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Microstructure evolution and softening processes occurring during annealing of hot deformed Ni-30Fe austenite

Hodgson, P. D., Cizek, P., Beladi, H. and Taylor, A. 2012, Microstructure evolution and softening processes occurring during annealing of hot deformed Ni-30Fe austenite, Materials science forum, vol. 706-709, pp. 2134-2139.

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Title Microstructure evolution and softening processes occurring during annealing of hot deformed Ni-30Fe austenite
Author(s) Hodgson, P. D.
Cizek, P.
Beladi, H.
Taylor, A.
Journal name Materials science forum
Volume number 706-709
Start page 2134
End page 2139
Total pages 6
Publisher Trans Tech Publications
Place of publication Stafa-Zurich, Switzerland
Publication date 2012
ISSN 0255-5476
Keyword(s) Ni-30Fe alloy
hot torsion
post-deformation annealing
dynamic recrystallization
metadynamic recrystallization
substructure
texture
Summary The current work investigates the microstructure evolution and softening processes that take place during annealing of an austenitic Ni-30Fe model alloy subjected to hot deformation in the dynamic recrystallization (DRX) regime. The substructure of the deformed matrix grains largely comprised organized microband arrays, though that of the DRX grains consisted of more random, complex subgrain/cell arrangements. This substructure disparity was also reflected by the distinct difference in the mechanism of post-deformation softening taking place during annealing of the deformed matrix and DRX grains. In the former, the recrystallization process took place through nucleation and growth of new grains fully replacing the deformed structure, as expected for the classical static recrystallization (SRX). The corresponding texture was essentially random, in contrast to that of the DRX grains dominated by low Taylor factor components. The microbands originally present within the deformed matrix grains displayed some tendency to disintegrate during annealing, nonetheless, they remained largely preserved even at prolonged holding times. During annealing of the fully DRX microstructure, a novel softening mechanism was revealed. The initial post-dynamic softening stage involved rapid growth of the dynamically formed nuclei and migration of the mobile boundaries in correspondence with the well-established metadynamic recrystallization (MDRX) mechanism. However, in contrast to the deformed matrix, SRX was not observed and the sub-boundaries within DRX grains rapidly disintegrated through dislocation climb and dislocation annihilation, which led to the formation of dislocation-free grains already at short holding times. Consequently, the DRX texture initially became slightly weakened and then remained largely preserved throughout the annealing process.
Notes Article first available online 3rd January 2012
Language eng
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:30044093

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