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Hot Deformation and Recrystallization of Austenitic Stainless Steel: Part I. Dynamic Recrystallization

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Abstract

The hot deformation behavior of a 304 austenitic stainless steel was investigated to characterize the evolution of the dynamically recrystallized structure as a starting point for studies of the postdeformation recrystallization behavior. The effect of different deformation parameters such as strain, strain rate, and temperature were investigated. The flow curves showed typical signs of dynamic recrystallization (DRX) over a wide range of temperatures and strain rates (i.e., different Zener–Hollomon (Z) values). However, under very high or very low Z values, the flow curves’ shapes changed toward those of the dynamic recovery and multiple peaks, respectively. The results showed that while DRX starts at a strain as low as 60 pct of the peak strain, a fully DRX microstructure needs a high strain of almost 4.5 times the initiation strain. The DRX average grain size showed power-law functions with both the Zener–Hollomon parameter and the peak stress, although power-law breakdown was observed at high Z values.

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AcknowledgmentS

Part of this work was supported by the Australian Research Council (ARC) through a Discovery grant. One of the authors (PDH) also acknowledges the support of an ARC funding through the award of a Federation fellowship.

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  1. A. Dehghan-Manshadi

    Present address: Faculty of Engineering, University of Wollongong, Wollongong, NSW, Australia

Authors and Affiliations

  1. Centre for Materials and Fibre Innovation, Deakin University, Geelong, VIC, Australia

    A. Dehghan-Manshadi, M.R. Barnett & P.D. Hodgson

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  1. A. Dehghan-Manshadi
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  2. M.R. Barnett
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  3. P.D. Hodgson
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Correspondence to A. Dehghan-Manshadi.

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Manuscript submitted November 29, 2007.

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Dehghan-Manshadi, A., Barnett, M. & Hodgson, P. Hot Deformation and Recrystallization of Austenitic Stainless Steel: Part I. Dynamic Recrystallization. Metall Mater Trans A 39, 1359–1370 (2008). https://doi.org/10.1007/s11661-008-9512-7

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