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Effect of Initial Grain Size on the Dynamic Recrystallization Behaviours of Austenite

Journal Materials Science Forum (Volumes 561 - 565)
Volume PRICM 6
Edited by Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages 33-36
DOI 10.4028/www.scientific.net/MSF.561-565.33
Citation A. Dehghan-Manshadi et al., 2007, Materials Science Forum, 561-565, 33
Online since October, 2007
Authors A. Dehghan-Manshadi, Peter Damien Hodgson
Keywords Dynamic Recrystallization (DRX), Electron Backscatter Diffraction (EBSD), Hot Deformation, Initial Grain Size, Stainless Steel (SS)
Abstract

The effect of initial grain size on the recrystallization behaviour of a type 304 austenitic stainless steel was investigated using hot torsion. Refinement of the initial grain size to 8 μm had a considerable effect on the flow curve shapes, peak and critical strains and also on DRX kinetics, compared with an initial grain size of 35 μm. Microstructural investigations using EBSD suggest a transition from conventional (discontinuous) to continuous dynamic recrystallization with decreasing initial grain size. Also, there was a moderate effect of initial grain size on the DRX grain size.

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