NAZIRU I. FUSEINI, RONALD J. O’MALLEY
This study investigates the post-calcium morphological evolution of Al2O3 inclusions formed under high-oxygen supersaturation (approximately 1000 ppm) in aluminum-killed, calcium-treated steel. Time-resolved sampling and quenching techniques were used, along with SEM-EDS analysis, to characterize the transition of angular two-phase CaO·Al2O3-CaS inclusions into spherical liquid 12CaO·7Al2O3 and CaO·Al2O3 with an encasing thin layer of CaS. Within the first minute post-calcium addition, the CaS phase took on a cone-cap shape, which later converted to a spherical form around modified CaO·Al2O3 inclusions by the second minute. The compositional evolution was attributed to reoxidation effects increasing CaO content, enabling rapid calcium diffusion, which transformed angular inclusions into liquid calcium aluminates. Thermodynamic calculations corroborated the observed inclusion dynamics. Furthermore, the evolution rates of spherical Al2O3 and calcium aluminates inclusions were steady and lower than those observed for angular inclusions. This understanding enhances the knowledge of inclusion behavior in steelmaking processes, ultimately contributing to cleaner steel production efforts.
@article{423d7136-7864-47de-bbf0-d3511e906dd0,
title={2026 Naziru I. Fuseini Post calcium Treatment Evolution of Alumina Al2O3 Inclusions Morphology s11663 025 03909 w},
author={NAZIRU I. FUSEINI and RONALD J. O’MALLEY},
year={2026},
language={en}
}TY - JOUR TI - 2026 Naziru I. Fuseini Post calcium Treatment Evolution of Alumina Al2O3 Inclusions Morphology s11663 025 03909 w AU - NAZIRU I. FUSEINI AU - RONALD J. O’MALLEY PY - 2026 LA - en ER -
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