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| ON THERMODYNAMIC CALCULATION OF Ms AND ON DRIVING FORCE FOR MARTENSITIC TRANSFORMATION IN Fe-C |
| XU Zuyao(T. Y. Hsu); ZHANG Hongbing; LUO Shoufu (Shanghai Jiaotong University) (Manuscript received 7 February; 1983) |
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Cite this article:
XU Zuyao(T. Y. Hsu); ZHANG Hongbing; LUO Shoufu (Shanghai Jiaotong University) (Manuscript received 7 February; 1983). ON THERMODYNAMIC CALCULATION OF Ms AND ON DRIVING FORCE FOR MARTENSITIC TRANSFORMATION IN Fe-C. Acta Metall Sin, 1984, 20(3): 151-161.
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Abstract In order to suit the calculation with computer, △G_(Fe)~(γ-α) from various authors are formulated. Ms from various △G_(Fe)~(γ-α) and different models for evaluation of △G_(Fe)~(γ-α), e. g. refined Fither, KRC, LFG and Hsu's are obtained. Comparison is made among these results. The calculated Ms depends on not only the evaluation model of △G~(γ-α) but also △G_(Fe)~(γ-α). Both LFG treatment with △G_(Fe)~(γ-α) from Mogutnov and Hsu's model with △G_(Fe)~(γ-α) from Kaufman et al. are in good agreement with the experimental M_s. However Hsu's model is much simpler than the general accepted LFG's M_s of Fe-C with x_c=0.01 to 0.05 are detected rather accurately and they are consistent with that given by Kaufman et al. Ms of Fe-C with x_c=0.06 by Greninger seems too high. The calculated driving force depends on not only the evaluation model of △G~(γ-α) but also mainly △G_(Fe)~(γ-α) and M_s adopted. It is more likely that the driving force increases with the increament of carbon content.
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Received: 18 March 1984
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