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Transactions of the Japan Institute of Metals, Vol. 2 No. 1 (1961)
pp.15-20

© 1961 The Japan Institute of Metals

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Interaction Parameters of Alloying Elements
in Molten Iron^{*}

Harue Wada^{**} and Tunezo Saito^{**}

Interaction parameters of alloying elements in molten iron were calculated with statistical thermodynamics by using relatively simple models. The interaction parameter ε_{C}^{(B)} between a substitutional solute B and a substitutional solute C is given by using the interchange energy W as follows:

ε _{C}^{(B)} = { - W_{AB} + W_{BC} - W_{AC}}/RT

and that between a substitutional solute B and a interstitial solute C is given by
ε_{C}^{(B)} = {W_{BC} - W_{AC}}/RT

The interchange energies in the above equations were estimated from the modified Mott's equation,
W=V^{M} (δ _{A} - δ _{B})^{2} - 23060 \barn (X_{A} - X_{B})^{2}

where δ_{A} and δ_{B} are the solubility parameters, and X_{A} and X_{B} are the electronegativities of the pure components, V^{M} is the molar volume of mixture, and n is the appropriate number of AB bond in the mixture.

The values of the interaction parameters thus calculated were compared with those determined experimentally in Fe-Cr-X, Fe-Ni-X, Fe-C-X and Fe-S-X systems, and reasonable agreements were obtained.
(Received February 25, 1961)

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