Abstract
The characteristics of the inclusions as well as their contribution to intragranular acicular ferrite (IAF) nucleation in Mg-containing low-carbon steel were investigated via electron backscatter diffraction and transmission electron microscopy. Most inclusions changed from single-phase to complex with a fine size and dispersed distribution after Mg addition, which contributed to the IAF nucleation. The complex inclusions were composed of MgAl2O4, Mn3Al2Si3O12, α-MnS, and some small particles. MgAl2O4 was present in the core, and α-MnS and some small particles were distributed on the Mn3Al2Si3O12 periphery. The observed dislocations and twinning in α-MnS and Mn3Al2Si3O12 played a vital role in the IAF nucleation by reducing the ferrite nucleation energy. Our results may enhance the fundamental understanding of the IAF nucleation mechanism, which is of importance for the practical application of oxide metallurgy technology.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 51874137), Hebei Province Natural Science Fund (Nos. E2020209044, E2019209283), and Graduate Student Innovation Fund of North China University of Science and Technology (No. CXZZBS2018135).
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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Manuscript submitted October 7, 2020; accepted January 1, 2021.
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Wu, X., Wu, S., Yan, C. et al. Investigation of Inclusion Characteristics and Intragranular Acicular Ferrite Nucleation in Mg-Containing Low-Carbon Steel. Metall Mater Trans B 52, 1012–1022 (2021). https://doi.org/10.1007/s11663-021-02073-1
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DOI: https://doi.org/10.1007/s11663-021-02073-1