THERMODYNAMICS OF MARTENSITIC TRANSFORMATION IN Fe-Mn-C AND Fe-Ni-C ALLOYS

Abstract

Abstract: A Central Atom Model is introduced and the LFG and Hsu models are modified in order to evaluate the driving force for the martensitic transformation in Fe-Mn-C and Fe-Ni-C al- loys.The results show that the relationship between the driving force and the yield strength of austenite at Ms temperature,σ_(0.2)~γ/M_s,fits Hsu's formula;ΔG~=2.1σ_(0.2)~γ/M_s+907 J/mol.The M_s temperatures of Fe-Mn-C and Fe-Ni-C alloys are also calculated.The calculated results are in good agreement with experimental values.

Key words: Fe-Mn-C alloy, Fe-Ni-C alloy, martensitic transformation

XU Zuyao(T.Y.Hsu) PAN Mu Shanghai Jiaotong University,Shanghai,China Correspondent:XU Zuyao(T.Y.Hsu) Professor,Department of Materials Science,Shanghai Jiaotong University,Shanghai,China. THERMODYNAMICS OF MARTENSITIC TRANSFORMATION IN Fe-Mn-C AND Fe-Ni-C ALLOYS[J]. Acta Metallurgica Sinica (English Letters), 1990, 3(1): 16-21.

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THERMODYNAMICS OF MARTENSITIC TRANSFORMATION IN Fe-Mn-C AND Fe-Ni-C ALLOYS

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