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Hot deformation and recrystallization of austenitic stainless steel: part 1. dynamic recrystallization

journal contribution
posted on 2008-06-01, 00:00 authored by A Dehghan-Manshadi, Matthew BarnettMatthew Barnett, Peter HodgsonPeter Hodgson
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.

History

Journal

Metallurgical and materials transactions A - physical metallurgy and materials science

Volume

39

Issue

6

Pagination

1359 - 1370

Publisher

Springer

Location

Boston, Mass.

ISSN

1073-5623

eISSN

1543-1940

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2008, Maney publishing