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Grain Size Prediction in AA6060 Profile Extrusion

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Grain Size Prediction in AA6060 Profile Extrusion

Lorenzo Donati and Luca Tomesani, University of Bologna, Bologna, Italy
Marco Schikorra and A. Erman Tekkaya, Technische Universität Dortmund, Dortmund, Germany

Track: EXTRUSION/DIE, THEORETICAL - Microstructure

ABSTRACT --- In the first part of the work, an experimental procedure to
investigate the evolution of recrystallization in aluminum alloys is presented and
discussed. Several cups, obtained by means of inverse extrusion, were produced
at different temperatures and process speeds. The specimens were analyzed in
order to examine the grain size distribution. The coefficients for dynamic
recrystallization models were obtained by regression analysis after thermomechanical
Finite Element Method (FEM) simulations of the experiments were
realized with the code Deform 3-D. The specimens were then heated in a furnace
and cooled, in order to reproduce static recrystallization of the material. The
grain distribution was examined, and the coefficients for the equation for static
recrystallization prediction were regressed too. In the second part of the work,
the extrusion of a round-shaped profile is described, and the grain size
distribution on the profile and on the billet rest is analyzed. The developed
equations were applied to the rod extrusion, and the simulated grain size
distributions were compared with the experimental ones.

© Extrusion Technology for Aluminum Profiles Foundation (ET Foundation). All rights reserved. No part of The Proceedings may be reproduced in any form without the express written permission of the ET Foundation.