A novel research on the solute redistribution phenomenon of sub-rapid twin-roll cast Al-50 wt.% alloy treated by semi-solid heat treatment
In this study, a vertical twin-roll cast (TRC) thermal-fluid coupling model was established to determine a suitable roll-casting velocity. A slab of 0.9 mm thick roll-cast Al-50 wt.% Si alloy with a two-phase zone width of 473 °C was prepared at a velocity of 20 m/min for the first time. In addition...
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| Autores principales: | , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Elsevier
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/63643b9219b34386aefb2428cc195f26 |
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| Sumario: | In this study, a vertical twin-roll cast (TRC) thermal-fluid coupling model was established to determine a suitable roll-casting velocity. A slab of 0.9 mm thick roll-cast Al-50 wt.% Si alloy with a two-phase zone width of 473 °C was prepared at a velocity of 20 m/min for the first time. In addition, the finite element simulation showed that the average heat transfer rate had a positive correlation with the roll-casting velocity. When the roll-casting velocity increased to 20 m/min, the average heat transfer rate reached 1260 K/s, at which point, the average size of the primary Si was merely 16.5 μm. This was a decrease of approximately 90% when compared with the size of alloys cast with conventional methods. After carrying out semi-solid heating, an observation on the distribution of alloy elements identified a novel phenomenon of solute redistribution, i.e., inverse segregation. This inverse segregation process was highly significant in further controlling solute redistribution in the alloy. Additionally, it provided a new concept for improving roll-cast segregation. |
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