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High Temperature, Low Cycle Fatigue Characterisation of P91 Weld and Heat Affected Zone Material

T. P. Farragher, S. Scully, N. P. O'Dowd, S. B. Leen
2013 Volume 6A: Materials and Fabrication   unpublished

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The high temperature low cycle fatigue behaviour of P91 weld metal (WM) and weld joints (cross-weld) is presented. Strain-controlled tests have been carried out at 400 o C and 500 o C. The cyclic behaviour 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
more » ... hibited 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 crossweld tests.
doi:10.1115/pvp2013-97996 fatcat:joiiaj5wdvgyzaf2fxn74and6u
Citation

T. P. Farragher, S. Scully, N. P. O'Dowd, S. B. Leen. "High Temperature, Low Cycle Fatigue Characterisation of P91 Weld and Heat Affected Zone Material." Volume 6A: Materials and Fabrication (2013)