Abstract
The Gibbs energies of formation of TiS and Ti4C2S2 from Ti, S and C solutes in austenite are evaluated on the basis of the solubility data measured by Swisher in the Fe-C-S-Ti system. These quantities are employed in equilibrium calculations applied to a series of Ti bearing steels. The results indicate that Ti4C2S2 is expected to predominate in Ti microalloyed steels, whereas both TiS and Ti4C2S2 are likely to be present in Ti modified extra-low-carbon IF steels. These predictions are in good agreement with the experimental observations reported by other researchers.
