Abstract: Based on the characteristics of vertical type twin-roll casting process， the finite element method was used to analyze the three-dimensional steady conservation equations for transport phenomena in the pool region of the twin-roll strip casting for the magnesium alloy.The smart-sizing algorithm of ANSYS software was used to divide finite element mesh， and the coupled simulations of temperature field， velocity field and the solidification process in the molten pool were performed. The effects of main control parameters， such as the casting speed， pouring temperature on the flow field， temperature field and the final point of solidification in the molten pool， were analyzed. The results showed that with the increase of the pouring temperature and the casting speed， the temperature at the exit of the molten pool increases and the final point of solidification moves toward the exit. On the basis of the simulation results， the optimized process parameters of twin-roll casting process for Mg alloy are also given as: the pouring temperature is in 640~660℃ and the casting speed is in 20~30m/min.

Key words: twin-roll casting, magnesium alloy, numerical simulation, macroscopic transport, finite element method