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Behaviour of Sulphide and Non-alumina-Based Oxide Inclusions in Ca-Treated High-Carbon Steel

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Abstract

Although alumina-based inclusions in Al-killed steel have been widely investigated, few studies focus on non-metallic inclusions in Si-killed steel. Most high-carbon steel, which is expected to have higher potential for the formation of alumina, is deoxidised by silicon to avoid alumina-based inclusions. Many types of high-carbon steel such as free-cutting steel and grinding media for the mining industry include sulphur and calcium; therefore, non-alumina-based oxide and CaS-based inclusions co-exist in molten steel. In this study, the behaviour of sulphide and non-alumina-based oxide inclusions in Ca-treated liquid steel was investigated via transition of the composition and morphology in the liquid state. Using a confocal scanning laser microscope (CSLM), sulphide particles being pulled toward oxide inclusions were directly observed and changes in the composition of inclusions investigated using different analytical techniques. We identified two types of sulphide phase after remelting and cooling, polygonal particles and a ring-shaped layer around the oxide phase. When the sulphide capacity Cs multiplied liquid fraction of oxide had a higher value, the sulphide layer tended to become wider.

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Acknowledgments

This research was financially supported under the Australian Research Council’s Industrial Transformation Research Hub funding scheme (project IH130200025). Y. T. thanks Nippon Steel & Sumitomo Metal Corp., Japan, for financial support for his PhD study in UNSW Sydney. The authors acknowledge the facilities and scientific and technical assistance of the Australian Microscopy & Microanalysis Research Facility at the Electron Microscope Unit, The University of New South Wales.

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Authors and Affiliations

  1. Centre for Sustainable Materials Research and Technology, SMaRT@UNSW, School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW, 2052, Australia

    Yasuhiro Tanaka, Farshid Pahlevani & Veena Sahajwalla

  2. Steelmaking Division, Yawata works, Nippon Steel & Sumitomo Metal Corporation, 1-1 Tobihatacho, Tobata-ku, Kitakyushu, Fukuoka, 804-8501, Japan

    Yasuhiro Tanaka

  3. Institute of Multidiciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan

    Shin-ya Kitamura

  4. Electron Microscope Unit, UNSW Sydney, Sydney, NSW, 2052, Australia

    Karen Privat

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  1. Yasuhiro Tanaka
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  2. Farshid Pahlevani
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  3. Shin-ya Kitamura
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  4. Karen Privat
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  5. Veena Sahajwalla
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Correspondence to Farshid Pahlevani.

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Manuscript submitted December 17, 2018.

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Tanaka, Y., Pahlevani, F., Kitamura, Sy. et al. Behaviour of Sulphide and Non-alumina-Based Oxide Inclusions in Ca-Treated High-Carbon Steel. Metall Mater Trans B 51, 1384–1394 (2020). https://doi.org/10.1007/s11663-020-01872-2

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  • DOI: https://doi.org/10.1007/s11663-020-01872-2

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