Abstract
The coefficients of equilibrium partition of solute elements between austenite and liquid iron were evaluated thermodynamically for Fe–C–base quaternary systems. The validity of the calculation was examined in comparison with the measured coefficients of solute elements in some quaternary systems. The equilibrium partition coefficient of the third element i in an Fe–C–base quaternary system is affected by two factors: the effects of the fourth element j on the interaction between carbon and the third element and the interaction between the third and fourth elements. Most of the combinations of the third and fourth elements in Fe–C–i–j quaternary systems showed a relatively small interaction between the elements i and j except the combination of chromium and titanium, which exhibited an explicit influence of titanium on the partition coefficient of chromium. It was concluded that the partition coefficients in Fe–C–base multicomponent systems differed little from those in Fe–C–base ternary systems, with a few exceptions.
MST/220
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