Abstract
Samples taken from laboratory-produced 3rd generation advanced high-strength steels, solidified at a low cooling rate, have been investigated to study the characteristics of non-metallic inclusions. Two steels, containing 2 and 5 pct Mn content, were produced for this purpose. A higher number of total inclusions were observed in 5 pct Mn steel. The four main types of inclusions observed were Al2O3, AlN, MnS, and AlSiMn-oxide. These classes were divided into subclasses according to variations in their chemistry. The major subclasses of AlN inclusions are either plate-like or regular in shape and have different size distributions. Thermodynamic calculations suggest that plate-like AlN inclusions are formed at the initial stage of solidification, while faceted/regular-shaped inclusions are precipitated toward the end of solidification. Moreover, it was found that the size of nitride inclusions is related to their N content. This phenomenon is discussed from the viewpoint of nucleation theory.
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Acknowledgments
We express gratitude to the Natural Sciences and Engineering Research Council of Canada (Project No. 20002139) for the financial support for this work. Further, we thank Dr. Stanley Sun and Ms. Sun Li, ArcelorMittal Dofasco, for their valuable time and fruitful discussions. The authors also acknowledge Canadian Centre for Electron Microscopy (CCEM) at McMaster University for assistance with SEM analysis.
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Manuscript submitted December 25, 2018.
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Nabeel, M., Alba, M., Karasev, A. et al. Characterization of Inclusions in 3rd Generation Advanced High-Strength Steels. Metall Mater Trans B 50, 1674–1685 (2019). https://doi.org/10.1007/s11663-019-01605-0
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DOI: https://doi.org/10.1007/s11663-019-01605-0