Influence of hot deformation on mechanical properties and microstructure of a twin-roll cast aluminium alloy en AW-6082

verfasst von

O. Grydin, M. Stolbchenko, F. Nürnberger, M. Schaper

Abstract

Thin strips of medium- and high-strength age-hardening aluminium alloys are widely used in the automotive industry. Reducing their production costs caused by high energy consumption is an actual challenge. The implementation of the twin-roll casting technology is promising. However, mechanical properties of directly cast high-alloyed thin aluminium strips are oftentimes inadequate to standard specifications. In this work, the influence of a hot deformation following a twin-roll cast strip process on the mechanical properties and microstructure is investigated. For this study strips of age-hardening aluminium alloy EN AW-6082 - manufactured at a laboratory scaled twin-roll caster - were single-pass rolled at temperatures of 420 C and true strains of up to 0.5. The mechanical properties of the as-cast and by different strains hot deformed material in the soft-annealed and age-hardened states were characterized by tensile tests. The results reveal that the twin-roll cast material features the necessary strength properties, though it does not meet the standard requirements for ductility. Furthermore, the required minimum strain during hot rolling that is necessary to ascertain the standard specifications has been determined. Based on micrographs, the uniformity of the mechanical properties and of the microstructure as a result of recrystallization due to hot metal forming and heat treatment were determined. A fine-grain microstructure and satisfactory material ductility after prior rolling with a true strain above 0.41 for the age-hardened state T6 and above 0.1 for the soft-annealed state O have been established.

Organisationseinheit(en)

Institut für Werkstoffkunde

Externe Organisation(en)

National Metallurgical Academy of Ukraine
Universität Paderborn

Typ

Artikel

Journal

Journal of Materials Engineering and Performance

Band

23

Seiten

937-943

Anzahl der Seiten

7

ISSN

1059-9495

Publikationsdatum

01.03.2014

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeine Materialwissenschaften, Werkstoffmechanik, Maschinenbau

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1007/s11665-013-0816-4 (Zugang: Geschlossen)