Thermodynamic Interactions of Nb and Mo on Ti in Liquid Iron

Abstract

Thermodynamic interactions of niobium and molybdenum on titanium in liquid iron were studied in the temperature range of 1873∼1973 K by measuring the effects of niobium and molybdenum on the solubility product for TiN formation in liquid iron using the metal-nitride-gas equilibration technique. The experimental results were thermodynamically analyzed using Wagner’s interaction parameter formalism to determine the first-order interaction parameters of niobium and molybdenum on titanium in liquid iron as 0.0495±0.0049 and 0.01±0.0026, respectively, at 1873 K. Temperature dependence of these parameters was also determined as follows. e_Ti^Nb = 1160/T - 0.570, e_Ti^Mo = 0.01 (1873∼1973 K)