The effects of precipitate coarsening on high temperature creep damage evolution in welded 9Cr steels

C. Murchú; S. B. Leen; P. E. O'Donoghue; R. A. Barrett

The effects of precipitate coarsening on high temperature creep damage evolution in welded 9Cr steels

C. Murchú, S. B. Leen, P. E. O'Donoghue, R. A. Barrett

University of Galway

Research output: Contribution to conference (Published) › Paper › peer-review

Abstract

A key mode of failure in high temperature power plant components is creep-induced Type IV cracking, which is associated with the inter-critical heat affected zone (HAZ). The decrease in creep strength is due, in part, to the coarser microstructure generated by the welding process. This paper focuses on modelling the loss of creep strength in a weldment of 9Cr steels due to altered precipitate volume fractions, initial diameters and obstacle spacing. A creep damage model, which explicitly includes the effects of strain- and temperature-induced coarsening for both M23C6 and MX precipitates, has been developed and is used here to investigate the effects on creep of a welded P91 test specimen.

Original language	English
Pages	227-228
Number of pages	2
Publication status	Published - 2017
Event	14th International Conference on Fracture, ICF 2017 - Rhodes, Greece Duration: 18 Jun 2017 → 20 Jun 2017

Conference

Conference	14th International Conference on Fracture, ICF 2017
Country/Territory	Greece
City	Rhodes
Period	18/06/17 → 20/06/17

Cite this

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title = "The effects of precipitate coarsening on high temperature creep damage evolution in welded 9Cr steels",

abstract = "A key mode of failure in high temperature power plant components is creep-induced Type IV cracking, which is associated with the inter-critical heat affected zone (HAZ). The decrease in creep strength is due, in part, to the coarser microstructure generated by the welding process. This paper focuses on modelling the loss of creep strength in a weldment of 9Cr steels due to altered precipitate volume fractions, initial diameters and obstacle spacing. A creep damage model, which explicitly includes the effects of strain- and temperature-induced coarsening for both M23C6 and MX precipitates, has been developed and is used here to investigate the effects on creep of a welded P91 test specimen.",

author = "C. Murch{\'u} and Leen, \{S. B.\} and O'Donoghue, \{P. E.\} and Barrett, \{R. A.\}",

note = "Publisher Copyright: {\textcopyright} 2017 Chinese Society of Theoretical and Applied Mechanics. All Rights Reserved.; 14th International Conference on Fracture, ICF 2017 ; Conference date: 18-06-2017 Through 20-06-2017",

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T1 - The effects of precipitate coarsening on high temperature creep damage evolution in welded 9Cr steels

AU - Murchú, C.

AU - Leen, S. B.

AU - O'Donoghue, P. E.

AU - Barrett, R. A.

PY - 2017

Y1 - 2017

N2 - A key mode of failure in high temperature power plant components is creep-induced Type IV cracking, which is associated with the inter-critical heat affected zone (HAZ). The decrease in creep strength is due, in part, to the coarser microstructure generated by the welding process. This paper focuses on modelling the loss of creep strength in a weldment of 9Cr steels due to altered precipitate volume fractions, initial diameters and obstacle spacing. A creep damage model, which explicitly includes the effects of strain- and temperature-induced coarsening for both M23C6 and MX precipitates, has been developed and is used here to investigate the effects on creep of a welded P91 test specimen.

AB - A key mode of failure in high temperature power plant components is creep-induced Type IV cracking, which is associated with the inter-critical heat affected zone (HAZ). The decrease in creep strength is due, in part, to the coarser microstructure generated by the welding process. This paper focuses on modelling the loss of creep strength in a weldment of 9Cr steels due to altered precipitate volume fractions, initial diameters and obstacle spacing. A creep damage model, which explicitly includes the effects of strain- and temperature-induced coarsening for both M23C6 and MX precipitates, has been developed and is used here to investigate the effects on creep of a welded P91 test specimen.

UR - http://www.scopus.com/inward/record.url?scp=85066052527&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:85066052527

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T2 - 14th International Conference on Fracture, ICF 2017

Y2 - 18 June 2017 through 20 June 2017

ER -

The effects of precipitate coarsening on high temperature creep damage evolution in welded 9Cr steels

Abstract

Conference

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