|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials Processing Fundamentals
||Evolution and Formation of CaS-bearing Inclusion in Low-Carbon Al-killed Steel
||Yanhui Sun, Xuefeng Bai
|On-Site Speaker (Planned)
Evolution of CaS-bearing inclusion characteristics (size, composition, morphology, structure) in low-carbon Al-killed and Ca-treated steel was investigated systematically in industrial trials. Analysis methods include scanning electron microscopy (SEM), inclusion classifier feature (INCA FEATURE) and energy dispersive spectroscopy (EDS). Moreover, classical thermodynamics and software Factsage were applied to calculate the stability diagram and equilibrium precipitation of inclusions during refining and solidification process. The results indicated that the formation of CaS-bearing inclusion in steel can form in three ways. The first is that CaS acts as an intermediate reaction product modifying Al2O3 inclusions shortly after calcium treatment and then the mixture converts to xCaO•yAl2O3. The second is that [S] and [Al] reacts with CaO in liquid CaO-Al2O3 (-MgO) inclusion during secondary refining and continuous casting. The third one is that CaS could precipitate on the surface of low modified MgO•Al2O3 spinel and Al2O3 core during solidification.
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