Statistical thermodynamic approach to molten Fe–Cr–P

Shohoji, Nobumitsu; Marques, Sofia Figueiredo

http://hdl.handle.net/10400.9/718

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Authors

Shohoji, Nobumitsu

Marques, Sofia Figueiredo

Abstract(s)

Statistical thermodynamic analysis was applied to the available phosphorus solubility data set for molten Fe1 –yCryPx given as functions of Cr composition y, temperature T and phosphorus activity a(P) under the assumption that the solubility limit x of P in the molten Fe1-yCry was 0.50 irrespective of y. The evaluated values of the energy parameter representing the extent of stability of P atoms in the molten Fe1– yCryPx showed an apparently realistic variation pattern with y for the level of y up to 0.465. Further, it was demonstrated by an interpolating estimation using the obtained statistical thermodynamic parameter values at two known levels of y that a(P) vs. x relationships for arbitrary y at specified T could be derived with acceptable accuracy.

Keywords

Molten nitrates Non-stoichiometry Interstitial compound Phosphorus activity Statistical thermodynamics

URI

http://hdl.handle.net/10400.9/718

Citation

Shohoji, Nobumitsu; Marques, S. F. Statistical thermodynamic approach to molten Fe–Cr–P. In: International Journal of Materials Research (formely Zeitschrift für Metallkunde), 2008, vol. 99, nº 3, p. 245-250