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Open AccessArticle

A Continuum Model for the Effect of Dynamic Recrystallization on the Stress–Strain Response

1
Philips HealthTech, Amstelplein 2, 1096 BC Amsterdam, The Netherlands
2
Department of Nonlinear Solid Mechanics, University of Twente, Drienerlolaan 5, 7522 NB Enschede, The Netherlands
*
Author to whom correspondence should be addressed.
Materials 2018, 11(5), 867; https://doi.org/10.3390/ma11050867
Received: 3 May 2018 / Revised: 18 May 2018 / Accepted: 18 May 2018 / Published: 22 May 2018
(This article belongs to the Special Issue Dynamic Recrystallization and Microstructural Evolution in Alloys)
Austenitic Stainless Steels and High-Strength Low-Alloy (HSLA) steels show significant dynamic recovery and dynamic recrystallization (DRX) during hot forming. In order to design optimal and safe hot-formed products, a good understanding and constitutive description of the material behavior is vital. A new continuum model is presented and validated on a wide range of deformation conditions including high strain rate deformation. The model is presented in rate form to allow for the prediction of material behavior in transient process conditions. The proposed model is capable of accurately describing the stress–strain behavior of AISI 316LN in hot forming conditions, also the high strain rate DRX-induced softening observed during hot torsion of HSLA is accurately predicted. It is shown that the increase in recrystallization rate at high strain rates observed in experiments can be captured by including the elastic energy due to the dynamic stress in the driving pressure for recrystallization. Furthermore, the predicted resulting grain sizes follow the power-law dependence with steady state stress that is often reported in literature and the evolution during hot deformation shows the expected trend. View Full-Text
Keywords: dynamic recrystallization; hot forming; austenitic stainless steel; high-strength low-alloy; strain rate; driving pressure; continuum modeling; dynamic stress dynamic recrystallization; hot forming; austenitic stainless steel; high-strength low-alloy; strain rate; driving pressure; continuum modeling; dynamic stress
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MDPI and ACS Style

Kooiker, H.; Perdahcıoğlu, E.S.; Van den Boogaard, A.H. A Continuum Model for the Effect of Dynamic Recrystallization on the Stress–Strain Response. Materials 2018, 11, 867.

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