Abstract
Laboratory experiments and theoretical analyses were performed to study the effect of magnesium on non-metallic inclusions in a high sulfur steel with 2.3, 13, 24, and 42 ppm magnesium. With the increase of magnesium content in the molten steel, inclusions of Al2O3-CaO were first modified to Al2O3-MgO and MgO-CaS(-MgS)-MnS, then transformed to MgO-CaS-MgS-MnS and Al2O3-MgO, and finally MgS-MgO-CaS-MnS in the water-quenched samples. Thermodynamic calculation results revealed that the evolution path of inclusions in the molten steel with magnesium was Al2O3-CaO → Al2O3-MgO-CaS → CaS-MgO-MgS → MgS-CaS-MnS-MgO, which were in good agreement with the experimental results. With the increase of magnesium in the molten steel from 2.3 to 42 ppm, the number density and area fraction of inclusions increased from 10.04 #/mm2 and 31.96 × 10−6 to 50.82 #/mm2 and 117.93 × 10−6, respectively, which was owing to the generation of magnesium-containing inclusions especially when the content of magnesium was higher than 24 ppm. The formation of magnesium-containing inclusions in the molten steel inhibited the precipitation of aggregated type II MnS inclusions in the solid steel, sulfide inclusions were spherical or near-spherical with dispersive distributions. Quantitative results of two-dimensional and three-dimensional distribution of inclusions based on the SEM–EDS analysis and the non-aqueous solution electrolytic method showed that the roundness and size of inclusions in the solid steel decreased first with 13 ppm magnesium, higher content of magnesium promoted the formation of complex MnS-MgS-MgO-CaS inclusions with higher roundness and size. Thermodynamic calculation results showed that an appropriate amount of 4.0-16.0 ppm magnesium was beneficial to improve the distribution of sulfide in the high sulfur steel.
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Acknowledgments
The authors are grateful for support from the National Science Foundation China (Grant No. U1860206, No. 51725402), the High Steel Center (HSC) at Yanshan University, and Beijing International Center of Advanced and Intelligent Manufacturing of High Quality Steel Materials (ICSM), Beijing Key Laboratory of Green Recycling and Extraction of Metals (GREM), and the High Quality Steel Consortium (HQSC) at University of Science and Technology Beijing, China.
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Ji, S., Zhang, L. & Wang, X. Effect of Magnesium on Inclusions in a High Sulfur Steel. Metall Mater Trans B 53, 848–863 (2022). https://doi.org/10.1007/s11663-022-02446-0
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DOI: https://doi.org/10.1007/s11663-022-02446-0