Numerical study of aluminum segregation during electron beam cold hearth remelting for large-scale Ti-6 wt%Al-4 wt%V alloy round ingot
| Autor: | Yehua Jiang, Lei Gao, Hong-ming Zhang, Yudong Sui, Rong Zhou, Xiang-ming Li, Haiguang Huang, Zhe Shi, Kinnor Chattopadhyay |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Mechanical Engineering Alloy Mixing (process engineering) chemistry.chemical_element 02 engineering and technology Péclet number engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Casting 010305 fluids & plasmas symbols.namesake chemistry Aluminium 0103 physical sciences engineering symbols Composite material Ingot 0210 nano-technology Intensity (heat transfer) Dimensionless quantity |
| Zdroj: | International Journal of Heat and Mass Transfer. 139:764-772 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2019.05.052 |
| Popis: | To investigate aluminum (Al) segregation in industrial-scale Ti-6 wt%Al-4 wt%V (TC4) round ingots produced by electron beam cold hearth remelting (EBCHR), a three-dimensional multiphysics model verified with experimental data in the literature has been established. The numerical predictions qualitatively reveal that the Al concentration distribution in the pool is highly related to the flow pattern. A promising method to restrain Al segregation is to enhance mixing during EBCHR by increasing the casting speed. A series of numerical cases reveal the relation between the casting speed, the dimensionless measure of the stirring intensity (Peclet number, Pe ¯ ), and the corresponding segregation degree (Ф) in the pool. The results suggest that for EBCHR at a pouring temperature 2273 K, as the casting speed increases from 10 to 25 mm/min, the Pe ¯ value increases from 418 to 1820, and the corresponding Ф value increases from 0.681 to 0.871. As a consequence, the intensity of aluminum segregation on the solidified cross-section improves (decreases from 2.77 × 10−3 to 1.76 × 10−4). |
| Databáze: | OpenAIRE |
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