EBSD and TEM investigation of the hot deformation substructure characteristics of a type 316L austenitic stainless steel

Cizek, P., Whiteman, J.A., Rainforth, W.M. and Beynon, J.H. 2004, EBSD and TEM investigation of the hot deformation substructure characteristics of a type 316L austenitic stainless steel, Journal of microscopy, vol. 213, no. 3, pp. 285-295.


Title EBSD and TEM investigation of the hot deformation substructure characteristics of a type 316L austenitic stainless steel
Author(s) Cizek, P.
Whiteman, J.A.
Rainforth, W.M.
Beynon, J.H.
Journal name Journal of microscopy
Volume number 213
Issue number 3
Start page 285
End page 295
Publisher Wiley-Blackwell
Place of publication Oxford, England
Publication date 2004-03
ISSN 0022-2720
1365-2818
Keyword(s) crystallographic texture
transmission electron microscopy
hot rolling
electron backscatter diffraction
dislocation substructure
Summary The evolution of crystallographic texture and deformation substructure was studied in a type 316L austenitic stainless steel, deformed in rolling at 900 °C to true strain levels of about 0.3 and 0.7. Electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) were used in the investigation and a comparison of the substructural characteristics obtained by these techniques was made. At the lower strain level, the deformation substructure observed by EBSD appeared to be rather poorly developed. There was considerable evidence of a rotation of the pre-existing twin boundaries from their original orientation relationship, as well as the formation of highly distorted grain boundary regions. In TEM, at this strain level, the substructure was more clearly revealed, although it appeared rather inhomogeneously developed from grain to grain. The subgrains were frequently elongated and their boundaries often approximated to traces of {111} slip planes. The corresponding misorientations were small and largely displayed a non-cumulative character. At the larger strain, the substructure within most grains became well developed and the corresponding misorientations increased. This resulted in better detection of sub-boundaries by EBSD, although the percentage of indexing slightly decreased. TEM revealed splitting of some sub-boundaries to form fine microbands, as well as the localized formation of microshear bands. The substructural characteristics observed by EBSD, in particular at the larger strain, generally appeared to compare well with those obtained using TEM. With increased strain level, the mean subgrain size became finer, the corresponding mean misorientation angle increased and both these characteristics became less dependent on a particular grain orientation. The statistically representative data obtained will assist in the development of physically based models of microstructural evolution during thermomechanical processing of austenitic stainless steels.
Language eng
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2004, The Royal Microscopical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30025771

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