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Effect of Mg addition on TiN inclusions in GCr15 bearing steel

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Abstract

Compared with the original GCr15 bearing steel, TiN inclusions are greatly reduced by the effect of Mg addition, and many different types of non-metallic Mg-containing inclusions were observed in Mg-treated GCr15 bearing steel which includes MgO, MgS·MnS, MgO–MgS·MnS, MgAl2O4–MgS·MnS, MgO–TiN, MgS·MnS–TiN, and MgO–MgS·MnS–TiN. The inclusion size distribution based on automatic inclusion analysis software shows that the number of inclusion with the size ranging from 1 to 3 μm increases obviously because a large amount of MgO, MgS·MnS, TiN inclusions containing Mg with smaller sizes are massively generated. In situ observation on the experimental steel by high-temperature confocal laser scanning microscopy confirms that MgO can provide nucleation sites for TiN. In addition, the MgS·MnS and MgO–MgS·MnS inclusions can also provide positions for the nucleation of TiN. Thermodynamic calculations indicate that after Mg addition to liquid steel, a large number of fine MgO inclusions are generated in the liquid steel because of the strong reactivity of Mg and O. At the same time, MgS precedes TiN precipitates in the solid–liquid two-phase region; thus, MgO and MgS·MnS can provide sites for TiN nucleation. At last, two possible formation pathways for the above various TiN inclusions containing Mg are discussed.

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Acknowledgements

The authors are grateful to the National Natural Science Foundation of China (Grant No. 51874170) for supporting this work.

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Authors and Affiliations

  1. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan, 114051, Liaoning, China

    Lei Cao, Guo-cheng Wang & Yuan-you Xiao

  2. Key Laboratory of Metallurgy Engineering Liaoning Province, University of Science and Technology Liaoning, Anshan, 114051, Liaoning, China

    Guo-cheng Wang & Yuan-you Xiao

  3. Steel Rolling Department, Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan, 063200, Hebei, China

    Rong-guang Yang

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  1. Lei Cao
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  2. Guo-cheng Wang
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Correspondence to Guo-cheng Wang.

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Cao, L., Wang, Gc., Xiao, Yy. et al. Effect of Mg addition on TiN inclusions in GCr15 bearing steel. J. Iron Steel Res. Int. 29, 925–938 (2022). https://doi.org/10.1007/s42243-022-00760-0

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  • DOI: https://doi.org/10.1007/s42243-022-00760-0

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