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Investigations on the lifetime behaviour of a P23 pipe under fatigue loading

: Friedmann, V.; Hartrott, P. von

Staatliche Materialprüfungsanstalt -MPA-, Stuttgart; Univ. Stuttgart, Institut für Werkzeugmaschinen -IFW-; National Institute for Materials Science -NIMS-:
34. MPA-Seminar und VGB-Fachtagung "Werkstoff- & Bauteilverhalten in der Energie- & Anlagentechnik" 2008. CD-ROM : In Verbindung mit dem MPA-IfW-NIMS-Workshop "Advanced in High-Temperature Materials for Future High Efficiency Power Plants" am 9. und 10. Oktober 2008 in Stuttgart
Stuttgart: Materialprüfungsanstalt Universität Stuttgart (MPA Stuttgart, Otto-Graf-Institut (FMPA)), 2008
MPA-Seminar <34, 2008, Stuttgart>
Fachtagung "Werkstoff- & Bauteilverhalten in der Energie- & Anlagentechnik" <2008, Stuttgart>
Workshop "Advanced in High-Temperature Materials for Future High Efficiency Power Plants" <2008, Stuttgart>
Conference Paper
Fraunhofer IWM ()
P23 weld; component test; LCF; modelling; DTMF-parameter; component simulation; lifetime

The performance of girth welds on new P23 low chromium steel pipes under cyclic loading at 450°C was investigated. The loading conditions were chosen to be representative for bore crack initiation and growth observed in main steam lines fabricated of 0.5Cr0.5Mo0.25V (CrMoV) steel. The microstructure of the base material and weldments was analysed. A lifetime model, initially set up for the prediction of thermo-cyclic loading, is used to predict the isothermal component behaviour. It is based on a Chaboche-type deformation model and the DTMF crack growth mode. The failure mechanism of two component tests was compared to the model assumptions and the component lifetimes and failure locations are compared to the model preditions.