Thermal-mechanical fatigue behaviour of 9-12% Cr power plant steels and pipes

W. Sun, David W J Tanner, T. H. Hyde, A. A. Saad

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

2 Citations (Scopus)


This paper is concerned with the thermal-mechanical fatigue
(TMF) behaviour of 9-12%Cr steels (P91 and P92) and of
steam pipes made from them. A unified visco-plasticity
model has been used in material behaviour characterization
(cyclic hardening and creep relaxation), using the data
obtained from iso-thermal and anisothermal experimental
testing. A method for determining the material properties has
been developed. The cyclic uniaxial test results have shown
the capability of the model, in representing the thermalmechanical responses of the materials. The material model
and the material properties obtained are then implemented
into the FE package ABAQUS (and Z-mat code) to model a
realistic main steam power plant pipe, using assumed plant
thermal and mechanical loading histories. The detailed
stresses and stress-strain loops within the pipe under the
thermal-mechanical conditions are investigated. The results
obtained will provide useful indication of possible crack
initiation sites and could form a basis for the development of
component lifing methodology under TMF conditions.
Original languageEnglish
Title of host publicationInternational Conference on Sustainable Electric Power Generation and Supply (SUPERGEN)
Place of PublicationHangzhou, China
PublisherInstitution of Engineering and Technology (IET)
Number of pages8
Publication statusPublished - 2012

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