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A comparative assessment of iron and cobalt-based hard-facing alloy deformation using HR-EBSD and HR-DIC

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Title: A comparative assessment of iron and cobalt-based hard-facing alloy deformation using HR-EBSD and HR-DIC
Authors: Zhao, C
Stewart, D
Jiang, J
Dunne, FPE
Item Type: Journal Article
Abstract: Three iron-based alloys (Nitronic 60, Tristelle 5183 and RR2450) and a cobalt alloy (Stellite 6) are studied using bend-testing to induce progressive straining and both high resolution DIC and EBSD are utilized to provide quantitative characterization of the deformation mechanisms. The roles of austenite, ferrite and carbide/silicide phases are investigated, together with how each contributes to slip activation and localisation, GND development and hardening through to particle pull-out and fracture. The observed mechanisms are discussed in the context of galling performance. The results suggest that a distribution of fine precipitates, both intra-granular and at grain/phase boundaries, promote more homogeneous and distributed slip, and the development of distributed higher densities of GNDs. The latter promotes hardening which in turn also facilitates homogeneity of deformation and potentially better galling resistance. A uniform size of fine precipitates is also helpful; large silicides lead to particle fracture and pull-out, likely highly damaging under conditions of sliding contact and galling.
Issue Date: 15-Oct-2018
Date of Acceptance: 12-Aug-2018
URI: http://hdl.handle.net/10044/1/68967
DOI: https://dx.doi.org/10.1016/j.actamat.2018.08.021
ISSN: 1359-6454
Publisher: Elsevier
Start Page: 173
End Page: 186
Journal / Book Title: Acta Materialia
Volume: 159
Copyright Statement: © 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
Hard-facing alloys
EBSD
DIC
Galling
HARDFACING ALLOYS
WEAR-RESISTANCE
DISLOCATION DENSITY
STEELS
COPPER
DISTRIBUTIONS
TEMPERATURE
BOUNDARIES
BEHAVIOR
GRAIN
0912 Materials Engineering
0913 Mechanical Engineering
Materials
Publication Status: Published
Online Publication Date: 2018-08-15
Appears in Collections:Mechanical Engineering
Materials



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