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Dilatancy in semi-solid steels at high solid fraction

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Title: Dilatancy in semi-solid steels at high solid fraction
Authors: Kareh, KM
O'Sullivan, C
Nagira, T
Yasuda, H
Gourlay, C
Item Type: Journal Article
Abstract: The study of mushy - zone deformation in steels is importan t for limit ing defect formation in continuous casting. Here, we use in situ synchrotron radiography to quantify the shear deformation mechanisms of a n equiaxed carbon steel at a solid fraction >0.9 and to understand how these mechanisms lead to casting defects . We show that the grain assembly undergoes shear - induced dilation (Rey nolds’ dilatancy) which opens liquid - filled fissures and cracks at high solid fraction . We further show a complex interaction between grain rearrangement, grain deformation and local coarsening, where rearrangement reduces the grain - grain contact area and coordination number which alters the stress network and also drives coarsening as grains move apart.
Issue Date: 10-Dec-2016
Date of Acceptance: 29-Nov-2016
URI: http://hdl.handle.net/10044/1/43250
DOI: https://dx.doi.org/10.1016/j.actamat.2016.11.066
ISSN: 1873-2453
Publisher: Elsevier
Start Page: 187
End Page: 195
Journal / Book Title: Acta Materialia
Volume: 125
Copyright Statement: © 2016 Published by Elsevier Ltd on behalf of Acta Materialia Inc. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/K026763/1
EP/M002241/1
Keywords: 0912 Materials Engineering
0913 Mechanical Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Materials
Civil and Environmental Engineering
Faculty of Natural Sciences



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