MODELING OF OXYGEN ACTIVITY IN FE-NI-CR MELTS

The subject of this study is the thermodynamics of oxygen dissolved in Fe-Ni-Cr liquid alloys. The introduced model is based on a power seri es to express the logarithm of the activity coefficient of oxygen. The activity coefficients have been computed from experimental data found in literature, With the help of the described model it is possible to predict the activity coefficient for an arbitrary composition of the Fe-Ni-Cr melt and for temperatures between 1525 and 1625 degrees C. Th e results are compared with data published in literature. The analytic al description of the activity coefficient widely agrees with the avai lable experimental data.