固液平衡温度におけるδ-鉄中の Mn および Si の活量

概要

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The equilibrium relationship between solid and liquid has been studied for Fe-Mn-Si ternary system. The solid-liquid equilibrium temperature can be related to the concentrations of Mn and Si in liquid iron alloy as follows : t_e(℃)=1538-4.73[%Mn(l)]-11.4[%Si(l)] From measured solid-liquid equilibrium distribution ratio, the activity coefficients of Mn and Si in δ-iron are calculated. The results obtained are as follows : lnγ^°_<Mn>(s)=0.44 ε^<Mn>_<Mn>(s)=-0.9 lnγ^°_<Si>(s)=-6.83 ε^<Si>_<Si>(s)=10.4 ε^<Si>_<Mn>(s)=ε^<Mn>_<Si>(s)=-13 where pure solid Mn and Si are taken as the standard states. Using these results, the composition of δ-iron in equilibrium with liquid Fe-Mn-Si alloy can be calculated. log[%Mn(s)]=-0.144+log[%Mn(l)]+0.004[%Mn(s)] -(4.69/T)[%Mn(l)]+0.12[%Si(s)] +(-1838/T+0.964)[%Si(l)] log[%Si(s)]=-0.152+log[%Si(l)]-0.086[%Si(s)] +0.074[%Si(l)]+0.057[%Mn(s)] +(-939.6/T+0.495)[%Mn(l)] T=t_e+273 [%i(s)] : Weight percentage of component i in solid phase (δ-iron) [%i(l)] : Weight percentage of component i in liquid phase
1978-02-01