Abstract
The formation of CO(g) bubbles in Fe-C alloy droplets during spray-decarburization operations is described in terms of a homogeneous nucleation process enabled by the surface active properties of oxygen. An expression is obtained for the reversible work to form a vapor nucleus that includes electrostatic terms involved in forming a layer of chemisorbed oxygen ions. These additional terms make the critical nucleation conditions a sensitive function mainly of the oxygen content of the melt. The critical oxygen activity is found to be in the 0.001 to 0.003 wt pct range at 1823 K.
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