The evolution of ultrafine ferrite formation through dynamic strain-induced transformation

Beladi, Hossein, Kelly, Georgina, Shokouhi, A. and Hodgson, Peter 2004, The evolution of ultrafine ferrite formation through dynamic strain-induced transformation, Materials science & engineering. A., Structural materials : properties, microstructure and processing, vol. 371, no. 1, pp. 343-352, doi: 10.1016/j.msea.2003.12.024.

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Title The evolution of ultrafine ferrite formation through dynamic strain-induced transformation
Author(s) Beladi, HosseinORCID iD for 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 371
Issue number 1
Start page 343
End page 352
Publisher Elsevier Sequoia
Place of publication Lausanne, Switzerland
Publication date 2004-04
ISSN 0921-5093
1873-4936
Keyword(s) ultrafine ferrite
dynamic strain-induced transformation
austenite grain size
coarsening
hot torsion
Summary Hot torsion testing of a C–Mn–V steel was used to study the evolution of  ultrafine ferrite (UFF) formation by dynamic strain-induced transformation (DSIT) in conjunction with air-cooling for two prior austenite grain sizes. This study evaluated not only the evolution of DSIT ferrite during straining, but also the grain growth behaviour of DSIT ferrite grains during post-deformation cooling. For both austenite grain sizes, the DSIT ferrite initially nucleated on/or near prior austenite grain boundaries at an early stage of transformation followed by the grain interiors. 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 (GB) and the intragranular ferrite (IG) grains during post-deformation cooling. For the fine prior austenite grain size, the distribution of DSIT ferrite grains was more homogenous compared with the coarse austenite and the coarsening occurred not only in the GB ferrite grains but also in the IG ferrite grains. However, the ferrite coarsening mostly occurred for the IG ferrite rather than the GB ferrite grains in the coarse austenite. The result suggests that normal grain growth occurred during the overall transformation in the GB ferrite grains for the coarse initial austenite grain size.
Notes Available online 21 March 2004.
Language eng
DOI 10.1016/j.msea.2003.12.024
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 ©2004, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30002831

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