Prediction of All Component Activities in Iron-Based Liquid Ternary Alloys Containing Phosphorus, Titanium, and Vanadium

To carry out thermodynamic calculation of removing P, Ti, and V from liquid iron, their activity data are indispensable. The molecular interaction volume model (MIVM) was used to predict them. Its effectiveness and reliability in the Fe-Cr-P and Fe-Mn-P alloys were verified by comparing the predicted values of activity of all components with their experimental data. All component activities in the Fe-Ti-P, Fe-V-P, Cr-Mn-P, and Fe-Ti-V liquid alloys were predicted. Their thermodynamic behavior showed some interesting tendencies from the predicted iso-activity curves in the ternary alloys. The results indicated that the MIVM was superior to the unified interaction parameter formalism (UIPF) and might replace the Wagner interaction parameter formalism (WIPF) or the Wagner consistent formalism (WCF) theoretically because it is of clearer physical meaning and its extrapolation is more credible.