5th International Conference on Advances in Solidification Processes (ICASP-5) 5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining (CSSCR-5)

Twin roll casting (TRC) is an energy efficient way of producing Mg alloy sheet for lightweight applications. However, unfavourable microstructural features, such as columnar grains and centreline segregation, are present in the as-cast alloy sheet. By modelling the effects of casting parameters, melt conditioning and material parameters on microstructure development, feedback can be provided to optimise the TRC process to improve the quality of TRC strip. A multiscale model is used to simulate the evolution of microstructure during TRC, in which the process of grain growth in fluid flow is modelled via phase field simulation coupled with a lattice Boltzmann model, and a Lagrangian macroscale model is applied for heat transfer analysis, which provides the boundary conditions for the microscale grain growth model. Results from the macroscale model can be used to deduce the upper bound casting speed, thus allowing manufacturing efficiency to be improved, and the deformation zone to be reduced, which is particularly favourable in TRC of Mg alloys.