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Materials 2017, 10(11), 1259;

Development of a Model for Dynamic Recrystallization Consistent with the Second Derivative Criterion

Chair of Mechanical Design and Manufacturing, Brandenburg University of Technology Cottbus-Senftenberg, Konrad-Wachsmann-Allee 17, D-03046 Cottbus, Germany
Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, D-40237 Düsseldorf, Germany
Author to whom correspondence should be addressed.
Received: 4 October 2017 / Revised: 26 October 2017 / Accepted: 27 October 2017 / Published: 2 November 2017
(This article belongs to the Special Issue Dynamic Recrystallization and Microstructural Evolution in Alloys)
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Dynamic recrystallization (DRX) processes are widely used in industrial hot working operations, not only to keep the forming forces low but also to control the microstructure and final properties of the workpiece. According to the second derivative criterion (SDC) by Poliak and Jonas, the onset of DRX can be detected from an inflection point in the strain-hardening rate as a function of flow stress. Various models are available that can predict the evolution of flow stress from incipient plastic flow up to steady-state deformation in the presence of DRX. Some of these models have been implemented into finite element codes and are widely used for the design of metal forming processes, but their consistency with the SDC has not been investigated. This work identifies three sources of inconsistencies that models for DRX may exhibit. For a consistent modeling of the DRX kinetics, a new strain-hardening model for the hardening stages III to IV is proposed and combined with consistent recrystallization kinetics. The model is devised in the Kocks-Mecking space based on characteristic transition in the strain-hardening rate. A linear variation of the transition and inflection points is observed for alloy 800H at all tested temperatures and strain rates. The comparison of experimental and model results shows that the model is able to follow the course of the strain-hardening rate very precisely, such that highly accurate flow stress predictions are obtained. View Full-Text
Keywords: dynamic recovery; recrystallization; second derivative criterion; alloy 800H dynamic recovery; recrystallization; second derivative criterion; alloy 800H

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Imran, M.; Kühbach, M.; Roters, F.; Bambach, M. Development of a Model for Dynamic Recrystallization Consistent with the Second Derivative Criterion. Materials 2017, 10, 1259.

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