(1. 蘇州有色金屬研究院，蘇州 215026；2. 大連理工大學 鑄造工程研究中心，大連 116023)
摘 要: 通過數(shù)值模擬與試驗研究的方法，采用軟接觸電磁鑄造技術制備7050高強鋁合金扁鑄錠。模擬結果表明，施加軟接觸電磁場后，鑄錠內(nèi)部的流動場和溫度場分布均發(fā)生改變。試驗結果表明：采用電磁軟接觸鑄造技術后，鑄錠表面粗糙度由常規(guī)鑄造時的101.1 mm降低至48.6 mm，平均晶粒由常規(guī)鑄造時的80~85 mm細化至55~ 70 mm，晶粒尺寸不均勻度由常規(guī)鑄造的21.69%降低至11.50%；此外，采用電磁軟接觸鑄造工藝后，鑄錠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別由常規(guī)鑄造時的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勻。
關鍵字: 7050鋁合金；電磁軟接觸鑄造；細化；偏析；數(shù)值模擬
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
