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Fe-X-C系马氏体相变时的△G_(Fe-X-C)~(γ→α)为:△G_(Fe-X-C)~(γ→α)=_(xFe)△G_Fe~(γ→α)+_(XC)RT×ln_(γ_C~α/γ_C~γ)+x_i△G_i~(γ→α)+△Ω~(γ→α)其中γ_C~α和γ_C~γ分别表示碳在Fe-X-C系铁素体和奥氏体内的活度系数.对Fe-Ni-C和Fe-Cr-C系所求得的M_S值和实验值很好符合.碳在Fe-X-C系的活度值及对奥氏体的强化作用主要决定Fe-X-C系的M_s值.碳是决定Fe-X-C系相变驱动力的主要元素.
△ G_ (Fe-XC) ~ (γ → α) in the martensitic transformation of Fe-XC is ΔG_ (Fe-XC) ~ (γ → α) = _ (xFe) ΔG_Fe ~ (γ → α γ + α α γ γ γ + α α γ γ + γ α α + γ γ + γ α - γ γ + Fe-XC ferrite and austenite activity coefficient. For the Fe-Ni-C and Fe-Cr-C obtained by the M_S values and experimental values well in the carbon in the Fe-XC Department of Activity value and the strengthening effect on austenite mainly determine the M_s value of Fe-XC system. Carbon is the main element that determines the driving force for the transformation of Fe-XC system.