用元胞自动机方法模拟镁合金薄带双辊铸轧过程凝固组织

用元胞自动机方法模拟铸轧凝固组织，采用有限元方法模拟铸轧过程中熔池内部的宏观传输现象，将二者耦合模拟了镁合金铸轧薄带凝固过程中晶粒的形核与长大过程.阐明了薄带铸轧工艺过程中的主要工艺参数（浇注温度、铸轧速度等）对镁合金薄带凝固组织中晶粒大小、取向等的影响规律.这为通过工艺优化来控制铸轧薄带的凝固组织提供了理论依据. 关键词： 双辊铸轧 镁合金 凝固组织 元胞自动机

Modelling of solidification microstructure evolution of twin-roll casting magnesium strip using cellular automaton

Cellular automaton （CA） is applied to simulating the microstructure evolution during the solidification， and finite element method （FEM） was used for solving the conservation equations which govern the macro-transport phenomena during the twin-roll casting process of the magnesium strip in the molten pool. Coupling CA with FEM can predict the microstructure evolution during solidification involving nucleation and growth of the grains. On the basis of this CA-FEM method，the effects of the main parameters involving pouring temperature， casting speed and pool height on the characteristic of solidification microstructure such as grain size and orientation can be quantitatively clarified by numerical simulation， which can provide the theoretical basis for the optimization of the processing parameters and the control of the solidification structure.