结合电磁搅拌和机械搅拌,提出一种新型耦合搅拌技术,并利用该技术制备直径为300 mm的7075铝合金铸锭,研究该技术对半连续铸造参数、熔体温度波动、铸造液穴、铸锭组织和成分以及合金流变应力的影响.结果表明:相比普通半连续铸造,利用耦合搅拌技术后,半连续铸造工艺参数范围扩大,铸造效率得到提高,铸造过程中熔体温度波动由40~50℃减小到l℃,液穴深度由128 mm减小到88mm,铸锭平均晶粒大小减小13%,且偏差由30%减小到9%,成分偏析也明显减小.此外,合金流变应力减小,且铸锭不同部位的流变应力大小差异也明显减小.耦合搅拌技术显著地改善熔体和铸锭的均匀性.
参考文献
[1] | 朱庆丰;李磊;班春燕;赵志浩;左玉波;崔建忠.高纯铝室温多向锻造过程中变形组织均匀性及晶粒细化极限[J].中国有色金属学报(英文版),2014(5):1301-1306. |
[2] | 朱益藩,计波,闵新华,吴英彦,朱峰.钛合金大型铸锭成分均匀性研究[C].稀有金属材料与工程(第十二届全国钛及钛合金学术交流会:论文专辑),2005:208-210. |
[3] | 贺永东;张新明;曹志强.微量Cr、Mn、Zr、Ti、B元素对铸态AlZnMgCu合金的晶粒细化效果的影响[J].稀有金属材料与工程,2010(7):1135-1140. |
[4] | C. Mapelli;A. Gruttadauria;M. Peroni.Application of electromagnetic stirring for the homogenization of aluminium billet cast in a semi-continuous machine[J].Journal of Materials Processing Technology,20102(2):306-314. |
[5] | 陈兴润;张志峰;徐骏;石力开.电磁搅拌法制备半固态浆料过程电磁场、流场和温度场的数值模拟[J].中国有色金属学报,2010(5):937-945. |
[6] | 左玉波;崔建忠;赵志浩;朱庆丰.低频电磁铸造7050铝合金的组织与性能[J].东北大学学报(自然科学版),2008(1):77-80. |
[7] | 汤孟欧;徐骏;张志峰;白月龙.环缝结构对电磁连铸流场和温度场的影响[J].中国有色金属学报(英文版),2011(5):1123-1129. |
[8] | Guanglei ZHU;Jun XU;Zhifeng ZHANG;Yuelong BAI;Likai SHI.Annular electromagnetic stirring-a new method for the production of semi-solid A357 aluminum alloy slurry[J].金属学报(英文版),2009(6):408-414. |
[9] | Jun Xu;Haijun Wang;Mengou Tang.Application Research on DC Casting Process by Annular Electromagnetic Stirring for a Modified 7075 Alloy[J].Materials Science Forum,2013:175-179. |
[10] | Haijun Wang;Ju Xu;Yonglin Kang.Study on inhomogeneous characteristics and optimize homogenization treatment parameter for large size DC ingots of Al-Zn-Mg-Cu alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2014:19-24. |
[11] | D'Elia, F.;Ravindran, C.;Sediako, D..Interplay among solidification, microstructure, residual strain and hot tearing in B206 aluminum alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2015:169-180. |
[12] | Yubo Zuo;Jianzhong Cui;Jie Dong.Effect of low frequency electromagnetic field on the constituents of a new super high strength aluminum alloy[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,20051/2(1/2):149-155. |
[13] | 张勤;崔建忠;路贵民;张北江.磁场强度对半连铸铝合金液穴形状及凝固组织的影响[J].金属学报,2002(9):956-960. |
[14] | 张勤;崔建忠.7075铝合金CREM法半连铸坯中溶质元素的宏观分布[J].金属学报,2003(12):1264-1268. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%