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Testing Model Structure Through a Unification of Some Modern Parametric Models of Creep: An Application to 316H Stainless Steel

Mark Evans Orcid Logo

Metallurgical and Materials Transactions A, Volume: 51, Issue: 2, Pages: 697 - 707

Swansea University Author: Mark Evans Orcid Logo

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DOI (Published version): 10.1007/s11661-019-05540-2

Abstract

It is important to be able to predict the creep life of materials used in power plants and in aeroengines. This paper develops a new parametric creep model that extends those put forward by Wilshire and Yang et al. by having them as restricted or special cases of a new generalized model. When this g...

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Published in: Metallurgical and Materials Transactions A
ISSN: 1073-5623 1543-1940
Published: Springer Science and Business Media LLC 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa52545
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first_indexed 2019-10-22T13:03:18Z
last_indexed 2020-09-06T03:15:36Z
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spelling 2020-09-05T15:26:29.5738535 v2 52545 2019-10-22 Testing Model Structure Through a Unification of Some Modern Parametric Models of Creep: An Application to 316H Stainless Steel 7720f04c308cf7a1c32312058780d20c 0000-0003-2056-2396 Mark Evans Mark Evans true false 2019-10-22 MTLS It is important to be able to predict the creep life of materials used in power plants and in aeroengines. This paper develops a new parametric creep model that extends those put forward by Wilshire and Yang et al. by having them as restricted or special cases of a new generalized model. When this generalized model was applied to failure time data on 316H stainless steel it was found that neither of these established parametric models explained the greatest variation in the experimentally obtained times to failure. Instead, a version of this generalized model was most compatible with the experimental data. It was further found that the activation energy for this material changed at a normalized stress of 0.41 due to a change from the domination of dislocation movement within grains to movement within grain boundaries. Finally, when the generalized model was used to predict failure times beyond 5000 hours (using only the shorter test times), the new generalized model had better predictive capability at most temperatures. Journal Article Metallurgical and Materials Transactions A 51 2 697 707 Springer Science and Business Media LLC 1073-5623 1543-1940 1 2 2020 2020-02-01 10.1007/s11661-019-05540-2 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-09-05T15:26:29.5738535 2019-10-22T11:35:02.5243846 Mark Evans 0000-0003-2056-2396 1 52545__16491__4ee4bf69f89842c98e8876727e7c2ff9.pdf 52545.pdf 2020-01-30T16:54:36.7634369 Output 512873 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution 4.0 International License (CC-BY). true eng http://creativecommons.org/licenses/by/4.0/
title Testing Model Structure Through a Unification of Some Modern Parametric Models of Creep: An Application to 316H Stainless Steel
spellingShingle Testing Model Structure Through a Unification of Some Modern Parametric Models of Creep: An Application to 316H Stainless Steel
Mark Evans
title_short Testing Model Structure Through a Unification of Some Modern Parametric Models of Creep: An Application to 316H Stainless Steel
title_full Testing Model Structure Through a Unification of Some Modern Parametric Models of Creep: An Application to 316H Stainless Steel
title_fullStr Testing Model Structure Through a Unification of Some Modern Parametric Models of Creep: An Application to 316H Stainless Steel
title_full_unstemmed Testing Model Structure Through a Unification of Some Modern Parametric Models of Creep: An Application to 316H Stainless Steel
title_sort Testing Model Structure Through a Unification of Some Modern Parametric Models of Creep: An Application to 316H Stainless Steel
author_id_str_mv 7720f04c308cf7a1c32312058780d20c
author_id_fullname_str_mv 7720f04c308cf7a1c32312058780d20c_***_Mark Evans
author Mark Evans
author2 Mark Evans
format Journal article
container_title Metallurgical and Materials Transactions A
container_volume 51
container_issue 2
container_start_page 697
publishDate 2020
institution Swansea University
issn 1073-5623
1543-1940
doi_str_mv 10.1007/s11661-019-05540-2
publisher Springer Science and Business Media LLC
document_store_str 1
active_str 0
description It is important to be able to predict the creep life of materials used in power plants and in aeroengines. This paper develops a new parametric creep model that extends those put forward by Wilshire and Yang et al. by having them as restricted or special cases of a new generalized model. When this generalized model was applied to failure time data on 316H stainless steel it was found that neither of these established parametric models explained the greatest variation in the experimentally obtained times to failure. Instead, a version of this generalized model was most compatible with the experimental data. It was further found that the activation energy for this material changed at a normalized stress of 0.41 due to a change from the domination of dislocation movement within grains to movement within grain boundaries. Finally, when the generalized model was used to predict failure times beyond 5000 hours (using only the shorter test times), the new generalized model had better predictive capability at most temperatures.
published_date 2020-02-01T04:04:58Z
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score 11.01628

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