Activity of Ti and V in iron melts

Abstract

Thermodynamic data regarding the formation of the nitrides TiN and VN in iron melts were obtained by Ser’eznov at Moscow Institute of Steel and Alloys on improved Sieverts equipment by a compensation method of measuring the pressure and gas volume using a highly sensitive pressure sensor. The use of this very reliable method to investigate gas–metal interactions was first proposed by Ponomarev and implemented at Chelyabinsk Research Institute. The experimental data obtained in the present work are used to calculate the activity coefficients of Ti and V in dilute solutions based on iron. Refined reference data regarding the Gibbs energy of vanadium-nitride formation from its elements are employed here. The results for the activity coefficients γ_Ti.1873^∞ = 0.055 and γ_V.1873^∞ = 0.24 are in good agreement with literature values.