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| THERMODYNAMIC CALCULATION OF M_S AND DRIVING FORCE FOR MARTENSITIC TRANSFORMATION IN Fe-Mn-C ALLOYS |
| ZHANG Hongbing NI Lemin (Shanghai Technical College of Metallurgy);XU Zuyao (T.Y.Hsu)(Shanghai Jiaotong University) |
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Cite this article:
ZHANG Hongbing NI Lemin (Shanghai Technical College of Metallurgy);XU Zuyao (T.Y.Hsu)(Shanghai Jiaotong University). THERMODYNAMIC CALCULATION OF M_S AND DRIVING FORCE FOR MARTENSITIC TRANSFORMATION IN Fe-Mn-C ALLOYS. Acta Metall Sin, 1987, 23(1): 42-49.
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Abstract The M_s temperatures of Fe-Mn-C alloys have been calculated by the appli- cation of LFG model of △G~(γ→α) with Mogutnov's △G_(Fe)~(γ→α),Hsu-A model with Orr-Chipman's △_(Fe)G~(γ→α) and Hsu-B model with Orr-Chipman's △G_(Fe)~(γ→α) and are in good agreement with the experimental values.Through the mathematical treatment, the relationship between Ms and the composition of Fe-Mn-C alloys can be ob- tained as: M_s(K)=817.4-7513.4x_C-4141.9x_(Mn)-32083.5x_cx_(Mn) (LFG model with Mogutnov's △_(Fe)G~(γ→α)); M_s(K)=829.9-7580.5x_C-4166.0x_(Mn)-15727.Sx_cx_(Mn) (Hsu-A model with Orr-Chipman's △G_(Fe)~(γ→α)); M_s(K)=829.2-7276.1x_C-2915.4x_(Mn)-43825.7x_cx_(Mn) (Hsu-B model with Orr-Chipman's △G_(Fe)~(γ→α)) in which the linear correlation coefficient of these relations are larger than 0.992. Both C and Mn depress M_s linearly and the effect of C is almost two-fold stro- nger than that of Mn.Introduction of an interaction term(x_Cx_(Mn)) between alloying elements in the present treatment shows that C and Mn enhance the effect upon M_s of each other.The driving force for transformation increases monotonically with C and Mn content and there is no singularity.The ealculted M_s and the driving force largely depend on the △G~(γ→α) model and △_(Fe)G~(γ→α) values adopted.
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Received: 18 January 1987
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