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On vertical drag defects formation during direct chill (DC) casting of aluminum billets
Mid Sweden University, Sundsvall, Sweden.
Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
2014 (engelsk)Inngår i: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 45, nr 1, s. 175-181Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

During air-slip direct chill casting of aluminum billets, one of the major defects occurring includes traces along the billet called vertical drags (VDs). If the VDs are too deep or too many, then they cause scraping of the billets. As in the subsequent extrusion process, the surface quality is known to impair both the productivity and quality of the profiles. In cast-house practice, many theories circulate about the causes of VD defects and how to avoid them, but in the literature, no thorough treatments have been made to explain this phenomenon. In the current study, the outer appearance, structure around, and compositions at the defects are analyzed. A theory for the formation of the defects, their cause, and how their appearance is coupled to different alloy types is presented. The segregation in the vicinity of the defects is discussed based on deformation of semisolid materials and coupled to Reynolds dilatancy ingranular materials. The theory can explain differences between 6063 and 6005 alloys.

sted, utgiver, år, opplag, sider
2014. Vol. 45, nr 1, s. 175-181
Emneord [en]
aluminium, DC-casting, vertical drag, Reynolds dilatancy
HSV kategori
Identifikatorer
URN: urn:nbn:se:hj:diva-22897DOI: 10.1007/s11663-013-0009-4ISI: 000330735200022Scopus ID: 2-s2.0-84893236161OAI: oai:DiVA.org:hj-22897DiVA, id: diva2:682323
Tilgjengelig fra: 2013-12-27 Laget: 2013-12-27 Sist oppdatert: 2017-12-06bibliografisk kontrollert

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