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Numerical simulations of solidification and hot tearing for continuous casting of duplex stainless steel

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Abstract

Hot tearing is one of the major defects in continuous casting of steels, which severely limits the productivity of steelmaking processes. To further understand the defect, the problem of hot tearing in duplex stainless steel produced by a vertical continuous caster was investigated. A three-dimensional heat transfer and elastic–plastic model was developed based on the realistic roller layout in continuous slab casting, using ProCAST software. According to the hot tearing indicator criterion, the influence of operating parameters on the hot tearing susceptibility was evaluated. The results show that the surface temperature distribution is not sensitive to the superheat. The center of wide surface shell at the mold exit is the thinnest, and the thickness is about 10.52 mm at the superheat temperature of 40 °C. The hot tearing mainly concentrates on the slab solidification front and near the narrow face. However, corner cracks are prone to appear near the corner. With the increase in casting speed and the decrease in the cooling intensity in the secondary cooling zone, the solidification end point is rushed, which leads to the position of hot tearing lowering accordingly.

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Acknowledgements

The authors gratefully express their appreciation to the National Natural Science Foundation of China (No. 51474143) for the financial support.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai, 200072, China

    Shan-shan Liu, Bo Wang, Yu Yao, Jun-kai Huang, Zheng Chen & Jie-yu Zhang

  2. School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China

    Shan-shan Liu, Bo Wang, Yu Yao, Jun-kai Huang, Zheng Chen & Jie-yu Zhang

  3. Inner Mongolia Key Laboratory of Graphite and Graphene for Energy Storage and Coating, Huhhot, 010051, Inner Mongolia, China

    Liang Bai

  4. Inner Mongolia University of Technology, Huhhot, 010051, Inner Mongolia, China

    Liang Bai

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  1. Shan-shan Liu
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Correspondence to Bo Wang.

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Liu, Ss., Bai, L., Wang, B. et al. Numerical simulations of solidification and hot tearing for continuous casting of duplex stainless steel. J. Iron Steel Res. Int. 27, 643–655 (2020). https://doi.org/10.1007/s42243-020-00406-z

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  • DOI: https://doi.org/10.1007/s42243-020-00406-z

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