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Journal of Materials Science

, Volume 42, Issue 11, pp 4036–4043 | Cite as

The effect of varying chill surface roughness on interfacial heat transfer during casting solidification

  • William David Griffiths
  • Ramazan Kayikci
Article

Abstract

Experiments to investigate interfacial heat transfer mechanisms during casting solidification were carried out by varying the surface roughness of a Cu chill used to bring about unidirectional solidification of an Al-4.5 wt.% Cu alloy. Little variation in interfacial heat transfer coefficient with varying chill surface roughness was found, confirming previously published results. Examination of the as-cast surface of the casting showed the presence of predendritic contact areas, and also that the casting surface roughness did not form as a replica of the chill surface, as has often been proposed. Rather, the casting surface roughness was consistently greater than that of the chill, but varied little in the experiments. A sum surface roughness parameter was devised to characterise the casting–chill interface that included the roughness of both surfaces. The value of this parameter was strongly influenced by the greater roughness of the casting surface, rather than the chill surface roughness, and therefore also varied little in the experiments. This lack of variation in the casting surface roughness and hence the sum surface roughness parameter showed how interfacial heat transfer should be more strongly influenced by the greater roughness of the casting surface than of the chill surface, and explains why the interfacial heat transfer coefficient was not strongly influenced by the chill surface roughness in these types of experiments.

Keywords

Surface Roughness Heat Transfer Coefficient Casting Surface Interfacial Heat Transfer Interfacial Heat Transfer Coefficient 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors gratefully acknowledge Federal-Mogul Corporation (WDG) and Sakarya University, Turkey (RK) for financial support of a Senior Research Fellowship and a Research Studentship respectively.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Department of Metallurgy and Materials Science, School of EngineeringUniversity of BirminghamEdgbaston, BirminghamUK
  2. 2.Technical Education Faculty, Department of Materials TechnologySakarya UniversityEsentepe, AdapazariTurkey

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