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dc.contributor.authorBarrett, Richard A.
dc.contributor.authorO'Donoghue, Peter E.
dc.contributor.authorLeen, Sean B.
dc.identifier.citationBarrett, RA, O Donoghue, PE, Leen, SB (2015) 'A dislocation-based model for high temperature cyclic viscoplasticity of 9-12Cr steels'. Journal Of Pressure Vessel Technology, .en_IE
dc.descriptionJournal articleen_IE
dc.description.abstractA dislocation-based model for high temperature cyclic viscoplasticity in 9–12Cr steels is presented. This model incorporates (i) cyclic softening via decrease in overall dislocation density, loss of low angle boundary dislocations and coarsening of the microstructure and (ii) kinematic hardening via precipitate strengthening and dislocation substructure hardening. The effects of the primary micro-structural variables, viz. precipitate radii, dislocation density and martensitic lath width on cyclic viscoplasticity, reveal a size effect of initial precipitate radii and volume fraction, with smaller radii and a higher density of precipitate producing a stronger material. A similar effect is also predicted for initial martensitic lath width at temperatures below 500 °C. The model is intended for microstructure sensitive design of high temperature materials and components for next generation power plant technology.en_IE
dc.description.sponsorshipScience Foundation Ireland - Grant # SFI/10/IN.1/I3015en_IE
dc.publisherElsevier ScienceDirecten_IE
dc.relation.ispartofJournal Of Pressure Vessel Technologyen
dc.subjectP91 steelen_IE
dc.subjectDislocation densityen_IE
dc.subjectPrecipitate hardeningen_IE
dc.subjectCyclic softeningen_IE
dc.subjectCyclic viscoplasticityen_IE
dc.titleA dislocation-based model for high temperature cyclic viscoplasticity of 9-12Cr steelsen_IE
dc.local.contactSean Leen, Mechanical & Biomedical Eng, Eng-2051, New Engineering Building, Nui Galway. 5955 Email:

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