(1. 苏州有色金属研究院，苏州 215026；2. 大连理工大学 铸造工程研究中心，大连 116023)
摘 要: 通过数值模拟与试验研究的方法，采用软接触电磁铸造技术制备7050高强铝合金扁铸锭。模拟结果表明，施加软接触电磁场后，铸锭内部的流动场和温度场分布均发生改变。试验结果表明：采用电磁软接触铸造技术后，铸锭表面粗糙度由常规铸造时的101.1 mm降低至48.6 mm，平均晶粒由常规铸造时的80~85 mm细化至55~ 70 mm，晶粒尺寸不均匀度由常规铸造的21.69%降低至11.50%；此外，采用电磁软接触铸造工艺后，铸锭的合金化元素偏析得到抑制，Zn、 Mg、 Cu三元素的最大偏析率分别由常规铸造时的6.62%、9.54%、7.92%降低至3.87%、3.63%、1.36%，合金化元素分布更加均匀。
关键字: 7050铝合金；电磁软接触铸造；细化；偏析；数值模拟
soft-contact electromagnetic DC casting 7050 high-strength alloy ingot
（1.Suzhou Institute for Nonferrous Metal Process Technology, Suzhou 215026, China;
2. Research Center of Foundry Engineering, Dalian University of Technology, Dalian 116023, China）
Abstract:By the numerical simulation and experimental investigation, the 7050 ingots were successfully produced by soft-contact electromagnetic demicontinuous casting (SEC). Simulation results show that fluid flow field and thermal field inside the ingot are changed by the electromagnetic field. Experimental results show that, with the soft-contact electromagnetic casting, the surface roughness of the ingot decreases from 101.1 mm to 48.6 mm, the grain size and grain unevenness of ingots decrease from 80−85 mm and 21.69% to 55−70 mm and 11.50%, respectively. The segregations of alloying elements Zn, Mg and Cu are suppressed by applying the soft-contact electromagnetic field. In the demicontinuous (DC) casting, the segregation rates of alloying elements Zn, Mg and Cu are 6.62%, 9.54% and 7.92%, respectively. After applying the soft-contact electromagnetic field, the segregation rates of alloying elements Zn, Mg and Cu decrease to 3.87%, 3.63% and 1.36%, respectively. The distributions of alloying elements are more uniform.
Key words: 7050 aluminum alloys; soft-contact electromagnetic demicontinuous casting (SEC); refinement; segregation; numerical simulation
