformation in the Fe-Mn binary system has been reexamined and partly modified based on many articles concerning the Ms and As temperatures of Fe-Mn alloys. Using the regular solution model, the measured Ms temperatures, and a thermodynamic model for the stacking fault energy (SFE) of austenite (γ), the driving force for γ→ ε martensitic transformation, and the SFE of γ have been calculated. The driving force for γ → ε martensitic transformation increases linearly from -68 to -120 J/mole with increasing Mn content from 16 to 24 wt pet. The SFE of γ decreases to approximately 13 at. pct Mn and then increases with increasing Mn content, which is in better agreement with Schumann's result rather than Volosevich el al.'s result.

Original languageEnglish
Pages (from-to)355-360
Number of pages6
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume31
Issue number2
DOIs
Publication statusPublished - 2000 Jan 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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