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Nucleation sites for ultrafine ferrite produced by deformation of austenite during single-pass strip rolling

Hurley, P.J., Muddle, B.C. and Hodgson, Peter 2000, Nucleation sites for ultrafine ferrite produced by deformation of austenite during single-pass strip rolling, Metallurgical and materials transactions. A, physical metallurgy and materials science, vol. 32, no. 6, pp. 1507-1517, doi: 10.1007/s11661-001-0238-z.

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Title Nucleation sites for ultrafine ferrite produced by deformation of austenite during single-pass strip rolling
Author(s) Hurley, P.J.
Muddle, B.C.
Hodgson, Peter
Journal name Metallurgical and materials transactions. A, physical metallurgy and materials science
Volume number 32
Issue number 6
Start page 1507
End page 1517
Publisher Minerals, Metals & Materials Society
Place of publication Warrendale, PA
Publication date 2000-08-31
ISSN 1073-5623
1543-1940
Summary An austenitic Ni-30 wt pct Fe alloy, with a stacking-fault energy and deformation characteristics similar to those of austenitic low-carbon steel at elevated temperatures, has been used to examine the defect substructure within austenite deformed by single-pass strip rolling and to identify those features most likely to provide sites for intragranular nucleation of ultrafine ferrite in steels. Samples of this alloy and a 0.095 wt pct C-1.58Mn-0.22Si-0.27Mo steel have been hot rolled and cooled under similar conditions, and the resulting microstructures were compared using transmission electron microscopy (TEM), electron diffraction, and X-ray diffraction. Following a single rolling pass of ∼40 pct reduction of a 2mm strip at 800 °C, three microstructural zones were identified throughout its thickness. The surface zone (of 0.1 to 0.4 mm in depth) within the steel comprised a uniform microstructure of ultrafine ferrite, while the equivalent zone of a Ni-30Fe alloy contained a network of dislocation cells, with an average diameter of 0.5 to 1.0 µm. The scale and distribution and, thus, nucleation density of the ferrite grains formed in the steel were consistent with the formation of individual ferrite nuclei on cell boundaries within the austenite. In the transition zone, 0.3 to 0.5 mm below the surface of the steel strip, discrete polygonal ferrite grains were observed to form in parallel, and closely spaced “rafts” traversing individual grains of austenite. Based on observations of the equivalent zone of the rolled Ni-30Fe alloy, the ferrite distribution could be correlated with planar defects in the form of intragranular microshear bands formed within the deformed austenite during rolling. Within the central zone of the steel strip, a bainitic microstructure, typical of that observed after conventional hot rolling of this steel, was observed following air cooling. In this region of the rolled Ni-30Fe alloy, a network of microbands was observed, typical of material deformed under plane-strain conditions.
Notes Available online: April 07, 2007
Language eng
DOI 10.1007/s11661-001-0238-z
Field of Research 091299 Materials Engineering not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2001
Copyright notice ©Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30006434

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