Abstract
The effect of the initial oxygen content on the formation of a layer-like inclusions group was investigated by dropping an aluminum bar onto static liquid iron containing various amounts of oxygen. Chromium and carbon were also added in the liquid iron to control the initial oxygen content and the influences of both elements on the formation of the inclusions group were investigated. The results were;
(1) No formation of the inclusions group was confirmed at the low initial oxygen content in the liquid iron.
(2) This phenomenon was discussed successfully from the viewpoint of the effect of oxygen content on the interfacial energy between liquid iron and solid alumina.
(3) Ferro-carbon alloys yielded the same results as in the case of pure iron, but ferro-chromium alloys with the relatively higher oxygen content resulted in no formation of this group.
(4) These results were explained in terms of the effect of high chromium content on oxygen activity in liquid steel.
