New insights into the dynamic and metadynamic recrystallization of austenite

Hodgson, Peter D., Cizek, Pavel and Beladi, Hossein 2012, New insights into the dynamic and metadynamic recrystallization of austenite, Materials science forum, vol. 715-716, no. 2012, pp. 259-266, doi: 10.4028/www.scientific.net/MSF.715-716.259.

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Title New insights into the dynamic and metadynamic recrystallization of austenite
Author(s) Hodgson, Peter D.
Cizek, Pavel
Beladi, HosseinORCID iD for Beladi, Hossein orcid.org/0000-0003-0131-707X
Journal name Materials science forum
Volume number 715-716
Issue number 2012
Start page 259
End page 266
Total pages 8
Publisher Trans Tech Publications
Place of publication Stafa-Zurich, Switzerland
Publication date 2012
ISSN 0255-5476
Keyword(s) dynamic recrystallization
metadynamic recrystallization
dislocation substructure
crystallographic texture
Ni-30%Fe Austenitic alloy
hot torsion
Summary The present work provides a summary of the recent findings obtained from the experimental investigation of the grain structure, crystallographic texture and dislocation substructure evolution in an austenitic Ni-30%Fe model alloy during dynamic recrystallization (DRX) and post-dynamic annealing. It has been found that the DRX texture characteristics become increasingly dominated by the low Taylor factor grains during DRX development, which presumably results from the preferred nucleation and lower consumption rates of these grains. The substructure of DRX grains is “random” in character and displays complex, hierarchical subgrain/cell arrangements characterized by accumulation of misorientations across significant distances. The stored energy within DRX grains appears to be principally consistent with the corresponding Taylor factor values. The changes observed within the fully dynamically recrystallized microstructure during postdynamic annealing have provided a basis to suggest a novel mechanism of metadynamic softening for the current experimental conditions. It is proposed that the initial softening stage involves rapid growth of the dynamically formed nuclei and migration of the mobile boundaries. The subboundaries within DRX grains progressively disintegrate through dislocation climb and dislocation annihilation, which ultimately leads to the formation of dislocation-free grains, and the grain boundary migration gradually becomes slower. As a result, the DRX texture largely remains preserved throughout the annealing process.
Language eng
DOI 10.4028/www.scientific.net/MSF.715-716.259
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861103 Basic Iron and Steel Products
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, Trans Tech Publications
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047080

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