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Assessment of potential service-life performance for MarBN steel power plant header under flexible thermomechanical operations

Type
Articles dans des revues avec comité de lecture
Author
LI, M.
407023 University of Nottingham, UK [UON]
BENAARBIA, Adil
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
MORRIS, A.
254304 EDF Energy R&D UK Centre
SUN, W.
407023 University of Nottingham, UK [UON]

URI
http://hdl.handle.net/10985/19569
DOI
10.1016/j.ijfatigue.2020.105565
Date
2020
Journal
International Journal of Fatigue

Abstract

This paper is concerned with the service-life assessment of 9Cr steels superheater outlet steam header subjected to realistic subcritical and future ultra-super critical flexible operating conditions. The proposed methodology is achieved via a combined program of high temperature strain-controlled fatigue tests, temperature- and time-dependent unified viscoplastic model for thermomechanical fatigue analysis, and Smith-Watson-Topper critical plane criterion for multi-axial life prediction. Samples of idealised operational transients with particular attention on the starting-up cycle is fully coupled with the computational modelling of header component for the high temperature performance assessment. The predicted results indicate that: (i) the header shell inner-bore saddles at weld regions are the critical locations that lead to earlier potential fatigue crack initiation, and (ii) the predicted lifetime under subcritical conditions correlates reasonably with the industrial experience. A steam header manufactured from MarBN operating under ultra-super critical condition is shown to have comparable life performance with the P91 header operating under subcritical condition.

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