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A comprehensive method to identify the kinetics of static recrystallization using the hot torsion test results with an inverse solution

Version 2 2024-06-03, 10:59
Version 1 2015-03-24, 12:47
journal contribution
posted on 2024-06-03, 10:59 authored by S Khoddam, Peter HodgsonPeter Hodgson
Many difficulties exist in directly following the static recrystallization of metals, particularly during hotworking. Indirect measurement of static recrystallization has been extensively performed in the literature where, for example, the recrystallization behavior of austenite in steels has commonly been measured indirectly using the fractional softening method. This method relies on the yield stress changes during recrystallization which are physically simulated by hot torsion or compression tests. However, the inherent heterogeneity of deformation during a mechanical test leads to a non-uniform static recrystallization distribution in the test sample. This, in turn, poses a serious question concerning the reliability of the measurement since the stress calculation techniques during recrystallization are not adequately developed in the existing literature. This paper develops a computer-based method to account for heterogeneous deformation during fractional softening measurements based on the hot torsion test data. The importance of the fractional softening gradient in determining the kinetics is emphasized and deficiencies in our understanding of the basic mechanisms are highlighted. A computer-based method is introduced to generate the experimental and computational components in a cost function. The cost function is then utilized by an inverse solution to calibrate the design parameters in a static recrystallization model.

History

Journal

Modelling and simulation in materials science and engineering

Volume

22

Article number

085010

Pagination

1-1

Location

Bristol, Eng.

ISSN

0965-0393

eISSN

1361-651X

Language

eng

Publication classification

C1 Refereed article in a scholarly journal, C Journal article

Copyright notice

2014, Institute of Physics Publishing

Issue

8

Publisher

Institute of Physics Publishing