Characterization of thermal aging effects on the creep performance of T91 using small punch creep testing

Cathal Ó'Murchú; Seán B. Leen; Padraic E. O'Donoghue; Richard A. Barrett

doi:10.1111/ffe.13471

Characterization of thermal aging effects on the creep performance of T91 using small punch creep testing

Cathal Ó'Murchú
, Seán B. Leen
, Padraic E. O'Donoghue
, Richard A. Barrett

University of Galway

Research output: Contribution to a Journal (Peer & Non Peer) › Article › peer-review

2 Citations (Scopus)

Abstract

This paper is concerned with the development and application of a small punch creep testing method for assessment of the effects of thermal aging and associated precipitate coarsening on the high temperature creep life and deformation behavior of a 9Cr ferritic–martensitic steel. The tests are conducted on P91 steel, for both aged (up to 1 year) and unaged specimens, at temperatures of 600°C. The unaged test results are shown to be consistent with previously published creep tensile test rupture life data in terms of Chakrabarty membrane stress. Aging is shown to have a significant, detrimental effect on creep life and deformation rate. The steady-state displacement rate, time to failure, and displacement at failure data, for both aged and unaged, were successfully correlated via the modified Monkman–Grant relationship.

Original language	English
Pages (from-to)	2000-2014
Number of pages	15
Journal	Fatigue and Fracture of Engineering Materials and Structures
Volume	44
Issue number	8
DOIs	https://doi.org/10.1111/ffe.13471
Publication status	Published - Aug 2021

Keywords

9Cr steel
aging
damage mechanics
precipitates
small punch creep

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10.1111/ffe.13471

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title = "Characterization of thermal aging effects on the creep performance of T91 using small punch creep testing",

abstract = "This paper is concerned with the development and application of a small punch creep testing method for assessment of the effects of thermal aging and associated precipitate coarsening on the high temperature creep life and deformation behavior of a 9Cr ferritic–martensitic steel. The tests are conducted on P91 steel, for both aged (up to 1 year) and unaged specimens, at temperatures of 600°C. The unaged test results are shown to be consistent with previously published creep tensile test rupture life data in terms of Chakrabarty membrane stress. Aging is shown to have a significant, detrimental effect on creep life and deformation rate. The steady-state displacement rate, time to failure, and displacement at failure data, for both aged and unaged, were successfully correlated via the modified Monkman–Grant relationship.",

keywords = "9Cr steel, aging, damage mechanics, precipitates, small punch creep",

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note = "Publisher Copyright: {\textcopyright} 2021 The Authors. Fatigue \& Fracture of Engineering Materials \& Structures published by John Wiley \& Sons Ltd.",

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T1 - Characterization of thermal aging effects on the creep performance of T91 using small punch creep testing

AU - Ó'Murchú, Cathal

AU - Leen, Seán B.

AU - O'Donoghue, Padraic E.

AU - Barrett, Richard A.

PY - 2021/8

Y1 - 2021/8

N2 - This paper is concerned with the development and application of a small punch creep testing method for assessment of the effects of thermal aging and associated precipitate coarsening on the high temperature creep life and deformation behavior of a 9Cr ferritic–martensitic steel. The tests are conducted on P91 steel, for both aged (up to 1 year) and unaged specimens, at temperatures of 600°C. The unaged test results are shown to be consistent with previously published creep tensile test rupture life data in terms of Chakrabarty membrane stress. Aging is shown to have a significant, detrimental effect on creep life and deformation rate. The steady-state displacement rate, time to failure, and displacement at failure data, for both aged and unaged, were successfully correlated via the modified Monkman–Grant relationship.

AB - This paper is concerned with the development and application of a small punch creep testing method for assessment of the effects of thermal aging and associated precipitate coarsening on the high temperature creep life and deformation behavior of a 9Cr ferritic–martensitic steel. The tests are conducted on P91 steel, for both aged (up to 1 year) and unaged specimens, at temperatures of 600°C. The unaged test results are shown to be consistent with previously published creep tensile test rupture life data in terms of Chakrabarty membrane stress. Aging is shown to have a significant, detrimental effect on creep life and deformation rate. The steady-state displacement rate, time to failure, and displacement at failure data, for both aged and unaged, were successfully correlated via the modified Monkman–Grant relationship.

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KW - aging

KW - damage mechanics

KW - precipitates

KW - small punch creep

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DO - 10.1111/ffe.13471

M3 - Article

SN - 8756-758X

VL - 44

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JO - Fatigue and Fracture of Engineering Materials and Structures

JF - Fatigue and Fracture of Engineering Materials and Structures

IS - 8

ER -

Characterization of thermal aging effects on the creep performance of T91 using small punch creep testing

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Keywords

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