Abstract
The crystallization behaviors and structure of CaO-SiO2-MgO-Al2O3 melts representing the oxide inclusions in Si-Mn-killed steel were investigated. Raman spectroscopy analysis indicates that the degree of polymerization of oxide melts is lowered with increasing the CaO/SiO2 mass ratios or Li2O contents. Lowering the CaO/SiO2 mass ratios decreases the crystallization temperatures and suppresses crystallization of the oxide melts. Two crystalline phases precipitate (4CaO·MgO·Al2O3·3SiO2 and 3CaO·MgO·2SiO2 in sequence) during continuous cooling of oxide melts with the CaO/SiO2 mass ratios of 1.55 and 1.15. Only one crystalline phase (4CaO·MgO·Al2O3·3SiO2) was precipitated during the continuous cooling of the oxide melts with CaO/SiO2 mass ratio of 0.77. The crystallization ability of oxide melts was retarded with increasing the Li2O content. The crystalline phases precipitated sequentially are blocky 4CaO·MgO·Al2O3·3SiO2 and faceted 3CaO·MgO·2SiO2 irrespective of the Li2O content of oxide melts.
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