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Microstructural evolution of ultrafine grained structure in plain carbon steels through single pass rolling

Beladi, Hossein, Kelly, Georgina and Hodgson, Peter 2004, Microstructural evolution of ultrafine grained structure in plain carbon steels through single pass rolling, Materials science and technology, vol. 20, no. 12, pp. 1538-1544.

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Title Microstructural evolution of ultrafine grained structure in plain carbon steels through single pass rolling
Author(s) Beladi, Hossein
Kelly, Georgina
Hodgson, Peter
Journal name Materials science and technology
Volume number 20
Issue number 12
Start page 1538
End page 1544
Publisher Maney Publishing
Place of publication Leeds, England
Publication date 2004-12
ISSN 0267-0836
Keyword(s) ultrafine ferrite
plain carbon steels
thermomechanical processing
dynamic strain induced transformation
carbon content
deformation temperature
Summary In the present study, the effect of nominal equivalent strain (between 0 and 1.2), deformation temperature (790– 750°C) and carbon content (0.06 – 0.35%C) was investigated on ferrite grain refinement through dynamic strain induced transformation (DSIT) in plain carbon steels in single pass rolling. The microstructural evolution of the transformation of austenite to ferrite has been evaluated through the thickness of the strip. The results showed a number of important microstructural features as a function of strain, which could be classified into three regions; no DSIT region, DSIT region, and ultrafine ferrite (UFF) grain region. Hence, two critical strains; dynamic strain induced transformation (εC, DSIT) and ultrafine ferrite formation (εC, UFF) were determined. These strains were increased significantly with an increase in carbon content. The critical strain for UFF formation reduced with decrease in deformation temperature. The UFF microstructure consisted of ultrafine, equiaxed ferrite grains (<2 μm) with very fine cementite particles. In the centre of the rolled strip, there was a conventional ferrite– pearlite microstructure, although ferrite grain refinement and the volume fraction of ferrite increased with increase in the nominal equivalent strain.
Notes Reproduced with the specific permission of the copyright owner.
Language eng
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, Institute of Materials, Minerals and Mining.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30002828

Document type: Journal Article
Collection: School of Engineering and Technology
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