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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
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 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.
Keywords: Monkman-Grant relation, 4-θ methodology, damage, rates of damage accumulation, recovery, hardening
College: Faculty of Science and Engineering
Funders: Swansea University

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