Taguchi Approach for Optimization of Parameters that Effect Grain Size of Cast A357 Alloy

Grain refining and modification are common foundry practice for improving properties of cast Al-Si alloys. In general, these types of treatments provide better fluidity, decreased porosity, higher yield strength and ductility. However, in practice, there are still some discrepancies on the reproduci...

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Bibliographic Details
Published in:Archives of foundry engineering 2017-12, Vol.17 (4), p.35-42
Main Authors: Çolak, M., Dışpınar, D.
Format: Article
Language:English
Subjects:
A357
Grain refinement
Modification
Optimization
Taguchi
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Summary:Grain refining and modification are common foundry practice for improving properties of cast Al-Si alloys. In general, these types of treatments provide better fluidity, decreased porosity, higher yield strength and ductility. However, in practice, there are still some discrepancies on the reproducibility of the results from grain refining and effect of the refiner’s additions. Several factors include the fading effect of grain refinement and modifiers, inhomogeneous dendritic structure and non-uniform eutectic modification. In this study, standard ALCAN test was used by considering Taguchi’s experimental design techniques to evaluate grain refinement and modification efficiency. The effects of five casting parameters on the grain size have been investigated for A357 casting alloy. The results showed that the addition of the grain refiner was the most effective factor on the grain size. It was found that holding time, casting temperature, alloy type and modification with Sr were less effective over grain refinement.
ISSN:2299-2944
2299-2944
DOI:10.1515/afe-2017-0127