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Evolution Behavior of Non-metallic Inclusions in High-Al or Si-Alloyed Steel Reacting With CaO–Al2O3–FeO–SiO2–MgO Slag

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Abstract

The effect of the reaction between alloy elements and slag on the evolution behavior of non-metallic inclusions in high-Al or Si-alloyed steel melts was investigated at 1873 K (1600 °C). Aluminum (1.5 mass pct) added to the molten steel produces an alumina-rich inclusion by reaction with oxygen, and it reduces FeO by the interfacial reaction with the CaO–Al2O3–FeO–SiO2–MgO slag, resulting in an increase of the alumina content of the slag. On the other hand, silicon (4.0 mass pct) added to the molten steel increases the silica content of the slag by the interfacial reactions with the slag and causing aluminum pick-up from the liquid slag into the molten steel, which changed the existing silica-rich inclusion into aluminum-rich inclusions. The addition of each of the two alloying elements produced alumina-rich inclusions, and the two series of existing alumina inclusions were modified into MgAl2O4 spinel inclusions by picking up magnesium from the slag into the molten steel. Through a population density function (PDF) analysis of inclusion particles, we confirmed that inclusion growth occurred by diffusion of magnesium and aluminum in steel with 1.5 pct Al or 4.0 pct Si. The supersaturation degree for alumina inclusions in the 1.5 pct Al-added steel and 4.0 pct Si-added steel continued to decrease as the reaction time increased. As a result, dendritic or spherical alumina inclusions were observed in both series at 1 minute of alloying, and small, independently present polygonal-shaped MgAl2O4 spinel inclusions were mainly observed at 30 minutes of alloying.

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Acknowledgments

This work was supported by the Competency Development Program for Industry Specialists from the Korea Institute for Advancement of Technology (KIAT, Grant Number P0002019) and the Korea Evaluation Institute of Industrial Technology (KEIT, Grant Number 20009956), funded by the Ministry of Trade, Industry and Energy (MOTIE), Korea. Also, the authors express their appreciation to the anonymous reviewers' fruitful comments to improve the present article.

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Authors and Affiliations

  1. Department of Materials Science and Chemical Engineering, Hanyang University, Ansan, 15588, Korea

    Dong Woon Kim, Tae Sung Kim, Geun Ho Park & Joo Hyun Park

  2. Steelmaking Research Group, Technical Research Laboratory, Hyundai Steel, Dangjin, 31719, Korea

    Dong Woon Kim, Tae Sung Kim & Geun Ho Park

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Kim, D.W., Kim, T.S., Park, G.H. et al. Evolution Behavior of Non-metallic Inclusions in High-Al or Si-Alloyed Steel Reacting With CaO–Al2O3–FeO–SiO2–MgO Slag. Metall Mater Trans B 55, 446–460 (2024). https://doi.org/10.1007/s11663-023-02969-0

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