In the comparative experiments of vibration and non-vibration cast-rolling, it is found that the vibration can significantly enhance the dynamic recrystallization effect in the plastic deformation stage during cast-rolling. In order to explore the strengthening mechanism, the physical simulation experiment and the numerical simulation based on Yada model are used to study the plastic deformation stage of the cast-rolling process. The research results show that the Yada model can accurately calculate the change history of grain size during vibration rolling. It is also found that the vibration frequency can promote the recrystallization nucleation by changing the equivalent plastic strain in the cast-rolling strip during deformation, thereby effectively reducing the average grain size, whereas the amplitude only affects the start time of the dynamic recrystallization. In addition, it is found that vibration can effectively improve the uneven distribution of grain size on the cross section of cast-rolling strip.

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Twin-roll strip cast-rolling is a frontier process which produces a metallic strip directly from the melt. The main idea behind the presented research is to develop a new type of sectional roll surface heat transfer boundary condition. On this basis, a numerical simulation model of heat-flow coupling considering solidification was established to support the new boundary condition (BC). Finally, the simulation results are consistent with the experimental data, which verifies the BC. Meanwhile, the process parameters were optimized in depth through the model.