Creep damage modelling of a P92 pipe weld at 675°C

Creep data from ferritic steel P92 parent material, weld metal, cross-weld and heat-affected zone specimens tested at 675°C are used to establish material behaviour models necessary for describing the creep behaviour of a P92 pipe with a circumferential weld.
The method for determining the material properties for the heat-affected zone of a P92 weld, in a single-state variable creep damage constitutive model, using the data from cross-weld and impression creep tests, is described. The material properties for the parent material and weld metal regions have been already been published.
Creep continuum damage finite-element analyses are subsequently performed for a P92 pipe containing a circumferential weld, subjected to internal pressure and end loading, in order to assess the high temperature integrity and failure behaviour of a typical power plant component, from which the lifetime and potential failure modes can be predicted.