caa a22 4500 463233638 CHVBK 20180405153249.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s10853-006-0388-x doi (NATIONALLICENCE)springer-10.1007/s10853-006-0388-x The effect of varying chill surface roughness on interfacial heat transfer during casting solidification [Elektronische Daten] [William Griffiths, Ramazan Kayikci] 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-4.5wt.% 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. Springer Science+Business Media, LLC, 2007 Griffiths William Department of Metallurgy and Materials Science, School of Engineering, University of Birmingham, B15 2TT, Edgbaston, Birmingham, UK aut Kayikci Ramazan Technical Education Faculty, Department of Materials Technology, Sakarya University, 54090, Esentepe, Adapazari, Turkey aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/11(2007-06-01), 4036-4043 0022-2461 42:11<4036 2007 42 10853 https://doi.org/10.1007/s10853-006-0388-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0388-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Griffiths William Department of Metallurgy and Materials Science, School of Engineering, University of Birmingham, B15 2TT, Edgbaston, Birmingham, UK aut NATIONALLICENCE 700 1- Kayikci Ramazan Technical Education Faculty, Department of Materials Technology, Sakarya University, 54090, Esentepe, Adapazari, Turkey aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/11(2007-06-01), 4036-4043 0022-2461 42:11<4036 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer