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Understanding surface defects on direct chill cast 6xxx aluminium billets
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
2012 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Sundsvall: Mid Sweden University , 2012. , s. 42
Serie
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 76
Nyckelord [en]
Aluminium, billets, DC casting, segregation, surface defects, vertical drags, Bridgman furnace, dewetting, non-wettable, nanocomp, Metcast ST20, graphite ring, titanium-butoxide
Nationell ämneskategori
Materialteknik
Identifikatorer
URN: urn:nbn:se:miun:diva-16175ISBN: 978-91-87103-03-2 (tryckt)OAI: oai:DiVA.org:miun-16175DiVA, id: diva2:524878
Handledare
Tillgänglig från: 2012-05-04 Skapad: 2012-05-04 Senast uppdaterad: 2012-10-31Bibliografiskt granskad
Delarbeten
1. Surface defects on direct chill as-cast 6XXX aluminum billets
Öppna denna publikation i ny flik eller fönster >>Surface defects on direct chill as-cast 6XXX aluminum billets
2011 (Engelska)Ingår i: TMS Light Metals, San Diego, CA: The Minerals, Metals, and Materials Society, 2011, s. 675-680Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Surface defects found during air-slip direct chill casting are today a major quality factor for extruded aluminum, as they can cause increased segregation, pores and unwanted precipitations. The surface zone in billets of the aluminium alloys 6063, 6005 and 6082 have been analysed by metallographic methods and by chemical analysis. Surface defects, of the type vertical drags, were investigated and compared to defect free surfaces. Inverse segregation to the surface was quantitatively analysed. The concentration profiles were coupled to the appearance of the defects and to microstructures from corresponding areas. It was shown, for vertical drags on 6005 billet surfaces, that either the segregation depth or the precipitated particles were different from surface areas without defects. For the 6063 alloys on the other hand the vertical drag zones contained different particles than surfaces without defects and the segregation had noticeably increased.

Ort, förlag, år, upplaga, sidor
San Diego, CA: The Minerals, Metals, and Materials Society, 2011
Serie
TMS Light Metals, ISSN 0147-0809 ; 2011
Nyckelord
Aluminum, DC casting, Segregation, Surface defects, Vertical drags, Aluminium alloys, As-cast, Billet surface, Concentration profiles, Defect-free surfaces, Direct chill casting, Direct chills, Extruded aluminum, Inverse segregation, Metallographic method, Quality factors, Surface area, Surface zones, Aluminum alloys, Billets (metal bars), Chemical analysis, Crystallography, Drag, Segregation (metallography), Surface segregation
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:miun:diva-14211 (URN)000324515400117 ()2-s2.0-79955166745 (Scopus ID)978-111802935-0 (ISBN)
Konferens
Light Metals 2011 - TMS 2011 Annual Meeting and Exhibition; San Diego, CA; 27 February 2011 through 3 March 2011; Code 84639
Tillgänglig från: 2011-07-19 Skapad: 2011-07-19 Senast uppdaterad: 2014-11-03Bibliografiskt granskad
2. Simulation of surface solidification in direct-chill 6xxx aluminum billets
Öppna denna publikation i ny flik eller fönster >>Simulation of surface solidification in direct-chill 6xxx aluminum billets
2012 (Engelska)Ingår i: IOP Conference Series: Materials Science and Engineering, Institute of Physics (IOP), 2012, s. Art. no. 012013-Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
Institute of Physics (IOP), 2012
Serie
IOP Conference Series : Materials Science and Engineering, ISSN 1757-8981 ; Vol. 27
Nyckelord
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
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:miun:diva-16173 (URN)10.1088/1757-899X/27/1/012013 (DOI)000301192900013 ()2-s2.0-84858202591 (Scopus ID)
Konferens
3rd International Conference on Advances in Solidification Processes, ICASP-3;Aachen;7 June 2011through10 June 2011;Code88954
Tillgänglig från: 2012-05-04 Skapad: 2012-05-04 Senast uppdaterad: 2015-06-30Bibliografiskt granskad
3. Modification of mould surfaces for direct chill casting by application of nanostructures
Öppna denna publikation i ny flik eller fönster >>Modification of mould surfaces for direct chill casting by application of nanostructures
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:miun:diva-16174 (URN)
Tillgänglig från: 2012-05-04 Skapad: 2012-05-04 Senast uppdaterad: 2012-07-27Bibliografiskt granskad

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