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The Relative Importance of Creep Hardening, Softening, and Damage in the Determination of Creep Failure Using a Monkman–Grant-Type Relation Derived Within the 4-θ Methodology

Mark Evans

Metallurgical and Materials Transactions A

Swansea University Author: Mark Evans

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DOI (Published version): 10.1007/s11661-025-07905-2

Abstract

An analysis of minimum creep rates vs. time to failure is a suggested approach to the evaluationof long-term creep rupture. But this requires constancy of this relation over all test conditions.This paper therefore used the 4-h methodology to study in more detail the role of creepmechanisms in deter...

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Published in: Metallurgical and Materials Transactions A
ISSN: 1073-5623 1543-1940
Published: Springer Science and Business Media LLC 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa69952
Abstract: An analysis of minimum creep rates vs. time to failure is a suggested approach to the evaluationof long-term creep rupture. But this requires constancy of this relation over all test conditions.This paper therefore used the 4-h methodology to study in more detail the role of creepmechanisms in determining the nature of this relationship and from this, the stability of therelationship. It was found that the Monkman–Grant constant depended negatively on the rateof damage accumulation, the initial strain rate, and the rate of hardening, but positively on thestrain at failure. It was also found that at 833 K and a high stress, h4 was the major determinantof failure times. But as the stress level fell, the parameters h3 and h1 become more important.The growing importance of h3 with decreasing stress implies a bigger role for damageaccumulation with decreasing stress (as ^W =1/h3). At the highest stress, the rate of softeningwas the biggest contributor to variations in failure time but with decreasing stress, damageaccumulation and hardening play a bigger role in determining the variation in failure times.
College: Faculty of Science and Engineering
Funders: Swansea University

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