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运用有限差分法,对超轻Mg-Li合金(LA141)板坯直冷连铸过程温度场进行数值模拟,根据实际过程的物理现象以及文献资料确定包括一冷区、二冷区在内的边界条件,并且考虑底模与铸坯之间随着铸坯的变形而引起的换热系数的变化。通过计算铸坯内温度场的分布,固-液界面的形状和位置,分析各种铸造参数,包括浇注温度、冷却水量、铸造速度等对连铸过程的影响。另外也比较了在同等铸造条件下LA141铸坯和AZ31铸坯铸造过程中凝固前沿的形状。
The finite difference method was used to simulate the temperature field in the process of direct cold-continuous casting of ultra-light Mg-Li alloy (LA141) slabs. The boundary between the cold zone and the cold zone was determined according to the physical phenomena and literature Conditions, and consider the bottom mold and the slab with the deformation of the slab caused by the heat transfer coefficient changes. Through calculating the distribution of temperature field, the shape and position of solid-liquid interface, various casting parameters were analyzed, including the influence of pouring temperature, cooling water quantity and casting speed on the continuous casting process. In addition, the shape of the solidification front in the casting of LA141 and AZ31 slabs under the same casting conditions was also compared.