Skip to main content

Research Repository

Advanced Search

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.


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), Article 021403.

Journal Article Type Article
Acceptance Date Oct 16, 2013
Online Publication Date Jan 8, 2014
Publication Date Apr 1, 2014
Deposit Date Sep 19, 2017
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
Public URL
Publisher URL
Additional Information Paper No: PVT-13-1088