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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 a 1CrMoV rotor steel

Mark Evans

International Journal of Pressure Vessels and Piping, Volume: 218, Issue: Part B, Start page: 105627

Swansea University Author: Mark Evans

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DOI (Published version): 10.1016/j.ijpvp.2025.105627

Abstract

It is important to be able to predict the life of materials at high temperatures and 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...

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Published in: International Journal of Pressure Vessels and Piping
ISSN: 0308-0161 1879-3541
Published: Elsevier BV 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa70218
Abstract: It is important to be able to predict the life of materials at high temperatures and 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 was 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. Only once such a grouping is undertaken does the relation accurately predicted lives close to operating conditions.
Keywords: Low chrome steels; Monkman-Grant relation; 4-θ methodology; Damage; Rates of damage accumulation; Recovery; Hardening
College: Faculty of Science and Engineering
Funders: Swansea University
Issue: Part B
Start Page: 105627

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