溶融鉄合金中の Mn の活量係数におよぼす C, Co, Ni, Si, Ti, V の影響

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A modified closed chamber method has been applied to determine the effect of the alloying element on the activity coefficient of manganese in liquid iron alloy. The results obtained are summarised as follows : (1) Interaction parameter e^<(X)>_<Mn> in liquid iron alloy at 1570℃ : e^<(C)>_<Mn>=-0.0538 [%C]<1.2, e^<(Si)>_<Mn>=-0.0327 [%Si]<2.8 e^<(Co)>_<Mn>=-0.0036 [%Co]<4.3, e^<(Ti)>_<Mn>=0.0192 [%Ti]<2.4 e^<(Ni)>_<Mn>=-0.0072 [%Ni]<3.5, e^<(V)>_<Mn>=0.0057 [%V]3.5 The value of e^<(C)>_<Mn> is in fairly good agreement with those of previous investigators obtained by a different method. (2) Enthalpy coefficient h^<(X)>_<Mn> and entropy coefficient s^<(X)>_<Mn> defined by Chipman et al. are obtained for X=C and Si as follows : e^<(C)>_<Mn>=-1.371(1/T)+0.690 (1550∿1600℃) e^<(Si)>_<Mn>=-1, 838(1/T)+0.964 (1545∿1620℃) h^<(C)>_<Mn>=-6, 270 cal/g-atom, h^<(Si)>_<Mn>=-8, 410 cal/g-atom s^<(C)>_<Mn>=-3.16 cal/(g-atom.deg), s^<(Si)>_<Mn>=-4.41 cal/(g-atom.deg) (3) In consideration of the large discrepancy in e^<(Si)>_<Mn> 's of the present authors and previous investigators, it is shown that H_2-H_2O method has a possibility of making considerable errors by the effects of hydrogen, oxygen, and SiO in determination of e^<(O)>_O, e^<(Si)>_<Si>, and e^<(Si)>_O, which were used to obtain e^<(Mn)>_<Si> by the previous investigators. (4) A regular periodic relation is found between the interaction parameter ε^<(X)>_<Mn> and atomic number of the alloying element X. (5) The interaction parameter ε^<(X)>_<Mn> shows a tendency to decrease with increasing the effective number of free electron n_<X, eff> of the alloying element X.
社団法人日本鉄鋼協会の論文
1974-03-01

溶融鉄合金中の Mn の活量係数におよぼす C, Co, Ni, Si, Ti, V の影響

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