Effects of Niobium and Sulfur on the Activity of Carbon in High Carbon Liquid Steel and Relations between Interaction Parameters ε^x_c and Carbon Potential

Abstract

Fe-C-Nb or Fe-C-S ternary alloy was equilibrated with the CO-CO₂ gas mixture having a constant carbon potential at 1550°C, and the effects of niobium and sulfur on the activity of carbon in liquid steel were investigated.
The interaction perameters at constant carbon concentration were determined as follows:
(εN^bC)N_C, (N_Nb=0)=-63,
(ξSC)_NC, (N_S=0)=11.
The relations between interaction parameters (εXC)αC, (εXC)N_C carbon potentials were discussed about 10 additional elements (X=Co, Cr, Cu, Mo, Nb, Ni, S, Sn, V, W) at 1550°C, and estimated as the function of carbon concentration.