Recrystallization in 304 Austenitic Stainless Steel
2004; Trans Tech Publications; Volume: 467-470; Linguagem: Inglês
10.4028/www.scientific.net/msf.467-470.1163
ISSN1662-9760
AutoresAli Dehghan‐Manshadi, Hossein Beladi, Matthew Barnett, Peter Hodgson,
Tópico(s)Microstructure and mechanical properties
ResumoA 304 austenitic stainless steel was deformed using hot torsion to study the evolution of dynamic recrystallization (DRX). The initial nucleation of dynamically recrystallization occurred by the bulging of pre-existing high angle grain boundaries at a strain much lower than the peak strain. At the peak stress, only a low fraction of the prior grain boundaries were covered with new DRX grains. Beyond the peak stress, new DRX grains formed layers near the initial DRX and a necklace structure was developed. Several different mechanisms appeared to be operative in the formation of new high angle boundaries and grains. The recrystallization behaviour after deformation showed a classic transition from strain dependent to strain independent softening. This occurred at a strain beyond the peak, where the fraction of dynamic recrystallization was only 50%.
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