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The effect of oxidising thermal exposures on the fatigue properties of a polycrystalline powder metallurgy nickel-based superalloy

David Lewis, R.G. Ding, Mark Whittaker Orcid Logo, P.M. Mignanelli, M.C. Hardy

Materials & Design, Volume: 189, Start page: 108529

Swansea University Authors: David Lewis, Mark Whittaker Orcid Logo

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Abstract

A number of thermal exposures were undertaken to determine the effect oxidation has on the fatigue lives of the nickel-based superalloy RR1000. The thermal exposures initially caused a considerable reduction in the fatigue lives with increasing oxidation. However, the longest exposure time resulted...

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Published in: Materials & Design
ISSN: 0264-1275
Published: Elsevier BV 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53385
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spelling 2020-10-22T13:07:07.0299811 v2 53385 2020-01-29 The effect of oxidising thermal exposures on the fatigue properties of a polycrystalline powder metallurgy nickel-based superalloy f52973928db300e06885ef9aabde1d63 David Lewis David Lewis true false a146c6d442cb2c466d096179f9ac97ca 0000-0002-5854-0726 Mark Whittaker Mark Whittaker true false 2020-01-29 FGSEN A number of thermal exposures were undertaken to determine the effect oxidation has on the fatigue lives of the nickel-based superalloy RR1000. The thermal exposures initially caused a considerable reduction in the fatigue lives with increasing oxidation. However, the longest exposure time resulted in an S-N curve that lay between the shortest and mid length exposure. A range of analyses were undertaken to determine the presence of any mechanisms that could have caused this unexpected life increase; vacuum thermal exposures, small punch tensile, nanoindentation, microscopy and transmission Kikuchi diffraction. It was found that few of the mechanisms investigated were likely to have an effect on the change in life with the exceptions being; reduction in dislocation movement and crack deflection as a result of a recrystallised zone at the surface, variation in hardness of different regions due to a γ′ depleted plastic zone and a hard ceramic oxide, and reduced initiations due to the presence of a ‘healing’ chromium oxide scale. Notch fatigue tests were performed to determine the importance of the findings to components in service and it was found that the notch acted as the cause of crack initiation, effectively mitigating against the effects of the oxidation damage. Journal Article Materials & Design 189 108529 Elsevier BV 0264-1275 Ni-based superalloys; Fatigue behaviour; Micro-/nanoindentation; Profilometry; Transmission electron microscopy (TEM) 1 4 2020 2020-04-01 10.1016/j.matdes.2020.108529 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University UKRI, EP/H022309/1 2020-10-22T13:07:07.0299811 2020-01-29T12:30:28.4219625 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering David Lewis 1 R.G. Ding 2 Mark Whittaker 0000-0002-5854-0726 3 P.M. Mignanelli 4 M.C. Hardy 5 53385__16516__e42eb64d3d1b4987932e308ea4921de5.pdf 53385.pdf 2020-02-03T16:27:50.7955600 Output 3547266 application/pdf Version of Record true 2020-02-05T00:00:00.0000000 Released under the terms of a Creative Commons License (CC-BY). true eng http://creativecommons.org/licenses/by/4.0/
title The effect of oxidising thermal exposures on the fatigue properties of a polycrystalline powder metallurgy nickel-based superalloy
spellingShingle The effect of oxidising thermal exposures on the fatigue properties of a polycrystalline powder metallurgy nickel-based superalloy
David Lewis
Mark Whittaker
title_short The effect of oxidising thermal exposures on the fatigue properties of a polycrystalline powder metallurgy nickel-based superalloy
title_full The effect of oxidising thermal exposures on the fatigue properties of a polycrystalline powder metallurgy nickel-based superalloy
title_fullStr The effect of oxidising thermal exposures on the fatigue properties of a polycrystalline powder metallurgy nickel-based superalloy
title_full_unstemmed The effect of oxidising thermal exposures on the fatigue properties of a polycrystalline powder metallurgy nickel-based superalloy
title_sort The effect of oxidising thermal exposures on the fatigue properties of a polycrystalline powder metallurgy nickel-based superalloy
author_id_str_mv f52973928db300e06885ef9aabde1d63
a146c6d442cb2c466d096179f9ac97ca
author_id_fullname_str_mv f52973928db300e06885ef9aabde1d63_***_David Lewis
a146c6d442cb2c466d096179f9ac97ca_***_Mark Whittaker
author David Lewis
Mark Whittaker
author2 David Lewis
R.G. Ding
Mark Whittaker
P.M. Mignanelli
M.C. Hardy
format Journal article
container_title Materials & Design
container_volume 189
container_start_page 108529
publishDate 2020
institution Swansea University
issn 0264-1275
doi_str_mv 10.1016/j.matdes.2020.108529
publisher Elsevier BV
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
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description A number of thermal exposures were undertaken to determine the effect oxidation has on the fatigue lives of the nickel-based superalloy RR1000. The thermal exposures initially caused a considerable reduction in the fatigue lives with increasing oxidation. However, the longest exposure time resulted in an S-N curve that lay between the shortest and mid length exposure. A range of analyses were undertaken to determine the presence of any mechanisms that could have caused this unexpected life increase; vacuum thermal exposures, small punch tensile, nanoindentation, microscopy and transmission Kikuchi diffraction. It was found that few of the mechanisms investigated were likely to have an effect on the change in life with the exceptions being; reduction in dislocation movement and crack deflection as a result of a recrystallised zone at the surface, variation in hardness of different regions due to a γ′ depleted plastic zone and a hard ceramic oxide, and reduced initiations due to the presence of a ‘healing’ chromium oxide scale. Notch fatigue tests were performed to determine the importance of the findings to components in service and it was found that the notch acted as the cause of crack initiation, effectively mitigating against the effects of the oxidation damage.
published_date 2020-04-01T04:02:28Z
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