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Crack Growth of a Polycrystalline Nickel Alloy under TMF Loading

Christopher J. Pretty, Mark Whittaker Orcid Logo, Steve J. Williams

Advanced Materials Research, Volume: 891-892, Pages: 1302 - 1307

Swansea University Author: Mark Whittaker Orcid Logo

DOI (Published version): 10.4028/www.scientific.net/AMR.891-892.1302

Abstract

Thermo-mechanical fatigue (TMF) is an important factor for consideration when designing aero engine components due to recent gas turbine development, thus understanding failure mechanisms through crack growth testing is imperative. In the current work, a TMF crack growth testing method has been deve...

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Published in: Advanced Materials Research
Published: 2014
URI: https://cronfa.swan.ac.uk/Record/cronfa21249
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spelling 2018-01-19T19:08:39.6305628 v2 21249 2015-05-08 Crack Growth of a Polycrystalline Nickel Alloy under TMF Loading a146c6d442cb2c466d096179f9ac97ca 0000-0002-5854-0726 Mark Whittaker Mark Whittaker true false 2015-05-08 MTLS Thermo-mechanical fatigue (TMF) is an important factor for consideration when designing aero engine components due to recent gas turbine development, thus understanding failure mechanisms through crack growth testing is imperative. In the current work, a TMF crack growth testing method has been developed utilising induction heating and direct current potential drop techniques for polycrystalline nickel-based superalloys, such as RR1000. Results have shown that in-phase (IP) testing produces accelerated crack growth rates compared with out-of-phase (OOP) due to increased temperature at peak stress and therefore increased time dependent crack growth. The ordering of the crack growth rates is supported by detailed fractographic analysis which shows intergranular crack growth in IP test specimens, and transgranular crack growth in 90° OOP and 180°OOP tests. Isothermal tests have also been carried out for comparison of crack growth rates at the point of peak stress in the TMF cycles. Journal Article Advanced Materials Research 891-892 1302 1307 31 12 2014 2014-12-31 10.4028/www.scientific.net/AMR.891-892.1302 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2018-01-19T19:08:39.6305628 2015-05-08T13:41:58.8454087 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Christopher J. Pretty 1 Mark Whittaker 0000-0002-5854-0726 2 Steve J. Williams 3 0021249-14032016133233.pdf Melbourne.pdf 2016-03-14T13:32:33.6130000 Output 391355 application/pdf Accepted Manuscript true 2016-03-14T00:00:00.0000000 true
title Crack Growth of a Polycrystalline Nickel Alloy under TMF Loading
spellingShingle Crack Growth of a Polycrystalline Nickel Alloy under TMF Loading
Mark Whittaker
title_short Crack Growth of a Polycrystalline Nickel Alloy under TMF Loading
title_full Crack Growth of a Polycrystalline Nickel Alloy under TMF Loading
title_fullStr Crack Growth of a Polycrystalline Nickel Alloy under TMF Loading
title_full_unstemmed Crack Growth of a Polycrystalline Nickel Alloy under TMF Loading
title_sort Crack Growth of a Polycrystalline Nickel Alloy under TMF Loading
author_id_str_mv a146c6d442cb2c466d096179f9ac97ca
author_id_fullname_str_mv a146c6d442cb2c466d096179f9ac97ca_***_Mark Whittaker
author Mark Whittaker
author2 Christopher J. Pretty
Mark Whittaker
Steve J. Williams
format Journal article
container_title Advanced Materials Research
container_volume 891-892
container_start_page 1302
publishDate 2014
institution Swansea University
doi_str_mv 10.4028/www.scientific.net/AMR.891-892.1302
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 Thermo-mechanical fatigue (TMF) is an important factor for consideration when designing aero engine components due to recent gas turbine development, thus understanding failure mechanisms through crack growth testing is imperative. In the current work, a TMF crack growth testing method has been developed utilising induction heating and direct current potential drop techniques for polycrystalline nickel-based superalloys, such as RR1000. Results have shown that in-phase (IP) testing produces accelerated crack growth rates compared with out-of-phase (OOP) due to increased temperature at peak stress and therefore increased time dependent crack growth. The ordering of the crack growth rates is supported by detailed fractographic analysis which shows intergranular crack growth in IP test specimens, and transgranular crack growth in 90° OOP and 180°OOP tests. Isothermal tests have also been carried out for comparison of crack growth rates at the point of peak stress in the TMF cycles.
published_date 2014-12-31T03:25:10Z
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score 11.013731

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