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Incorporating specific batch characteristics such as chemistry, heat treatment, hardness and grain size into the Wilshire equations for safe life prediction in high temperature applications: An application to 12Cr stainless steel...

Mark Evans Orcid Logo

Applied Mathematical Modelling, Volume: 40, Issue: 23-24, Pages: 10342 - 10359

Swansea University Author: Mark Evans Orcid Logo

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DOI (Published version): 10.1016/j.apm.2016.07.013

Abstract

A modified version of the Wilshire equation was proposed to incorporate specific batch characteristics such as chemistry, heat treatment, hardness and grain size into the analysis of times to failure at high temperatures. A new two stage estimation procedure was proposed for obtaining values for the...

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Published in: Applied Mathematical Modelling
ISSN: 0307-904X
Published: 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa29506
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first_indexed 2016-08-09T12:53:14Z
last_indexed 2021-01-07T03:46:11Z
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spelling 2021-01-06T11:25:29.9139360 v2 29506 2016-08-09 Incorporating specific batch characteristics such as chemistry, heat treatment, hardness and grain size into the Wilshire equations for safe life prediction in high temperature applications: An application to 12Cr stainless steel bars for turbine blades 7720f04c308cf7a1c32312058780d20c 0000-0003-2056-2396 Mark Evans Mark Evans true false 2016-08-09 MTLS A modified version of the Wilshire equation was proposed to incorporate specific batch characteristics such as chemistry, heat treatment, hardness and grain size into the analysis of times to failure at high temperatures. A new two stage estimation procedure was proposed for obtaining values for the parameters of this modified Wilshire equation. This procedure overcomes the degrees of freedom obstacle present in extending the Wilshire equation is this direction: namely the small number of batches available in many creep data sets with which to investigate a large number of variables defining specific batch characteristics. Just a few batch characteristics were shown to be good predictors of the unknown parameters of the Wilshire equations – namely the P, Mn and Cu content of the batch, the batches hardness and some types of heat treatment. Incorporating these characteristics into the Wilshire equation produced safe life predictions which were more meaningful to specific batches of a 12Cr stainless steel alloy in that the median predictions were more representative of a particular batch data and the 0.5 - 99.5 percentile bands were much narrower and so the lower bound provided a more economically feasible safe life. The modification should allow for the more reliable safe life determination of specific batches actually being used by, for example, power generating companies. Journal Article Applied Mathematical Modelling 40 23-24 10342 10359 0307-904X 31 12 2016 2016-12-31 10.1016/j.apm.2016.07.013 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2021-01-06T11:25:29.9139360 2016-08-09T09:47:08.4986184 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Mark Evans 0000-0003-2056-2396 1 0029506-09082016142226.pdf evans2016.pdf 2016-08-09T14:22:26.8430000 Output 1048770 application/pdf Accepted Manuscript true 2017-07-27T00:00:00.0000000 true
title Incorporating specific batch characteristics such as chemistry, heat treatment, hardness and grain size into the Wilshire equations for safe life prediction in high temperature applications: An application to 12Cr stainless steel bars for turbine blades
spellingShingle Incorporating specific batch characteristics such as chemistry, heat treatment, hardness and grain size into the Wilshire equations for safe life prediction in high temperature applications: An application to 12Cr stainless steel bars for turbine blades
Mark Evans
title_short Incorporating specific batch characteristics such as chemistry, heat treatment, hardness and grain size into the Wilshire equations for safe life prediction in high temperature applications: An application to 12Cr stainless steel bars for turbine blades
title_full Incorporating specific batch characteristics such as chemistry, heat treatment, hardness and grain size into the Wilshire equations for safe life prediction in high temperature applications: An application to 12Cr stainless steel bars for turbine blades
title_fullStr Incorporating specific batch characteristics such as chemistry, heat treatment, hardness and grain size into the Wilshire equations for safe life prediction in high temperature applications: An application to 12Cr stainless steel bars for turbine blades
title_full_unstemmed Incorporating specific batch characteristics such as chemistry, heat treatment, hardness and grain size into the Wilshire equations for safe life prediction in high temperature applications: An application to 12Cr stainless steel bars for turbine blades
title_sort Incorporating specific batch characteristics such as chemistry, heat treatment, hardness and grain size into the Wilshire equations for safe life prediction in high temperature applications: An application to 12Cr stainless steel bars for turbine blades
author_id_str_mv 7720f04c308cf7a1c32312058780d20c
author_id_fullname_str_mv 7720f04c308cf7a1c32312058780d20c_***_Mark Evans
author Mark Evans
author2 Mark Evans
format Journal article
container_title Applied Mathematical Modelling
container_volume 40
container_issue 23-24
container_start_page 10342
publishDate 2016
institution Swansea University
issn 0307-904X
doi_str_mv 10.1016/j.apm.2016.07.013
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
document_store_str 1
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description A modified version of the Wilshire equation was proposed to incorporate specific batch characteristics such as chemistry, heat treatment, hardness and grain size into the analysis of times to failure at high temperatures. A new two stage estimation procedure was proposed for obtaining values for the parameters of this modified Wilshire equation. This procedure overcomes the degrees of freedom obstacle present in extending the Wilshire equation is this direction: namely the small number of batches available in many creep data sets with which to investigate a large number of variables defining specific batch characteristics. Just a few batch characteristics were shown to be good predictors of the unknown parameters of the Wilshire equations – namely the P, Mn and Cu content of the batch, the batches hardness and some types of heat treatment. Incorporating these characteristics into the Wilshire equation produced safe life predictions which were more meaningful to specific batches of a 12Cr stainless steel alloy in that the median predictions were more representative of a particular batch data and the 0.5 - 99.5 percentile bands were much narrower and so the lower bound provided a more economically feasible safe life. The modification should allow for the more reliable safe life determination of specific batches actually being used by, for example, power generating companies.
published_date 2016-12-31T03:35:53Z
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score 11.013731

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