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Concurrent microstructural evolution of ferrite and austenite in a duplex stainless steel processed by high-pressure torsion

Title
Concurrent microstructural evolution of ferrite and austenite in a duplex stainless steel processed by high-pressure torsion
Author
Megumi Kawasaki
Keywords
Steel; High-pressure torsion; Twinning; De-twinning; Grain refinement; STACKING-FAULT ENERGY; CU-AL ALLOYS; INDUCED PLASTICITY STEELS; CENTERED-CUBIC METALS; HALL-PETCH RELATIONSHIP; MECHANICAL-PROPERTIES; NANOCRYSTALLINE MATERIALS; DEFORMATION MECHANISMS; GRAIN-REFINEMENT; TWIN INTERACTIONS
Issue Date
2014-01
Publisher
PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Citation
Acta Materialia, Vol. 63, 15 January 2014, Pages 16-29
Abstract
A duplex stainless steel with approximately equal volume fractions of ferrite and austenite was processed by high-pressure torsion. Nano-indentation, electron backscatter diffraction and transmission electron microscopy were used to investigate the hardness and microstructure evolutions of the steel. Despite the different strain-hardening rates of individual ferrite and austenite, the microstructures of the two phases evolved concurrently in such a way that the neighbouring two phases always maintained similar hardness. While the plastic deformation and grain refinement of ferrite occurred mainly via dislocation activities, the plastic deformation and grain refinement process of austenite were more complicated and included deformation twinning and de-twinning in coarse grains, grain refinement by twinning and dislocation twin interactions, de-twinning in ultrafine grains and twin boundary subdivision. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S1359645413007155http://hdl.handle.net/20.500.11754/47503
ISSN
1359-6454
DOI
10.1016/j.actamat.2013.09.030
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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