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Influence of silicon content on the volume deficit characteristic of cast Al–Si alloys

Published online by Cambridge University Press:  16 December 2013

Samavedam Santhi ,
S.B. Sakri ,
Dharwada Hanumantha Rao  and
Srinivasan Sundarrajan
Samavedam Santhi*
Affiliation:
Department of Metallurgical and Materials Engineering, Mahatma Gandhi Institute of Technology, Hyderabad 500075, India
S.B. Sakri
Affiliation:
Special Fabrication Division, Defence Research and Development Laboratory, Hyderabad 500058, India
Dharwada Hanumantha Rao
Affiliation:
Mechanical Engineering Department, M.V.S.R. Engineering College, Hyderabad 501510, India
Srinivasan Sundarrajan
Affiliation:
National Institute of Technology, Trichy 620015, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Aluminum alloy castings find extensive applications in automobile and other engineering industries. Production of defect-free castings requires a good understanding of the volume deficit characteristic. The volume deficit of a casting depends on the casting material and casting conditions. Patterson and Engler have classified the volume deficit into four types namely, macrocavities, internal porosity, surface sinking, and volumetric contraction. The influence of process parameters on the characteristics determines the casting quality. The process parameters considered in this study are bottom chill, casting shape, and pouring temperature. Two basic shapes rectangle and cylinder are considered. The volume deficit decreases with an increase in the silicon content. The AA 356.0 alloy shows more amount of volume deficit than AA 413.0 alloy. X-ray computer tomography (XCT) helps to reveal the size, shape, and location of defects in castings. Quantification of internal closed porosity of AA 413.0 casting is done using XCT and successfully validated through destructive testing of castings.

Keywords

castingAl–Si alloysvolume deficitsolid modelx-ray computer tomography
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 24 , 28 December 2013 , pp. 3355 - 3366
Copyright
Copyright © Materials Research Society 2013 

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References

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