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The production of ultrafine ferrite during hot torsion testing of a 0.11 Wt Pct C steel

Hurley, P. J., Muddle, B. C. and Hodgson, Peter 2002, The production of ultrafine ferrite during hot torsion testing of a 0.11 Wt Pct C steel, Metallurgical and materials transactions. A, Physical metallurgy and materials science, vol. 33, no. 9, pp. 2985-2993, doi: 10.1007/s11661-002-0283-2.

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Title The production of ultrafine ferrite during hot torsion testing of a 0.11 Wt Pct C steel
Author(s) Hurley, P. J.
Muddle, B. C.
Hodgson, Peter
Journal name Metallurgical and materials transactions. A, Physical metallurgy and materials science
Volume number 33
Issue number 9
Start page 2985
End page 2993
Publisher ASM International
Place of publication Warrendale, Pa.
Publication date 2002-09
ISSN 1073-5623
1543-1940
Summary Ultrafine ferrite grain sizes were produced in a 0.11C-1.6Mn-0.2Si steel by torsion testing isothermally at 675 °C after air cooling from 1250 °C. The ferrite was observed to form intragranularly beyond a von Mises equivalent tensile strain of approximately 0.7 to 0.8 and the number fraction of intragranular ferrite grains continued to increase as the strain level increased. Ferrite nucleated to form parallel and closely spaced linear arrays or “rafts” of many discrete ultrafine ferrite grains. It is shown that ferrite nucleates during deformation on defects developed within the austenite parallel to the macroscopic shear direction (i.e., dynamic strain-induced transformation). A model austenitic Ni-30Fe alloy was used to study the substructure developed in the austenite under similar test conditions as that used to induce intragranular ferrite in the steel. It is shown that the most prevalent features developed during testing are microbands. It is proposed that high-energy jogged regions surrounding intersecting microbands provide potential sites for ferrite nucleation at lower strains, while at higher strains, the walls of the microbands may also act as nucleation sites.
Language eng
DOI 10.1007/s11661-002-0283-2
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008553

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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