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Grain size effect on the warm deformation behaviour of a Ti-IF steel

Oudin, Alexis, Barnett, Matthew and Hodgson, Peter 2004, Grain size effect on the warm deformation behaviour of a Ti-IF steel, Materials science & engineering A. Structural materials : properties, microstructure and processing, vol. 367, no. 1-2, pp. 282-294.

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Title Grain size effect on the warm deformation behaviour of a Ti-IF steel
Author(s) Oudin, Alexis
Barnett, Matthew
Hodgson, Peter
Journal name Materials science & engineering A. Structural materials : properties, microstructure and processing
Volume number 367
Issue number 1-2
Start page 282
End page 294
Publisher Elsevier B.V.
Place of publication Amsterdam, Netherlands
Publication date 2004
ISSN 0921-5093
Keyword(s) IF steel
ferrite deformation
warm deformation
flow curve
torsion test
Summary The effect of grain size on the warm deformation behaviour of a titanium stabilized interstitial free (IF) steel was investigated using hot torsion. The initial work hardening regime is followed by the development of a broad stress peak after which work softening occurs. The hypothetical saturation stress (Estrin–Mecking model) and the stress at final strain were relatively insensitive to grain size. However, the strain to the peak stress was strongly dependent on the grain size at low values of the Zener–Hollomon parameter. A simple phenomenological approach, using a combined Estrin–Mecking model and an Avrami type equation, was used to model the flow curves. The hypothetical saturation stress, the stress at final strain and the strain to peak stress were modelled using three different hyperbolic sine laws. A comparison with independent data from the literature shows that the apparent activation energy of deformation determined in this work (Q=372 kJ/mol) can be used to rationalize the steady-state stress in compression data found in the literature.
Language eng
Field of Research 091207 Metals and Alloy Materials
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:30002836

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