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High temperature, low cycle fatigue characterization of P91 weld and heat affected zone material

Farragher, T.P.; Scully, S.; O'Dowd, N.P.; Hyde, Christopher J.; Leen, S.B.


T.P. Farragher

S. Scully

N.P. O'Dowd

Christopher J. Hyde

S.B. Leen


The high temperature low cycle fatigue behavior of P91 weld metal (WM) and weld joints (cross-weld) is presented. Strain-controlled tests have been carried out at 400 °C and 500 °C. The cyclic behavior of the weld material (WM) and cross-weld (CW) specimens are compared with previously published base material (BM) tests. The weld material is shown to give a significantly harder and stiffer stress–strain response than both the base material and the cross-weld material. The cross-weld tests exhibited a cyclic stress–strain response, which was similar to that of the base material. All specimen types exhibited cyclic softening but the degree of softening exhibited by the cross-weld specimens was lower than that of the base material and all-weld tests. Finite element models of the base metal, weld metal and cross-weld test specimens are developed and employed for identification of the cyclic viscoplasticity material parameters. Heat affected zone (HAZ) cracking was observed for the cross-weld tests.

Journal Article Type Article
Publication Date Apr 1, 2014
Journal Journal of Pressure Vessel Technology
Print ISSN 0094-9930
Electronic ISSN 1528-8978
Publisher American Society of Mechanical Engineers
Peer Reviewed Peer Reviewed
Volume 136
Issue 2
Article Number 021403
APA6 Citation Farragher, T., Scully, S., O'Dowd, N., Hyde, C. J., & Leen, S. (2014). High temperature, low cycle fatigue characterization of P91 weld and heat affected zone material. Journal of Pressure Vessel Technology, 136(2), doi:10.1115/1.4025943
Publisher URL
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information Paper No: PVT-13-1088