Abstract
In the current study, thermodynamic calculations and laboratory experiments were conducted to investigate the evolution of MgO–Al2O3 inclusions in a GCr15-bearing steel with varied Mg contents. Inclusions were transformed from Al2O3 to MgO–Al2O3 to MgO in the steel with the increase of Mg content from 3.9 to 61.0 ppm. The agglomeration of MgO–Al2O3 inclusions was in situ observed using the confocal scanning laser microscopy. With the increase of the MgO content in MgO–Al2O3 inclusions, the collision tendency of MgO–Al2O3 complex inclusions became weaker. The agglomeration attraction force of MgO–Al2O3 inclusions was calculated using Newton’s second law, which was obviously related to the distance between inclusions and the type of inclusions. With the decrease of the distance between inclusions, the attractive force between Al2O3 inclusions increased from 1.0 × 10–15 to 1.0 × 10–13 N, while it was 1.0 × 10–16 to 1.0 × 10–14 N for MgO–Al2O3 complex inclusions and 1.0 × 10–17 to 1.0 × 10–15 N for pure MgO inclusions, respectively. The height difference of the molten steel around the inclusion pushed two inclusions closer. The impelling effect of the molten steel on inclusions became stronger with the increase of the height difference. Based on the calculation of the simplified Kralchevsky–Paunov model and experimental results, the capillary attraction between inclusion pairs was Al2O3 > MgO–Al2O3 > MgO.
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14 June 2023
A Correction to this paper has been published: https://doi.org/10.1007/s11663-023-02831-3
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Acknowledgments
This work was financially supported by the National Nature Science Foundation of China (No. U22A20171 and 51874032). The authors are also grateful for support from the High Steel Center (HSC) at North China University of Technology and University of Science and Technology Bei**g (USTB).
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Wu, M., Ren, C., Ren, Y. et al. In Situ Observation of the Agglomeration of MgO–Al2O3 Inclusions on the Surface of a Molten GCr15-Bearing Steel. Metall Mater Trans B 54, 1159–1173 (2023). https://doi.org/10.1007/s11663-023-02751-2
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DOI: https://doi.org/10.1007/s11663-023-02751-2