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The production of ultrafine ferrite in low-carbon steel by strain-Induced transformation

journal contribution
posted on 2001-02-05, 00:00 authored by M Hickson, P Hurley, R Gibbs, Georgina Kelly, Peter HodgsonPeter Hodgson
An investigation into the production of ultrafine (1 µm) equiaxed ferrite (UFF) grains in low-carbon steel was made using laboratory rolling, compression dilatometry, and hot torsion techniques. It was found that the hot rolling of thin strip, with a combination of high shear strain and high undercooling, provided the conditions most suitable for the formation of this type of microstructure. Although high strains could be applied in compression and torsion experiments, large volume fractions of UFF were not observed in those samples, possibly due to the lower level of undercooling achieved. It is thought that ferrite refinement was due to a strain-induced transformation process, and that ferrite grains nucleated on parallel and linear deformation bands that traversed austenite grains. These bands formed during the deformation process, and the undercooling provided by the contact between the strip and the work rolls was sufficient to drive the transformation to homogeneous UFF grains.

History

Journal

Metallurgical and materials transactions A : physical metallurgy and materials science

Volume

33

Issue

4

Pagination

1019 - 1026

Publisher

Minerals, Metals & Materials Society

Location

Warrendale, PA

ISSN

1073-5623

eISSN

1543-1940

Language

eng

Notes

Available online: April 17 2007

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

Springer