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dc.contributor.authorMac Ardghail, Padraig
dc.contributor.authorHarrison, Noel
dc.contributor.authorLeen, Sean B.
dc.date.accessioned2019-11-29T09:23:17Z
dc.date.issued2019-04-30
dc.identifier.citationMac Ardghail, P., Harrison, N., & Leen, S. B. (2019). A process-structure-property model for welding of 9Cr power plant components: The influence of welding process temperatures on in-service cyclic plasticity response. International Journal of Pressure Vessels and Piping, 173, 26-44. doi: https://doi.org/10.1016/j.ijpvp.2019.04.015en_IE
dc.identifier.issn0308-0161
dc.identifier.urihttp://hdl.handle.net/10379/15585
dc.description.abstractA process-structure-property methodology is presented for welding of 9Cr steels under representative flexible operating conditions for a typical thermal power plant girth-welded pipe. The welding-induced evolution of microstructural variables is represented via (i) a solid-state phase transformation model for martensite-austenite transformation and (ii) empirical equations for prior austenite grain size, martensite lath width, hardness and M23C6 precipitate diameter and area fraction, calibrated from published heat treatment data. The temperature-dependent, physically-based, unified viscoplastic constitutive model, which includes a fatigue damage initiation criterion, is based on dislocation density evolution and is validated against high temperature cyclic plasticity data at a range of relevant temperatures for parent material P91, including combined isotropic-kinematic hardening effects. This model is shown to successfully predict weld-life reduction factor for cross-weld tests. The effects of key welding process variables on the microstructure gradient in the heat-affected zone, and associated thermo-mechanical, cyclic plasticity response are assessed. The inter-critical and fine-grained heat-affected zones are identified as the critical regions, consistent with observed plant experience. Increasing post-weld heat-treatment temperature from 760 degrees C to 780 degrees C is predicted to be detrimental due to increased precipitate coarsening. In contrast, increasing preheat and interpass temperature from 350 degrees C to 400 degrees C is predicted to be beneficial due to increased hardness in the critical regions.en_IE
dc.description.sponsorshipThis research is funded by Science Foundation Ireland grant numbers SFI/14/IA/2604 and SFI/16/RC/3872. The authors would like to acknowledge the contributors to this research; NUI Galway, the Ryan Institute, General Electric (UK), ESB International, University of Limerick, Imperial College London, I-Form, Ireland and Fraunhofer IWM, Freiburg. The authors would also like to thank Mr. S. Scully (ESB International) for supplying load-following plant temperature and pressure data for use in this work.en_IE
dc.formatapplication/pdfen_IE
dc.language.isoenen_IE
dc.publisherElsevieren_IE
dc.relation.ispartofInternational Journal Of Pressure Vessels And Pipingen
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Ireland
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/3.0/ie/
dc.subjectFINITE-ELEMENT SIMULATIONen_IE
dc.subjectRESIDUAL-STRESSESen_IE
dc.subjectSTEEL PIPEen_IE
dc.subjectP91 STEELen_IE
dc.subjectPHASE-TRANSFORMATIONen_IE
dc.subjectCREEP-BEHAVIORen_IE
dc.subjectFATIGUEen_IE
dc.subjectFAILUREen_IE
dc.subjectLIFEen_IE
dc.subjectIVen_IE
dc.titleA process-structure-property model for welding of 9Cr power plant components: The influence of welding process temperatures on in-service cyclic plasticity responseen_IE
dc.typeArticleen_IE
dc.date.updated2019-11-26T13:21:17Z
dc.identifier.doi10.1016/j.ijpvp.2019.04.015
dc.local.publishedsourcehttps://doi.org/10.1016/j.ijpvp.2019.04.015en_IE
dc.description.peer-reviewedpeer-reviewed
dc.contributor.funderScience Foundation Irelanden_IE
dc.description.embargo2021-04-30
dc.internal.rssid16715143
dc.local.contactSean Leen, Mechanical & Biomedical Eng, Eng-2051, New Engineering Building, Nui Galway. 5955 Email: sean.leen@nuigalway.ie
dc.local.copyrightcheckedYes
dc.local.versionACCEPTED
dcterms.projectinfo:eu-repo/grantAgreement/SFI/SFI Investigator Programme/14/IA/2604/IE/Multi-scale, Through-process Chracterisation for Innovative Manufacture of Next-generation Welded Connections (MECHANNICS)/en_IE
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Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Ireland