Effect of thermomechanical parameters on the critical strain for ultrafine ferrite formation through hot torsion testing Beladi, Hossein, Kelly, Georgina, Shokouhi, A. and Hodgson, Peter 2004, Effect of thermomechanical parameters on the critical strain for ultrafine ferrite formation through hot torsion testing, Materials science & engineering. A., Structural materials : properties, microstructure and processing, vol. 367, pp. 152-161, doi: 10.1016/j.msea.2003.09.095. Attached Files Name Description MIMEType Size Downloads Title Effect of thermomechanical parameters on the critical strain for ultrafine ferrite formation through hot torsion testing Author(s) Beladi, Hossein orcid.org/0000-0003-0131-707X Kelly, Georgina Shokouhi, A. Hodgson, Peter Journal name Materials science & engineering. A., Structural materials : properties, microstructure and processing Volume number 367 Start page 152 End page 161 Publisher Elsevier Sequoia Place of publication Lausanne, Switzerland Publication date 2004-02 ISSN 0921-5093 1873-4936 Keyword(s) ultrafine ferrite dynamic strain-induced transformation hot torsion critical strain Summary A C–Mn–V steel was used to study ultrafine ferrite formation (1–3 μm) through dynamic strain-induced transformation (DSIT) using hot torsion experiments. A systematic study determined the critical strain for the start of DSIT (C,DSIT), although this may not lead to a fully ultrafine microstructure. Therefore, the strain to produce an ultrafine ferrite (UFF) as final microstructure (C,UFF) during deformation was also determined. In addition, the effect of thermomechanical parameters such as deformation temperature, prior austenite grain size, strain rate and cooling rate on C,DSIT and C,UFF has been evaluated. DSIT ferrite nucleated on prior austenite grain boundaries at an early stage of straining followed by intragranular nucleation at higher strains. The prior austenite grain size affected the distribution of DSIT ferrite nucleation sites at an early stage of transformation and the subsequent coarsening behaviour of the grain boundary and intragranular ferrite grains during post-deformation cooling. Also, C,DSIT and C,UFF increased with an increase in the prior austenite grain size and deformation temperature. The post-deformation cooling had a strong effect not only on C,UFF but also the UFF microstructure (i.e. final ferrite grain size and second phase characteristics). Notes Available online 27 November 2003. Language eng DOI 10.1016/j.msea.2003.09.095 Field of Research 091207 Metals and Alloy Materials Socio Economic Objective 970109 Expanding Knowledge in Engineering HERDC Research category C1 Refereed article in a scholarly journal Copyright notice ©2003, Elsevier B.V. Persistent URL http://hdl.handle.net/10536/DRO/DU:30002837 Document type: Journal Article Collections: Faculty of Science, Engineering and Built Environment School of Engineering and Technology Related Links Link Description Connect to published version (restricted access) Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Fri, 10 Oct 2008, 12:52:12 EST Fri, 03 Apr 2009, 08:55:02 EST Fri, 08 Nov 2013, 11:49:26 EST Fri, 13 Jun 2014, 22:48:47 EST Fri, 17 Oct 2014, 08:18:42 EST Filtered Full Citation counts:   Cited 68 times in TR Web of Science Cited 74 times in Scopus Search Google Scholar Access Statistics: 997 Abstract Views, 1 File Downloads  -  Detailed Statistics Created: Mon, 07 Jul 2008, 08:35:51 EST

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