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Formation of ultra-fine ferrite in hot rolled strip: potential mechanisms for grain refinement

Hurley, P.J. and Hodgson, Peter 2001, Formation of ultra-fine ferrite in hot rolled strip: potential mechanisms for grain refinement, Materials science & engineering. A. Structural materials : properties, microstructure and processing, vol. 302, pp. 206-214, doi: 10.1016/S0921-5093(00)01823-2.

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Title Formation of ultra-fine ferrite in hot rolled strip: potential mechanisms for grain refinement
Author(s) Hurley, P.J.
Hodgson, Peter
Journal name Materials science & engineering. A. Structural materials : properties, microstructure and processing
Volume number 302
Start page 206
End page 214
Publisher Elsevier Sequoia
Place of publication Lausanne, Switzerland
Publication date 2001-04-30
ISSN 0921-5093
1873-4936
Keyword(s) ultra-fine ferrite
thermomechanical processing
low-carbon steel
strip rolling
dynamic strain-induced transformation
Summary A novel single-pass hot strip rolling process has been developed in which ultra-fine (<2 μm) ferrite grains form at the surface of hot rolled strip in two low carbon steels with average austenite grain sizes above 200 μm. Two experiments were performed on strip that had been re-heated to 1250°C for 300 s and air-cooled to the rolling temperatures. The first involved hot rolling a sample of 0.09 wt.%C–1.68Mn–0.22Si–0.27Mo steel (steel A) at 800°C, which was just above the Ar3 of this sample, while the second involved hot rolling a sample of 0.11C–1.68Mn–0.22Si steel (steel B) at 675°C, which is just below the Ar3 temperature of the sample. After air cooling, the surface regions of strip of both steel A and B consisted of ultra-fine ferrite grains which had formed within the large austenite grains, while the central regions consisted of a bainitic microstructure. In the case of steel B, a network of allotriomorphic ferrite delineated the prior-austenite grain boundaries throughout the strip cross-section. Based on results from optical microscopy and scanning/transmission electron microscopy, as well as bulk X-ray texture analysis and microtextural analysis using Electron Back-Scattered Diffraction (EBSD), it is shown that the ultra-fine ferrite most likely forms by a process of rapid intragranular nucleation during, or immediately after, deformation. This process of inducing intragranular nucleation of ferrite by deformation is referred to as strain-induced transformation.
Notes Available online 8 March 2001.
Language eng
DOI 10.1016/S0921-5093(00)01823-2
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2001, Elsevier Science B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30006433

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