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Simulation of surface solidification in direct-chill 6xxx aluminum billets
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.ORCID iD: 0000-0002-3622-4247
2012 (English)In: IOP Conference Series: Materials Science and Engineering, Institute of Physics (IOP), 2012, Art. no. 012013- p.Conference paper, Published paper (Refereed)
Abstract [en]

Using the Bridgman technique, the solidification of aluminum alloys of types 6005, 6063, and 6082, was studied. The solidification process differs both between the alloys and between billet surface and bulk, due to higher concentrations of Fe, Si, Mn and Mg near the surface. Previously determined surface concentrations were used to calculate the Fe, Si, Mn and Mg additions needed for Bridgman experiments that simulate surface region solidification. Microstructures were studied and grain size, secondary dendrite arm spacing, intermetallic particles, segregation, and coarsening were evaluated. The increased alloy element concentrations at the surface were found to influence both the structure coarseness and the kind of intermetallic precipitation. In addition, clear differences could be determined between the alloy types, depending on their pull rate in the furnace.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2012. Art. no. 012013- p.
Series
IOP Conference Series : Materials Science and Engineering, ISSN 1757-8981 ; Vol. 27
Keyword [en]
Alloy element; Billet surface; Bridgman experiments; Bridgman techniques; Grain size; Inter-metallic particle; Secondary dendrite arm spacing; Solidification process; Structure coarseness; Surface concentration; Surface region
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:miun:diva-16173DOI: 10.1088/1757-899X/27/1/012013ISI: 000301192900013Scopus ID: 2-s2.0-84858202591OAI: oai:DiVA.org:miun-16173DiVA: diva2:524872
Conference
3rd International Conference on Advances in Solidification Processes, ICASP-3;Aachen;7 June 2011through10 June 2011;Code88954
Available from: 2012-05-04 Created: 2012-05-04 Last updated: 2015-06-30Bibliographically approved
In thesis
1. Understanding surface defects on direct chill cast 6xxx aluminium billets
Open this publication in new window or tab >>Understanding surface defects on direct chill cast 6xxx aluminium billets
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2012. 42 p.
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 76
Keyword
Aluminium, billets, DC casting, segregation, surface defects, vertical drags, Bridgman furnace, dewetting, non-wettable, nanocomp, Metcast ST20, graphite ring, titanium-butoxide
National Category
Materials Engineering
Identifiers
urn:nbn:se:miun:diva-16175 (URN)978-91-87103-03-2 (ISBN)
Supervisors
Available from: 2012-05-04 Created: 2012-05-04 Last updated: 2012-10-31Bibliographically approved

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Erdegren, MikaelUllah, Mohammad WaliCarlberg, Torbjörn
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CiteExportLink to record
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