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Improving ingot homogeneity by modified hot-top pulsed magneto-oscillation

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Abstract

Heavy ingots, especially the ingot of more than 10 t, often contain detrimental heterogeneous defects, such as macrosegregation, shrinkage pipes, and cracks. Hot-top pulsed magneto-oscillation (HPMO) can refine the solidified structure of ingot and improve their homogeneity. However, it may exacerbate the positive segregation at the upper part of the ingot body. Thus, a round table HPMO riser with a feeding part was designed, and the microstructure and macrosegregation of Al–Si alloy ingots solidified with and without HPMO were investigated. The simulation and experimental results indicated that round table HPMO riser could enable fine and uniform solidified structures in the whole ingot body; in the meantime, feeding part allowed the melt with enriched solute to gather in the upper part of the riser until the last solidification stage of ingot. This provides an effective approach for obtaining highly homogenized ingots.

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Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (Nos. 2020YFB2008400 and 2017YFB0701800) and the National Natural Science Foundation of China (No. U1760204). In addition, the authors would like to thank Hui Shao and Zi-hao Yin from Center for Advanced Solidification Technology, Shanghai University for their help in the experiment and data analysis.

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Authors and Affiliations

  1. Center for Advanced Solidification Technology, Shanghai University, Shanghai, 200444, China

    Fan Zhang, Hong-gang Zhong, Yu-qian Yang, Ren-xing Li & Qi-jie Zhai

  2. Daye Special Steel Co., Ltd., Huangshi, 214429, Hubei, China

    Ming-xu Pan

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  1. Fan Zhang
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  2. Hong-gang Zhong
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  3. Yu-qian Yang
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Correspondence to Hong-gang Zhong.

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Zhang, F., Zhong, Hg., Yang, Yq. et al. Improving ingot homogeneity by modified hot-top pulsed magneto-oscillation. J. Iron Steel Res. Int. 29, 1939–1950 (2022). https://doi.org/10.1007/s42243-022-00785-5

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  • DOI: https://doi.org/10.1007/s42243-022-00785-5

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