Zhao Haodong, Zhang Zhifeng, Bai Yuelong, Li Bao, Gao Mingwei
National Engineering & Technology Research Center for Non-Ferrous Metal Composites, GRINM Group, Beijing 100088, China.
GRINM Metal Composites Technology Co., Ltd., Beijing 100088, China.
Materials (Basel). 2022 Feb 28;15(5):1802. doi: 10.3390/ma15051802.
The internal coupled electromagnetic melt treatment (ICEMT) method is firstly proposed to produce high-quality and large-sized aluminum alloy billets. A three-dimensional model was established to describe the ICEMT process of direct chill casting (DC casting). The effect of ICEMT on the fluid flow patterns and temperature field in the DC casting of ϕ880 mm AA2219 billets is numerically analyzed. Moreover, the mechanisms of the ICEMT process on grain refinement and macrosegregation were discussed. The calculated results indicate that the electromagnetic field appears to be coupled circinate at the cross section of the melt, the fluid flow becomes unstable accompanied by the bias flow, and the temperature profiles are significantly more uniform. An experimental verification was conducted and the results prove that compared with traditional direct chill casting, the microstructures of the AA2219 large-scale billet under the ICEMT process are uniform and fine.
首次提出了内部耦合电磁熔体处理（ICEMT）方法来生产高质量、大尺寸的铝合金坯料。建立了一个三维模型来描述直接水冷铸造（DC铸造）的ICEMT过程。数值分析了ICEMT对直径880mm的AA2219坯料DC铸造过程中流体流动模式和温度场的影响。此外，还讨论了ICEMT过程对晶粒细化和宏观偏析的作用机制。计算结果表明，在熔体横截面上，电磁场呈现耦合环状，流体流动变得不稳定并伴有偏流，温度分布明显更加均匀。进行了实验验证，结果证明，与传统直接水冷铸造相比，在ICEMT过程下AA2219大型坯料的微观组织均匀且细小。
