ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Effect of Li2O Addition on Crystallization Behavior of CaO–Al2O3–MgO Based Inclusions
Tomoko SugimuraTetsushi DeuraKoichi SakamotoSohei SukenagaNoritaka SaitoKunihiko Nakashima
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2011 Volume 51 Issue 12 Pages 1982-1986


The crystallization behavior of CaO–Al2O3–MgO oxide powder which is one of the major non-metallic inclusions in Al-killed steel was systematically examined in the present study. 33mass%CaO–62mass% Al2O3–5mass%MgO and 30mass%CaO–57mass% Al2O3–5mass%MgO–8mass%Li2O glass powders were heat-treated at 1073–1673 K for 8–512 s under air.
CaO–Al2O3–MgO glass was found to be crystallized immediately after the heat treatments. Moreover, it was revealed that the addition of Li2O accelerated the crystallization of the glass powders, and controlled aggregation of crystal particles. Additionally, the indentation hardness of crystallized glasses after 512 s heat-treatments was investigated by using a nano-indenter. The addition of Li2O had the effect of lowering the hardness of samples, which indicates that Li2O would improve the deformation behavior of aluminate based inclusions.

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© 2011 by The Iron and Steel Institute of Japan
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