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Mechanism and control of nonuniform phase transformation of microalloyed dual-phase steel during cooling process after hot rolling

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Abstract

After cooling in the hot rolling process, the metallographic structure of microalloyed dual-phase steel is nonuniform along the rolling direction, while the thickness fluctuation of microalloyed dual-phase steel with a nonuniform metallographic structure will occur during cold rolling. The mechanism of nonuniform phase transformation of microalloyed dual-phase steels was studied during the cooling process after hot rolling, and the nonuniform phase transformation of microalloyed dual-phase steel was regulated during the cooling process after hot rolling through process optimization. First, the empirical equation of phase transformation temperature was measured by a dilatometer considering thermal expansion. Then, the phase field and temperature field of laminar cooling process were calculated to provide initial boundary conditions for the finite element model. After that, the coupling finite element model of the temperature phase transformation of the strip steel in coiling transportation process was established. The simulation results show that the different thermal contact conditions of the microalloyed dual-phase steel during coil transportation lead to uneven cooling of the coil, which leads to nonuniform transformation of the coil along the rolling direction. In addition, by prolonging the time interval from coiling to unloading, the phenomenon of nonuniform phase transformation of microalloyed dual-phase steel can be effectively controlled. The simulation results are applied to industrial production. The application results show that prolonging the time interval from coiling to unloading can effectively improve the nonuniform phase transformation of microalloyed dual-phase steel in the cooling process after hot rolling.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. 52004029).

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Authors and Affiliations

  1. National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing, University of Science and Technology Beijing, Beijing, 100083, China

    Wen-quan Sun, Sheng-yi Yong, Tie-heng Yuan, Chao Liu & Rui-chun Guo

  2. Strip Production Plant, Xichang Steel and Vanadium Corporation of Pangang Group, Xichang, 615000, Sichuan, China

    San-bao Zhou & Meng-xia Tang

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  1. Wen-quan Sun
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  2. Sheng-yi Yong
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  4. Chao Liu
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Correspondence to Wen-quan Sun.

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Sun, Wq., Yong, Sy., Yuan, Th. et al. Mechanism and control of nonuniform phase transformation of microalloyed dual-phase steel during cooling process after hot rolling. J. Iron Steel Res. Int. 31, 428–441 (2024). https://doi.org/10.1007/s42243-023-00961-1

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