Deoxidation Characteristics and Shape Modification of Deoxidation Products with Al-Ce and Al-Y Complex Deoxidizers

Abstract

The purpose of this investigation is to study the deoxidation characteristic of Al-Ce, Al-Y complex deoxidizers and the shape modification of deoxidation products formed in molten iron with the complex deoxidation. The complex deoxidizers used in the present work are ferroalloys consisted of aluminum and cerium or yttrium (110 mol%).
(1) The rate of deoxidation with complex deoxidizer and the minimum oxygen content in molten iron are only a little worse than those for aluminum deoxidation.
(2) The shape of deoxidation products changes from dendritic to grobular with increasing cerium or yttrium content in the complex deoxidizer. At 10 mol% of cerium or yttrium content all deoxidation products become grobular.
(3) The shape modification of deoxidation products, resulting from deoxidation with complex deoxidizer, is explained qualitatively in terms of the formation mechanism of oxide in supercooled melt.