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.

Abstract

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.

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), Article 021403. https://doi.org/10.1115/1.4025943

• 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
• DOI: https://doi.org/10.1115/1.4025943
• Public URL: https://nottingham-repository.worktribe.com/output/996296
• Publisher URL: http://pressurevesseltech.asmedigitalcollection.asme.org/article.aspx?articleid=1770086
• Additional Information: Paper No: PVT-13-1088