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The role of primary and tertiary creep in defining the form of the Monkman-Grant relation using the 4-θ methodology: An application to 12Cr-Mo-V-Nb steel

Mark Evans

Materials Science and Technology

Swansea University Author: Mark Evans

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DOI (Published version): 10.1177/02670836251382481

Abstract

It is important to be able to predict the life of materials at high temperatures. The Monkman-Grant relation offers potential for reducing the development cycle for new materials. This paper uses the 4-θ methodology to i. identify and explain the form of this relation in terms of creep mechanisms an...

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Published in: Materials Science and Technology
ISSN: 0267-0836 1743-2847
Published: SAGE Publications 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa70340
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spelling 2026-02-05T16:04:19.8023461 v2 70340 2025-09-12 The role of primary and tertiary creep in defining the form of the Monkman-Grant relation using the 4-θ methodology: An application to 12Cr-Mo-V-Nb steel 7720f04c308cf7a1c32312058780d20c Mark Evans Mark Evans true false 2025-09-12 It is important to be able to predict the life of materials at high temperatures. The Monkman-Grant relation offers potential for reducing the development cycle for new materials. This paper uses the 4-θ methodology to i. identify and explain the form of this relation in terms of creep mechanisms and ii. to discover whether this form is compatible with development cycle reduction. The Monkman-Grant proportionality constant (M2) was found to fall into three groupings depending on the amount of damage and the rate at which this occurred. Only once this was considered did the exponent on the secondary creep rate equal −1 – as predicted by 4-θ methodology. One of these groupings might be relevant for longer term life assessment. Journal Article Materials Science and Technology 0 SAGE Publications 0267-0836 1743-2847 Monkman-Grant relation, 4-θ methodology, damage, rates of damage accumulation, recovery, hardening 29 9 2025 2025-09-29 10.1177/02670836251382481 COLLEGE NANME COLLEGE CODE Swansea University SU Library paid the OA fee (TA Institutional Deal) Swansea University 2026-02-05T16:04:19.8023461 2025-09-12T09:27:32.6790520 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Mark Evans 1 70340__35437__f7b0eb7c2a7b406e93f645ee5f30102d.pdf 70340.VOR.pdf 2025-10-22T10:42:13.3938838 Output 2269979 application/pdf Version of Record true © The Author(s) 2025. This article is distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY 4.0). true eng https://creativecommons.org/licenses/by/4.0/
title The role of primary and tertiary creep in defining the form of the Monkman-Grant relation using the 4-θ methodology: An application to 12Cr-Mo-V-Nb steel
spellingShingle The role of primary and tertiary creep in defining the form of the Monkman-Grant relation using the 4-θ methodology: An application to 12Cr-Mo-V-Nb steel
Mark Evans
title_short The role of primary and tertiary creep in defining the form of the Monkman-Grant relation using the 4-θ methodology: An application to 12Cr-Mo-V-Nb steel
title_full The role of primary and tertiary creep in defining the form of the Monkman-Grant relation using the 4-θ methodology: An application to 12Cr-Mo-V-Nb steel
title_fullStr The role of primary and tertiary creep in defining the form of the Monkman-Grant relation using the 4-θ methodology: An application to 12Cr-Mo-V-Nb steel
title_full_unstemmed The role of primary and tertiary creep in defining the form of the Monkman-Grant relation using the 4-θ methodology: An application to 12Cr-Mo-V-Nb steel
title_sort The role of primary and tertiary creep in defining the form of the Monkman-Grant relation using the 4-θ methodology: An application to 12Cr-Mo-V-Nb 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 Materials Science and Technology
container_volume 0
publishDate 2025
institution Swansea University
issn 0267-0836
1743-2847
doi_str_mv 10.1177/02670836251382481
publisher SAGE Publications
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
active_str 0
description It is important to be able to predict the life of materials at high temperatures. The Monkman-Grant relation offers potential for reducing the development cycle for new materials. This paper uses the 4-θ methodology to i. identify and explain the form of this relation in terms of creep mechanisms and ii. to discover whether this form is compatible with development cycle reduction. The Monkman-Grant proportionality constant (M2) was found to fall into three groupings depending on the amount of damage and the rate at which this occurred. Only once this was considered did the exponent on the secondary creep rate equal −1 – as predicted by 4-θ methodology. One of these groupings might be relevant for longer term life assessment.
published_date 2025-09-29T05:31:11Z
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score 11.09611

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