Abstract
Abstract: A mixed three-phase solidification model based on the Eulerian-Eulerian approach and the volume average method for macrosegregation were applied to predict the segregation in Al-4Cu alloy ingot during direct chill casting (DC). In addition to the thermosolutal buoyancy flow, we considered the movement of equiaxed crystals, the capture of equiaxed crystals by growing columnar crystals and the interaction and impingement between columnar and equiaxed crystals in the model. The results show that a conical zone of negative segregation is obviously observed at the bottom of the ingot. Negative segregation is also observed adjacent to the center, whereas positive segregation is obtained in the center and middle of the radius. This W-type segregation profile is in agreement with the measured experimental data obtained from literatures. At the same time, the influence of pouring temperature and casting speed on macrosegregation were also studied. It indicates that casting speed has a greater effect on segregation than the pouring temperature.
| Translated title of the contribution | Numerical Simulation for Macrosegregation of Al-4Cu Alloy Ingot During Direct Chill Casting Based on Three-Phase Model |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 3030-3037 |
| Number of pages | 8 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 47 |
| Issue number | 10 |
| State | Published - 1 Oct 2018 |