纯铜热型连铸过程三维微观组织模拟

3-D Simulation of Microstructure of Pure Cu in Heated Mould Continuous Casting

采用宏观温度场模拟与微观组织模拟相耦合的方法,建立了宏微观统一的模型[直接差分(DirectDifference)-元胞自动控制(CellularAutomaton)模型,即CA-DD模型],模拟研究了纯铜热型连铸凝固过程各工艺参数对固-液界面位置和晶粒淘汰的影响。结果表明:随着连铸速度的增大,固-液界面逐渐向型口外侧移动,晶粒淘汰趋势逐渐减弱。铸型温度对晶粒淘汰有一定的影响。模拟结果与试验结果符合较好。

Using the macro-microcosmic coupling method, a combinative macro-microcosmic model (direct difference-cellular automaton model, that is CA-DD model) has been established to simulate effects of various processing parameters on the shape of solid-liquid interface and crystal competitive growth of pure Cu in heated mould continuous casting. The results show that with the increase of drawing velocity, the position of solid-liquid interface moves from the inner to the outer of the mould, and the competition of crystal is wore off. Mould temperature has the obvious effects on the competitive growth of the crystal.