Thermodynamic consideration of the effect of alloying elements on martensitic transformation in Fe-Mn-Si based alloys

X.J. Jin; D. Dunne; S.M. Allen; R.C. O'Handley; T.Y. Hsu (Xu Zuyao)

doi:doi:10.1051/jp4:2003903

Numéro		J. Phys. IV France Volume 112, October 2003


Page(s)		369 - 372
DOI		https://doi.org/10.1051/jp4:2003903

J. Phys. IV France 112 (2003) 369
DOI: 10.1051/jp4:2003903

Thermodynamic consideration of the effect of alloying elements on martensitic transformation in Fe-Mn-Si based alloys

X.J. Jin^{1, 2}, D. Dunne³, S.M. Allen², R.C. O'Handley² and T.Y. Hsu (Xu Zuyao)¹

¹ School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 20030, China
² Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A.
³ Department of Materials Engineering, University of Wollongong, Wollongong, NSW 2522, Australia

Abstract
The critical driving force for martensitic transformation, the stacking fault energy of parent phase at the start martensite start temperature Ms and the influence of anti-ferromagnetic transition on the Gibbs energy of Fe-Mn-Si alloys have been reviewed. The Gibbs energies of the fcc( $\gamma$ ) and hcp( $\varepsilon$ ) phases as a function of temperature have also been evaluated for Fe-Mn-Si-Cr quaternary alloys. The critical driving force for martensitic transformation in a representative quaternary alloy (Fe-26.4Mn-6.2Si-5.2Cr) was determined to be-145.25 J/mol, significantly lower than the value for Fe-30Mn-6Si, implying that the substitution of Cr for Mn decreases the stacking fault energy of the austenite.