中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 31 No. 3 March 2021 |
（1. Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004, China;
2. College of Materials Science and Engineering, Northeastern University, Shenyang 110004, China;
3. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, China）
Abstract:The ingot was prepared by direct-chill (DC) casting technology with different casting speeds under the influence of intensive melt shearing to explore the effect of casting speed and intensive melt shearing on the floating grains and negative centerline segregation. The results indicate that the application of intensive melt shearing in DC casting process can distribute the floating grains uniformly, reduce the area fraction of the floating grains, alleviate the negative centerline segregation, and improve the uniformity of temperature field in the sump. It is also suggested that under the influence of intensive melt shearing, the casting speed plays a crucial role in the amounts and distribution of floating grains. At low casting speed, the intensive melt shearing can significantly reduce the area fraction of the floating grains and distribute them uniformly throughout the ingot. However, this effect gradually disappears with the increase of casting speed.
Key words: direct-chill casting; intensive melt shearing; macrosegregation; floating grains; casting speed; 2024 aluminum alloy
