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Prediction of Static Recrystalization during Shaped Extrusion

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Prediction of Static Recrystalization during Shaped Extrusion

Zhi Peng, Terry Sheppard

Track: EXTRUSION PROCESS - Peripheral Coarse Grain

ABSTRACT --- Extrusions experience large deformations when they traverse the die land,
leading to considerable modifications to the average deformation parameters when
compared to the remainder of the extrusion. The distribution of structure is therefore
greatly inhomogeneous. Reference to both empirical and physical models of the
recrystalization process indicates that nucleation and growth will differ at these locations
in those alloys that are usually solution treated and aged subsequent to the deformation
process. Since static recrystalization has a significant influence on many of the properties
of the extrudate, it is therefore essential to provide the methodology to predict these
variations. In the work presented, a physical model based on dislocation density, subgrain
size and misorientation is integrated into the commercial FEM codes, FORGE2® and
FORGE3® to study the microstructure changes. Axi-symmetrical and shape extrusion are
presented as examples. The evolution of the substructure influencing static
recrystalization is studied. The metallurgical behaviour of axi-symmetric extrusion and that
of shape extrusion are compared. The predicted results show an agreement with the
experimental measurement. The distribution of equivalent strain, temperature
compensated strain rate and temperatures are also presented to aid in interpretation.

© 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.