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.
|Number of pages
|Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
|Published - 2000
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys