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The evolution of microbands and their interaction with NbC precipitates during hot deformation of a Fe-30Ni-Nb model austenitic steel

Poddar, Debasis, Cizek, Pavel, Beladi, Hossein and Hodgson, Peter D. 2015, The evolution of microbands and their interaction with NbC precipitates during hot deformation of a Fe-30Ni-Nb model austenitic steel, Acta materialia, vol. 99, pp. 347-362, doi: 10.1016/j.actamat.2015.08.003.

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Title The evolution of microbands and their interaction with NbC precipitates during hot deformation of a Fe-30Ni-Nb model austenitic steel
Author(s) Poddar, Debasis
Cizek, Pavel
Beladi, Hossein
Hodgson, Peter D.
Journal name Acta materialia
Volume number 99
Start page 347
End page 362
Total pages 16
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-10-15
ISSN 1359-6454
1873-2453
Keyword(s) Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
Austenite
Hot compression
Transmission electron microscopy (TEM)
Microbands
Precipitates
STRAIN-INDUCED PRECIPITATION
INTERSTITIAL-FREE STEEL
ORIENTATION DEPENDENCE
GRAIN-ORIENTATION
SUBSTRUCTURE CHARACTERISTICS
DISLOCATION-STRUCTURES
BOUNDARY ALIGNMENT
ALUMINUM
KINETICS
ALLOY
Summary The present work has investigated the evolution of microbands (MBs) and their interaction with strain-induced NbC precipitates during uniaxial compression of a model austenitic Fe-30Ni-Nb steel at 925 °C. The (1 1 0) fibre grains, both without and with copious amounts of precipitates, contained up to large strains crystallographic MBs aligned close to the highly stressed {1 1 1} slip planes having large Schmid factors. The MBs thus maintained their crystallographic character during straining, through continuously rearranging themselves, and did not follow the macroscopically imposed rigid body rotation. During double-pass deformation, fine NbC particles formed at short inter-pass holding remained strongly pinned at small reloading strains and appeared to be dragged by rearranging MB walls. With increasing reloading strain, the fine precipitates became progressively released from the above walls. During reloading after increased holding time, the coarsened particles tended with their increased size to become increasingly detached from the MB walls already at a small strain. The precipitate-free MB wall segments rearranged during straining to maintain their crystallographic alignment, while the detached precipitates followed the sample shape change and rotated towards the compression plane. The MB wall rearrangement generally occurred through cooperative migration of the corresponding dislocation networks.
Language eng
DOI 10.1016/j.actamat.2015.08.003
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30078767

Document type: Journal Article
Collection: Institute for Frontier Materials
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