Silicon-Oxygen Equilibrium in δ-iron at the Solid-Liquid Equilibrium Temperature

Abstract

Experiments were carried out using the zone melting technique on the silicon-oxygen equilibrium in δ-iron at the solid-liquid equilibrium temperature.
The deoxidation constant with silicon in liquid iron was log K_Si(l)=-5.18([%Si(l)]<0.64) at this temperature, which is in good agreement with the values given in the literature.
The silicon-oxygen equilibrium relationship in o-iron at the solid-liquid equilibrium temperature is represented by the following equations: log{a_Si(s)•a_O(s)²/aSiO₂}=-7.19([%Si(s)]≤0.5) logf^Si_Si(s)=0.086[%Si(s)] logf^O_Si(s)=-15.9[%O(s)] logf^Si_O(s)=-9.05[%Si(s)]+30[%Si(s)]² ([%Si(s)]≤0.1) logf^o_o(s)≅0.