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

Adachi, Y., Wakita, M., Beladi, H. and Hodgson, P. D. 2008, The formation of ultrafine ferrite through static transformation in low carbon steels, International journal of modern physics B, vol. 22, no. 18-19, pp. 2804-2813.

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Title The formation of ultrafine ferrite through static transformation in low carbon steels
Author(s) Adachi, Y.
Wakita, M.
Beladi, H.
Hodgson, P. D.
Journal name International journal of modern physics B
Volume number 22
Issue number 18-19
Start page 2804
End page 2813
Total pages 10
Publisher World Scientific Publishing
Place of publication Singapore
Publication date 2008
ISSN 0217-9792
Keyword(s) Science & Technology
Physical Sciences
Physics, Applied
Physics, Condensed Matter
Physics, Mathematical
Physics
ultrafine grain
dynamic transformation
deformation substructure
misorientation
steel
DEFORMATION
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 changed 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 temperature that then act as sites for static transformation. © 2008 World Scientific Publishing Company.
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2008, World Scientific Publishing
Persistent URL http://hdl.handle.net/10536/DRO/DU:30078087

Document type: Journal Article
Collection: Institute for Frontier Materials
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