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Low cycle fatigue of a directionally solidified nickel-based superalloy: Testing, characterisation and modelling

R.J. Kashinga, L.G. Zhao, V.V. Silberschmidt, F. Farukh, N.C. Barnard, M.T. Whittaker, D. Proprentner, B. Shollock, G. McColvin, Mark Whittaker Orcid Logo

Materials Science and Engineering: A, Volume: 708, Pages: 503 - 513

Swansea University Author: Mark Whittaker Orcid Logo

Abstract

Low cycle fatigue (LCF) of a low-carbon (LC) directionally-solidified (DS) nickel-base superalloy, CM247 LC DS, was investigated using both experimental and computational methods. Strain-controlled LCF tests were conducted at 850°C, with a loading direction either parallel or perpendicular to the so...

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Published in: Materials Science and Engineering: A
ISSN: 09215093
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa35975
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spelling 2017-12-05T16:07:18.5770509 v2 35975 2017-10-09 Low cycle fatigue of a directionally solidified nickel-based superalloy: Testing, characterisation and modelling a146c6d442cb2c466d096179f9ac97ca 0000-0002-5854-0726 Mark Whittaker Mark Whittaker true false 2017-10-09 MTLS Low cycle fatigue (LCF) of a low-carbon (LC) directionally-solidified (DS) nickel-base superalloy, CM247 LC DS, was investigated using both experimental and computational methods. Strain-controlled LCF tests were conducted at 850°C, with a loading direction either parallel or perpendicular to the solidification direction. Trapezoidal loading-waveforms with 2 s and 200 s dwell times imposed at the minimum and the maximum strains were adopted for the testing. A constant strain range of 2% was maintained throughout the fully-reversed loading conditions (strain ratio R = −1). The observed fatigue life was shorter when the loading direction was perpendicular to the solidification one, indicating an anisotropic material response. It was found that the stress amplitude remained almost constant until final fracture, suggesting limited cyclic hardening/softening. Also, stress relaxation was clearly observed during the dwell period. Scanning Electron Microscopy fractographic analyses showed evidence of similar failure modes in all the specimens. To understand deformation at grain level, crystal plasticity finite element modelling was carried out based on grain textures measured with EBSD. The model simulated the full history of cyclic stress-strain responses. It was particularly revealed that the misorientations between columnar grains resulted in heterogeneous deformation and localised stress concentrations, which became more severe when the loading direction was normal to a solidification direction, explaining the shorter fatigue life observed. Journal Article Materials Science and Engineering: A 708 503 513 09215093 Low cycle fatigue; Directional solidification; Crystal plasticity; Grain misorientations; Stress concentration 31 12 2017 2017-12-31 10.1016/j.msea.2017.10.024 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2017-12-05T16:07:18.5770509 2017-10-09T09:21:00.4852551 College of Engineering Engineering R.J. Kashinga 1 L.G. Zhao 2 V.V. Silberschmidt 3 F. Farukh 4 N.C. Barnard 5 M.T. Whittaker 6 D. Proprentner 7 B. Shollock 8 G. McColvin 9 Mark Whittaker 0000-0002-5854-0726 10 0035975-09102017092300.pdf kashinga2017.pdf 2017-10-09T09:23:00.7200000 Output 1741382 application/pdf Accepted Manuscript true 2018-10-07T00:00:00.0000000 true eng
title Low cycle fatigue of a directionally solidified nickel-based superalloy: Testing, characterisation and modelling
spellingShingle Low cycle fatigue of a directionally solidified nickel-based superalloy: Testing, characterisation and modelling
Mark Whittaker
title_short Low cycle fatigue of a directionally solidified nickel-based superalloy: Testing, characterisation and modelling
title_full Low cycle fatigue of a directionally solidified nickel-based superalloy: Testing, characterisation and modelling
title_fullStr Low cycle fatigue of a directionally solidified nickel-based superalloy: Testing, characterisation and modelling
title_full_unstemmed Low cycle fatigue of a directionally solidified nickel-based superalloy: Testing, characterisation and modelling
title_sort Low cycle fatigue of a directionally solidified nickel-based superalloy: Testing, characterisation and modelling
author_id_str_mv a146c6d442cb2c466d096179f9ac97ca
author_id_fullname_str_mv a146c6d442cb2c466d096179f9ac97ca_***_Mark Whittaker
author Mark Whittaker
author2 R.J. Kashinga
L.G. Zhao
V.V. Silberschmidt
F. Farukh
N.C. Barnard
M.T. Whittaker
D. Proprentner
B. Shollock
G. McColvin
Mark Whittaker
format Journal article
container_title Materials Science and Engineering: A
container_volume 708
container_start_page 503
publishDate 2017
institution Swansea University
issn 09215093
doi_str_mv 10.1016/j.msea.2017.10.024
college_str College of Engineering
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hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
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description Low cycle fatigue (LCF) of a low-carbon (LC) directionally-solidified (DS) nickel-base superalloy, CM247 LC DS, was investigated using both experimental and computational methods. Strain-controlled LCF tests were conducted at 850°C, with a loading direction either parallel or perpendicular to the solidification direction. Trapezoidal loading-waveforms with 2 s and 200 s dwell times imposed at the minimum and the maximum strains were adopted for the testing. A constant strain range of 2% was maintained throughout the fully-reversed loading conditions (strain ratio R = −1). The observed fatigue life was shorter when the loading direction was perpendicular to the solidification one, indicating an anisotropic material response. It was found that the stress amplitude remained almost constant until final fracture, suggesting limited cyclic hardening/softening. Also, stress relaxation was clearly observed during the dwell period. Scanning Electron Microscopy fractographic analyses showed evidence of similar failure modes in all the specimens. To understand deformation at grain level, crystal plasticity finite element modelling was carried out based on grain textures measured with EBSD. The model simulated the full history of cyclic stress-strain responses. It was particularly revealed that the misorientations between columnar grains resulted in heterogeneous deformation and localised stress concentrations, which became more severe when the loading direction was normal to a solidification direction, explaining the shorter fatigue life observed.
published_date 2017-12-31T03:48:59Z
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