Materials Transactions Online

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

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 εC(B) between a substitutional solute B and a substitutional solute C is given by using the interchange energy W as follows:

ε C(B) = { - WAB + WBC - WAC}/RT
and that between a substitutional solute B and a interstitial solute C is given by
εC(B) = {WBC - WAC}/RT
The interchange energies in the above equations were estimated from the modified Mott's equation,
W=VMA - δ B)2 - 23060 \barn (XA - XB)2
where δA and δB are the solubility parameters, and XA and XB are the electronegativities of the pure components, VM 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)


* The Research Institute of Mineral Dressing and Metallurgy, Tohoku University, Sendai, Japan.

** This papar was published in Japanese in the Journal of the Japan Institute of Metals, 25 (1961), 159.

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