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Metallurgical and Materials Transactions A

, Volume 31, Issue 2, pp 355–360 | Cite as

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

  • Young-Kook Lee
  • Chongsool Choi
Article

Abstract

A regular solution model for the difference of the chemical free energy between γ and ε phases during γε martensitic transformation in the Fe-Mn binary system has been reexamined and partly modified based on many articles concerning the M s and A s temperatures of Fe-Mn alloys. Using the regular solution model, the measured M s temperatures, and a thermodynamic model for the stacking fault energy (SFE) of austenite (γ), the driving force for γε martensitic transformation, and the SFE of γ have been calculated. The driving force for γε martensitic transformation increases linearly from − 68 to − 120 J/mole with increasing Mn content from 16 to 24 wt pct. 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 et al.’s result.

Keywords

Austenite Material Transaction Martensitic Transformation Stack Fault Energy Regular Solution Model 
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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2000

Authors and Affiliations

  • Young-Kook Lee
    • 1
  • Chongsool Choi
    • 2
  1. 1.the Division of EngineeringColorado School of MinesGolden
  2. 2.the Department of Metallurgical EngineeringYonsei UniversitySeoulSouth Korea

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