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Evolution of plasticized MnO-Al2O3-SiO2-based nonmetallic inclusion in 18wt%Cr-8wt%Ni stainless steel and its properties during soaking process

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Abstract

The properties of MnO-Al2O3-SiO2-based plasticized inclusion are likely to change during soaking process due to its low melting point. In this study, the evolution of the MnO-Al2O3-SiO2-based inclusion of 18wt%Cr-8wt%Ni stainless steel under isothermal soaking process at 1250°C for different times was investigated by laboratory-scale experiments and thermodynamic analysis. The results showed that the inclusion population density increased at the first stage and then decreased while their average size first decreased and then increased. In addition, almost no Cr2O3-concentrated regions existed within the inclusion before soaking, but more and more Cr2O3 precipitates were formed during soaking. Furthermore, the plasticity of the inclusion deteriorated due to a decrease in the amount of liquid phase and an increase in the high-melting-point-phase MnO-Cr2O3 spinel after the soaking process. In-situ observations by high-temperature confocal laser scanning microscopy (CLSM) confirmed that liquid phases were produced in the inclusions and the inclusions grew rather quickly during the soaking process. Both the experimental results and thermodynamic analysis conclude that there are three routes for inclusion evolution during the soaking process. In particular, Ostwald ripening plays an important role in the inclusion evolution, i.e., MnO-Al2O3-SiO2-based inclusions grow by absorbing the newly precipitated smaller-size MnO-Cr2O3 inclusions.

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Acknowledgements

The work was financially supported by the National Science Foundation for Young Scientists of China (No. 5170402), the China Postdoctoral Fund (No. 2018M630071), the Fundamental Research Funds for the Central Universities (No. RF-TP-19-030A2), and the Joint Funds of the National Natural Science Foundation of China (No. U1560203).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Jing Guo, Yan Yan & Han-jie Guo

  2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Xing-run Chen

  3. Jiuquan Iron and Steel Group Corporation, Jiayuguan, 735100, China

    Xing-run Chen

  4. Beijing Shougang Co. Ltd., Qian’an, 064400, China

    Shao-wei Han

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  1. Jing Guo
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  2. Xing-run Chen
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  3. Shao-wei Han
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  4. Yan Yan
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  5. Han-jie Guo
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Correspondence to Jing Guo.

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Guo, J., Chen, Xr., Han, Sw. et al. Evolution of plasticized MnO-Al2O3-SiO2-based nonmetallic inclusion in 18wt%Cr-8wt%Ni stainless steel and its properties during soaking process. Int J Miner Metall Mater 27, 328–339 (2020). https://doi.org/10.1007/s12613-019-1945-z

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  • DOI: https://doi.org/10.1007/s12613-019-1945-z

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