Thermodynamic Interaction between Chromium and Titanium in Liquid Fe–Cr Alloys Containing 30 mass% Cr

Abstract

Thermodynamic interaction of chromium on titanium in liquid Fe–Cr alloys was studied by measuring the effect of chromium on the solubility product of TiN in liquid Fe–Cr–Ti–N alloys by the metal–nitride–gas equilibration technique in the temperature range from 1873 to 1973 K. Titanium nitride formed in the melt was identified as a pure solid stoichiometric TiN. As the chromium content increases in the melt saturated with TiN, the critical nitrogen solubility increases significantly, while the titanium solubility decreases. Using Wagner's formalism, the present results were thermodynamically analyzed to determine the first- and the second-order interaction parameters between chromium and titanium given as follows.
e_Ti^Cr = 406.7/T−0.1933  r_Ti^Cr = −20.6/T−0.011  (0 < mass% Cr < 30)