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相场法由于避免了追踪固液界面而在立方晶体材料研究中广泛应用。模拟采用三维自适应网格划分方法,加速计算进程、通过反复模拟以获得收敛性结果的方法,确定并消除网格各向异性。首先,研究了界面能各向异性参数对Fe-C合金枝晶取向的影响,通过枝晶取向及形貌的对比,选择合适的界面能各向异性参数。随后,定量研究了成分过冷对枝晶尖端半径、尖端生长速度、临界稳定系数等枝晶尖端参数的影响。
Phase-field method is widely used in the research of cubic crystal materials because it avoids the tracking of solid-liquid interface. The simulation uses a three-dimensional adaptive meshing method to accelerate the calculation of the process and to obtain a convergent result by repeated simulations to determine and eliminate the grid anisotropy. Firstly, the effect of interfacial anisotropy parameters on the dendrite orientation of Fe-C alloy was studied. By comparing the dendrite orientation and morphology, the suitable interfacial anisotropy parameters were selected. Subsequently, the effects of component undercooling on dendritic tip parameters such as tip radius, tip growth rate and critical stability coefficient were studied quantitatively.