Microstructure Investigation of Using Slope Plate Casting Hypereutectic Al-Si Alloy
In this work, the effects of the overheating temperature and tilt angle on the microstructure and hardness of a hypereutectic Al-23%Si alloy were investigated. Al-23%Si melt was overheated to (760, 790, 820 and 850) ºC and poured onto slope plate continuously cooled with water circulation underneath...
| Published in: | Engineering and Technology Journal |
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| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Published: |
Unviversity of Technology- Iraq
2013-03-01
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| Subjects: | |
| Online Access: | https://etj.uotechnology.edu.iq/article_81926_86c6582e4e88afd5db753e7758364c83.pdf |
| Summary: | In this work, the effects of the overheating temperature and tilt angle on the microstructure and hardness of a hypereutectic Al-23%Si alloy were investigated. Al-23%Si melt was overheated to (760, 790, 820 and 850) ºC and poured onto slope plate continuously cooled with water circulation underneath, with various tilt angles (40, 50, 60)º using a constant cooling length (300 mm(. After, the melt became a semi-solid; the slurry was then filled the mould and completely solidified. Slope plate samples were reheated to a semi-solid temperature (550)ºC for (10 min) and then quenched in water. Microstructural images analysis showed that the grain size and the shape factor of (β-Si) phase were decreased with increasing of the overheating temperature and tilt angles, on other hand, the volume fraction of (β-Si) phase was increased. The results of the reheating route showed that the grain size of (β-Si) phase was slightly increased after reheating at all overheating temperatures and tilting angles. On other side, the shape factor was improved, and the volume fraction of (β-Si) phase was decreased, as compared with slope plate results. |
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| ISSN: | 1681-6900 2412-0758 |