The role of recrystallization and coarsening in the formation of ultrafine grained steels through thermomechanical processing.

Hodgson, Peter and Beladi, Hossein 2004, The role of recrystallization and coarsening in the formation of ultrafine grained steels through thermomechanical processing., Materials science forum, vol. 467, no. 470, pp. 1137-1144.

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Title The role of recrystallization and coarsening in the formation of ultrafine grained steels through thermomechanical processing.
Author(s) Hodgson, Peter
Beladi, HosseinORCID iD for Beladi, Hossein orcid.org/0000-0003-0131-707X
Journal name Materials science forum
Volume number 467
Issue number 470
Start page 1137
End page 1144
Publisher Trans Tech Publications
Place of publication Aedermannsdorf, Switzerland
Publication date 2004
ISSN 0255-5476
Keyword(s) ultrafine ferrite
torsion testing
nucleation, recrystallization
grain growth
coarsening
Summary There is now considerable interest in the development of ultrafine grained steels with an average grain size of the order of 1µm. One of the methods with currently the greatest industrial interest is by dynamic strain induced transformation from austenite to ferrite. This involves deformation below the
equilibrium transformation temperature so that transformation occurs during the deformation. However, large strains are required to completely transform the microstructure during deformation. It is potentially possible to activate transformation during deformation then continue transformation
during subsequent cooling. It is shown that there are two critical strains: the first is where dynamic transformation commences and the second is the minimum strain for a fully ultrafine final microstructure after cooling to room temperature. The deformation and potential role of dynamic
recrystallization of the dynamically formed ferrite is also considered. Overall it is clear that for full industrial exploitation there is a need to understand and exploit the competing issues of nucleation, growth and recrystallization of the ferrite by both dynamic and static processes.
Language eng
Field of Research 091399 Mechanical Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2004, Trans Tech Publications
Persistent URL http://hdl.handle.net/10536/DRO/DU:30002838

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