The application of a quasichemical solid solution model to carbon austenite
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The recent extensive data for the variation with temperature and composition of the activity of carbon in austenite has been analyzed using a quasichemical model for interstitial solid solutions. The most important parameter in the theoretical activity equation is the pairwise binding energy Δε between two nearest-neighbor solute atoms. A computer fitting method has shown that the new activity data for austenite, which spans a temperature range from 900° to 1400°C and compositions ranging from very dilute up to the limiting composition of the phase boundary, are compatible with the theoretical model with a Δε-value of -2 kcals per mole which is independent of both temperature and composition.
KeywordsAustenite Metallurgical Transaction Solute Atom Interstitial Solid Solution Octahedral Interstitial Site
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