Microstructure Investigation of Using Slope Plate Casting Hypereutectic Al-Si Alloy

Ezat, Nawal; Ibrahim, Osama

doi:10.30684/etj.31.3A.2

	Microstructure Investigation of Using Slope Plate Casting Hypereutectic Al-Si Alloy
Engineering and Technology Journal
Article 1, Volume 31, 3A, 2013, Pages 400-415 PDF (860.64 K)
DOI: 10.30684/etj.31.3A.2
Authors
Nawal Ezat; Osama Ibrahim
Abstract
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.
Keywords
Slope platecasting; Hypereutectic Al; Si alloy; Reheating

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