铜单晶铸过程中固液界面位置和形状的数值分析

为了准确地控制工艺参数，获得表面光洁、高质量的连铸铜单晶，采用数值分析方法研究铜单晶连铸时固液界面的位置和形状.发现铸型温度(TM)、连铸速度(v)、冷却位置(L)和熔体温度(TL)影响固液界面的位置和形状，并且铜单晶连铸时固液界面向熔体呈凸出形状.当固液界面位于铸型内距出口端2～3mm时，可获得表面光洁、晶体取向度小于10°的连铸铜单晶.为了获得高质量的单晶，固-液界面面必须平滑，甚至是平界面.计算结果与实验结果吻合很好，可用数值分析方法确定连铸铜单晶的工艺参数，为铜单晶连铸提供理论依据.

Numerical Analysis forPosition and Shape of Solid-Liquid Interface during Continuous Casting of Single CrystalCu

In order to accurately control various technology parameters, and obtain high quality single crystal Cu rod with mirror-smooth surface, the position and shape of solid-liquid interface were analyzed during continuous casting of single crystal Cu by numerical analysis. The results show that the solid-liquid interface is a convex shape during the continuous casting. It is found that the mould temperature, the casting speed, the melt temperature and the cooling distance have effects on the position and shape of solid-liquid interface. When the solid-liquid interface is located in the mould and 2～3 mm distant from the mould exit, single crystal Cu rod with mirror-smooth surface can be obtained, its deviation of crystal orientation is less than 10°. In order to produce high quality single crystal, the solid-liquid interface morphology must be smooth, even be plane. The calculated results are in conformity well with the experimental results. The technological parameters are confirmed by numerical analysis, which provides a theoretical basis for production of high quality single crystal Cu.