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Evolution of strain-induced precipitates in a model austenitic Fe-30Ni-Nb steel and their effect on the flow behaviour

Poddar,D, Cizek,P, Beladi,H and Hodgson,PD 2014, Evolution of strain-induced precipitates in a model austenitic Fe-30Ni-Nb steel and their effect on the flow behaviour, Acta Materialia, vol. 80, pp. 1-15, doi: 10.1016/j.actamat.2014.07.035.

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Title Evolution of strain-induced precipitates in a model austenitic Fe-30Ni-Nb steel and their effect on the flow behaviour
Author(s) Poddar,D
Cizek,P
Beladi,H
Hodgson,PD
Journal name Acta Materialia
Volume number 80
Start page 1
End page 15
Total pages 15
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2014
ISSN 1359-6454
Keyword(s) Austenitic steel
Dislocation boundaries
Hot compression
Strain-induced precipitation
Transmission electron microscopy
Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
MICROALLOYED AUSTENITE
HOT DEFORMATION
RECRYSTALLIZATION
NB
KINETICS
N)
CRYSTALLOGRAPHY
DISLOCATIONS
MECHANISM
ALLOYS
Summary The present work investigated the evolution of strain-induced NbC precipitates in a model austenitic Fe-30Ni-Nb steel deformed at 925 °C to a strain of 0.2 during post-deformation holding between 3 and 1000 s and their effect on the reloading flow stress. The precipitate particles preferentially nucleated on the nodes of the periodic dislocation networks constituting microband walls. Holding for 10 s resulted in the formation of fine, largely coherent NbC particles with a mean diameter of ∼5 nm, which displayed a cube-on-cube orientation relationship with austenite and caused the maximum increase in the reloading steady-state flow stress. A further increase in the holding time from 30 to 1000 s led to the formation of semi-coherent, gradually coarser and more widely spaced particles with a mean diameter of 8 nm and above, which led to a gradual decrease in the reloading steady-state flow stress. The holding time increase resulted in progressive disintegration of the dislocation substructure and dislocation annihilation through static recovery processes, which was also reflected by the measured softening fractions. The precipitate particle shape changed during post-deformation annealing from elliptical to faceted octahedral and subsequently to tetra-kai-decahedral. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Language eng
DOI 10.1016/j.actamat.2014.07.035
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861206 Structural Metal Products
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30068129

Document type: Journal Article
Collection: Institute for Frontier Materials
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