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Aggregation of CeAlO3 inclusions in heavy ingot of a steel containing 0.007% aluminum

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Abstract

The distribution of inclusions at the bottom of a Ce-treated heavy steel ingot was detected and calculated. The three-dimensional morphology and spatial distribution of CeAlO3 clusters were characterized using the electrolytic extraction and Micro-CT detection. A model of inclusion collision to predict the aggregation of CeAlO3 inclusions in the ingot was established and validated by measured results. Inclusions were mainly CeAlO3 and a small amount of Ce2O2S in the tundish after cerium treatment. The collision and aggregation of inclusions led to the formation of large clusters in the ingot during the solidification process. Large slag entrainment inclusions, large CeAlO3 clusters and small CeAlO3 particles were observed from the center to the edge of the ingot bottom. Large inclusions were mainly concentrated at the center. The number density of inclusions larger than 200 μm was 0.21 mm−3. The maximum diameter of CeAlO3 clusters was 1340 μm. From the edge to the radial center and from the bottom to the top, the average diameter of inclusions gradually increased due to the longer solidification time of the ingot.

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Acknowledgements

The authors are grateful for the support from National Key R&D Program (No. 2023YFB3709900), the National Natural Science Foundation of China (Grant Nos. U22A20171 and 52104343), the Natural Science Foundation of Hebei Province (Grant No. E2021203222) and the High Steel Center (HSC) at Yanshan University and North China University of Technology, China.

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Authors and Affiliations

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

    Qiu-yue Zhou & Ying Ren

  2. School of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, Hebei, China

    Jun-tao Ba, Lun Zhang & Wei Chen

  3. School of Mechanical and Materials Engineering, North China University of Technology, Beijing, 100144, China

    Li-feng Zhang

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  1. Qiu-yue Zhou
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  2. Jun-tao Ba
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Correspondence to Ying Ren or Li-feng Zhang.

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Zhou, Qy., Ba, Jt., Zhang, L. et al. Aggregation of CeAlO3 inclusions in heavy ingot of a steel containing 0.007% aluminum. J. Iron Steel Res. Int. (2024). https://doi.org/10.1007/s42243-023-01154-6

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  • DOI: https://doi.org/10.1007/s42243-023-01154-6

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