INTERACTION OF Ce AGAINST Cu,P OR Ti IN Fe-BASE SOLUTION

The equilibrium product in Fe-Cu-Ce,Fe-P-Ce or Fe-Ti-Ce solution have ben Mentifiedto be CeOS,but not the intermetallic compounds of Ce against Cu,P or Ti.The equilibriumeonstant of CeOS=2[Ce]+2[O]+[S] and the interaction coefficients between solutes inFe-base solution have been determined as follows:K=2.57×10e=-0.49;e~P=1.77;e=-3.62e=-0.22;e=0.39;e=-1.23ε=-128.0;ε~P=-224.1;ε=-710.0Ce decreases the activities of Cu and Ti in Fe-base solution and increases their solubifities,aswell as increases the activity of P and decreases its solubility.