Cover
Vol. 8 No. 1 (2008)

Published: June 30, 2008

Pages: 77-89

Original Article

Numerical and Experimental Estimation or Shrinkage Cavities During Al-Alloys Casting

Adnan S. Jabur 1 Farhad M. Kushnaw 2 Imad A. Hussain 3
1 Engineering College University of Basrah
2 Materials Eng. Department University of Technology
3 Materials Department University of Baghdad
History
  • Received: March 30, 2008
  • Available Online: June 30, 2008
DOI

https://doi.org/10.33971/bjes.8.1.7

Abstract

The aim of this research is to predict the shrinkage defects in Al-Si castings by determination the suitable parameters and techniques which can be applied in casting simulation system. Also, it aims to specify the role of silicon content in amount, morphology, and distribution of these defects. The Numerical solution has been carried out using an explicit 3-D finite difference method for the given system of the casting and a mold. Additionally, an experimental casting of the studied samples was achieved. It was found that the shrinkage porosities increased with increasing the silicon content up to 7%, so at this peak, they spread in alt cast regions and cannot be predicted. The low silicon alloys suffered from only the shrinkage cavities defects that can be predicted by mapping the solidus time contours. Finally, it was concluded that the critical temperature gradient value of the porosities development in the eutectic (AI-12%Si) alloys was 1.3°C/cm.

Keywords

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