NAZIRU I. FUSEINI, RONALD J. O’MALLEY
The post-calcium treatment evolution of alumina (Al 2O3) inclusions in aluminum-killed, calcium-treated steel was investigated to understand the morphological changes under high-oxygen supersaturation conditions. The objective was to track the evolution of inclusion morphology over time following calcium addition. A methodology involving time-resolved sampling and quenching, coupled with SEM-EDS analysis, was employed to capture the rapid changes in inclusion structures. Results revealed the formation of angular two-phase CaO–Al2O3–CaS inclusions in the first minute, which subsequently transformed into spherical forms of liquid calcium aluminates with varying compositions. The thermodynamic calculations supported the observed changes in composition and morphology, indicating a significant influence of calcium diffusion on the transformation processes. Additionally, the rates of formation and disappearance of different inclusion types were recorded, showing that the spherical inclusions evolved steadily and at a lower rate compared to angular inclusions. This research contributes to optimizing steel production processes by mitigating harmful non-metallic inclusions, thereby improving the mechanical properties of steel products.
@article{43d82d1a-ce80-4cc5-a8df-efb5378590f5,
title={Post-calcium Treatment Evolution of Alumina (Al 2O3) Inclusions Morphology},
author={NAZIRU I. FUSEINI and RONALD J. O’MALLEY},
year={2026},
language={en}
}TY - JOUR TI - Post-calcium Treatment Evolution of Alumina (Al 2O3) Inclusions Morphology AU - NAZIRU I. FUSEINI AU - RONALD J. O’MALLEY PY - 2026 LA - en ER -
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