Journal article 1162 views 184 downloads
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
Materials Science and Engineering: A, Volume: 708, Pages: 503 - 513
Swansea University Author:
Mark Whittaker
-
PDF | Accepted Manuscript
Download (1.68MB)
DOI (Published version): 10.1016/j.msea.2017.10.024
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...
Published in: | Materials Science and Engineering: A |
---|---|
ISSN: | 09215093 |
Published: |
2017
|
Online Access: |
Check full text
|
URI: | https://cronfa.swan.ac.uk/Record/cronfa35975 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
first_indexed |
2017-10-09T11:03:00Z |
---|---|
last_indexed |
2018-02-09T05:27:46Z |
id |
cronfa35975 |
recordtype |
SURis |
fullrecord |
<?xml version="1.0"?><rfc1807><datestamp>2017-12-05T16:07:18.5770509</datestamp><bib-version>v2</bib-version><id>35975</id><entry>2017-10-09</entry><title>Low cycle fatigue of a directionally solidified nickel-based superalloy: Testing, characterisation and modelling</title><swanseaauthors><author><sid>a146c6d442cb2c466d096179f9ac97ca</sid><ORCID>0000-0002-5854-0726</ORCID><firstname>Mark</firstname><surname>Whittaker</surname><name>Mark Whittaker</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2017-10-09</date><deptcode>MTLS</deptcode><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 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.</abstract><type>Journal Article</type><journal>Materials Science and Engineering: A</journal><volume>708</volume><paginationStart>503</paginationStart><paginationEnd>513</paginationEnd><publisher/><issnPrint>09215093</issnPrint><keywords>Low cycle fatigue; Directional solidification; Crystal plasticity; Grain misorientations; Stress concentration</keywords><publishedDay>31</publishedDay><publishedMonth>12</publishedMonth><publishedYear>2017</publishedYear><publishedDate>2017-12-31</publishedDate><doi>10.1016/j.msea.2017.10.024</doi><url/><notes/><college>COLLEGE NANME</college><department>Materials Science and Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>MTLS</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2017-12-05T16:07:18.5770509</lastEdited><Created>2017-10-09T09:21:00.4852551</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Engineering and Applied Sciences - Materials Science and Engineering</level></path><authors><author><firstname>R.J.</firstname><surname>Kashinga</surname><order>1</order></author><author><firstname>L.G.</firstname><surname>Zhao</surname><order>2</order></author><author><firstname>V.V.</firstname><surname>Silberschmidt</surname><order>3</order></author><author><firstname>F.</firstname><surname>Farukh</surname><order>4</order></author><author><firstname>N.C.</firstname><surname>Barnard</surname><order>5</order></author><author><firstname>M.T.</firstname><surname>Whittaker</surname><order>6</order></author><author><firstname>D.</firstname><surname>Proprentner</surname><order>7</order></author><author><firstname>B.</firstname><surname>Shollock</surname><order>8</order></author><author><firstname>G.</firstname><surname>McColvin</surname><order>9</order></author><author><firstname>Mark</firstname><surname>Whittaker</surname><orcid>0000-0002-5854-0726</orcid><order>10</order></author></authors><documents><document><filename>0035975-09102017092300.pdf</filename><originalFilename>kashinga2017.pdf</originalFilename><uploaded>2017-10-09T09:23:00.7200000</uploaded><type>Output</type><contentLength>1741382</contentLength><contentType>application/pdf</contentType><version>Accepted Manuscript</version><cronfaStatus>true</cronfaStatus><embargoDate>2018-10-07T00:00:00.0000000</embargoDate><copyrightCorrect>true</copyrightCorrect><language>eng</language></document></documents><OutputDurs/></rfc1807> |
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 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and 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 |
Faculty of Science and Engineering |
hierarchytype |
|
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 |
document_store_str |
1 |
active_str |
0 |
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 |
2017-12-31T03:44:55Z |
_version_ |
1763752118156525568 |
score |
11.021648 |