电磁连铸2219铝合金铸锭组织特性及均匀化研究  

Microstructure Characteristics and Homogenization of 2219 Aluminum Alloy Ingot by Electromagnetic Continuous Casting

作　　者：杨春峰 周秉文[1,2] 孟令刚 亚斌[1,2] 徐大召 姜明希[1] 张兴国 Yang Chunfeng;Zhou Bingwen;Meng Linggang;Ya Bin;Xu Dazhao;Jiang Mingxi;Zhang Xingguo(School of Materials Science and Engineering,Dalian University of Technology;Ningbo Institute of Dalian University of Technology)

机构地区：[1]大连理工大学材料科学与工程学院 [2]大连理工大学宁波研究院

出　　处：《特种铸造及有色合金》2023年第12期1658-1663,共6页Special Casting & Nonferrous Alloys

基　　金：国家重点研发计划资助项目(2018YFA0702900);国家自然科学基金资助项目(51971049)。

摘　　要：在半连续铸造过程中施加中频磁场制备了φ180 mm的2219铝合金铸锭,研究电磁场对铸锭微观组织的影响,以及不同均匀化处理制度下微观组织的变化。结果表明,电磁场引起的电磁搅拌作用能明显细化晶粒,促进晶间第二相呈断续粒状分布,有效抑制枝晶偏析;均匀化处理后,第二相回溶更加充分,颗粒更加细小均匀,扩大了均匀化窗口。确定电磁连铸2219铝合金较合理的均匀化制度为530℃×8 h。2219 aluminum alloy ingot with diameter of φ180 mm was successfully prepared by applying medium frequency magnetic field during semi continuous casting process,and the influence of electromagnetic field on microstructure of ingot as well as microstructure evolution under different homogenization treatment systems were investigated.The results indicate that electromagnetic stirring induced by electromagnetic field can obviously refine grains,which promotes the intermittent granular distribution of the intergranular second phase and effectively inhibits dendrite segregation.The homogenization treatment of electromagnetic casting ingot leads to sufficient remelting of the second phase with fine and uniform grains,expanding the homogenization window.Therefore,the reasonable homogenization system of 2219 aluminum alloy by electromagnetic continuous casting was determined as 530℃×8 h.

关 键 词：2219铝合金 电磁连铸 第二相细化 均匀化 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG249.7[金属学及工艺—金属材料]