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The formation of ultrafine ferrite through static transformation in low carbon steels

Adachi, Yoshitaka, Wakita, Masayuki, Beladi, Hossein and Hodgson, Peter 2007, The formation of ultrafine ferrite through static transformation in low carbon steels, Acta Materialia, vol. 55, no. 14, pp. 4925-4934.


Title The formation of ultrafine ferrite through static transformation in low carbon steels
Author(s) Adachi, Yoshitaka
Wakita, Masayuki
Beladi, Hossein
Hodgson, Peter
Journal name Acta Materialia
Volume number 55
Issue number 14
Start page 4925
End page 4934
Publisher Elsevier Science
Place of publication Oxford, England
Publication date 2007-07-03
ISSN 1359-6454
Keyword(s) ultrarefinement
heavy deformation
warm deformation
transformation
microbands
Summary A novel approach was used to produce an ultrafine grain structure in low carbon steels with a wide range of hardenability. This included warm deformation of supercooled austenite followed by reheating in the austenite region and cooling (RHA). The ultrafine ferrite structure was independent of steel composition. However, the mechanism of ferrite refinement hanged with the steel quench hardenability. In a relatively low hardenable steel, the ultrafine structure was produced through dynamic strain-induced transformation, whereas the ferrite refinement was formed by static transformation in steels with high quench hardenability. The use of a model Ni–30Fe austenitic alloy revealed that the deformation temperature has a strong effect on the nature of the intragranular defects. There was a transition temperature below which the cell dislocation structure changed to laminar microbands. It appears that the extreme refinement of ferrite is due to the formation of extensive high angle intragranular defects at these low deformation temperatures that then act as sites for static transformation.
Language eng
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007133

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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Created: Mon, 29 Sep 2008, 08:48:40 EST