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Effect of hollow insulation riser on shrinkage porosity and solidification structure of ingot

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Abstract

The thermal insulation performance of riser is very important to the shrinkage porosity and solidification structure of ingot, but it is difficult to significantly improve due to the limit of thermal conductivity of riser material. A new type of hollow insulation riser was proposed based on the low thermal conductivity of air, which aims to improve the thermal insulation performance of riser. A 14.5-t steel ingot was prepared using the hollow insulation riser, and the casting temperature was 1500 °C. The temperature evolution of the external surface of mold during solidification was measured using an infrared temperature instrument. A numerical model was established to simulate the porosity and solidification structure of ingot. The reliability of numerical simulation was verified by comparing simulation and experimental results. Results show that the insulation performance of the riser can be significantly improved through application of the hollow insulation sleeve. Compared with solid insulation sleeve, the shrinkage cavity depth was decreased and the position of porosity was raised when hollow insulation riser was applied.

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Acknowledgements

The authors are grateful for the financial support from State Key Laboratory of Metal Material for Marine Equipment and Application (Grant No. SKLMEA-USTL-201705) and the National Natural Science Foundation of China (Grant No. 51974153).

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Authors and Affiliations

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

    Ying-jie Liu, Wan-ming Li, Ming-gang Shen, Kun Liu, Yusuf Abba Yusuf & Chang-you Cai

  2. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan, 114000, Liaoning, China

    Ying-jie Liu, Chun-lin Peng, Xiao-lei Zhu, Xiang-wei Liao, Chong-yi Wei & Ji Yang

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  1. Ying-jie Liu
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  2. Chun-lin Peng
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  6. Xiang-wei Liao
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  7. Kun Liu
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  9. Yusuf Abba Yusuf
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  10. Ji Yang
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Correspondence to Wan-ming Li or Xiao-lei Zhu.

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Liu, Yj., Peng, Cl., Li, Wm. et al. Effect of hollow insulation riser on shrinkage porosity and solidification structure of ingot. J. Iron Steel Res. Int. 29, 1951–1960 (2022). https://doi.org/10.1007/s42243-022-00790-8

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  • DOI: https://doi.org/10.1007/s42243-022-00790-8

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