Abstract
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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