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Acta Metall Sin  1980, Vol. 16 Issue (4): 426-429    DOI:
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THERMODYNAMICS OF THE MARTENSITIC TRANSFORMATION IN Fe-X-C SYSTEMS
Xu Zuyao (T. Y. Hsu) Shanghai Jiaotong University
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Xu Zuyao (T. Y. Hsu) Shanghai Jiaotong University. THERMODYNAMICS OF THE MARTENSITIC TRANSFORMATION IN Fe-X-C SYSTEMS. Acta Metall Sin, 1980, 16(4): 426-429.

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Abstract  The △G_(Fe-X-C)~(γ→α) in the martensitic transformation in Fe-X-C system is sugges-ted as: △G_(Fe-X-C)~(γ→α)=x_(Fe)△G_(Fe-X-C)~(γ→α)+x_C RT lnγ_C~α/γ_C~γ+x_i△G_i~(γ→α) +△Ω~(γ→α)where γ_C~α and γ_C~γ are activity of carbon in Fe-X-C ferrite and austenite respec-tively. The M_s of Fe-Ni-C and Fe-Cr-C obtained in present work are in goodagreement with the experimental results, showing that the above equation inavailable and convenient for application. The M_s of Fe-X-C system mainlydepends upon the activity of carbon in Fe-X-C and the strengthening effect onaustenite and carbon play an important role to determine the driving force of themartensite transformation in Fe-X-C.
Received:  18 April 1980     
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