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Long Term Creep Life Prediction of New and Service Exposed P91 Steel

[+] Author Affiliations
Muneeb Ejaz, Norhaida Ab Razak, Catrin M. Davies

Imperial College London, London, UK

Andrew Morris

EDF Energy (UK), Gloucester, UK

Scott Lockyer

Uniper Technologies Limited, Nottingham, UK

Paper No. PVP2018-84314, pp. V06AT06A052; 6 pages
doi:10.1115/PVP2018-84314
From:
  • ASME 2018 Pressure Vessels and Piping Conference
  • Volume 6A: Materials and Fabrication
  • Prague, Czech Republic, July 15–20, 2018
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5167-8
  • Copyright © 2018 by ASME

abstract

P91 steels are widely used in high temperature components for power generation. Creep data is often generated through accelerated short term creep tests, for practical reasons, via increasing stress or temperature though this may alter the creep behaviour. Through normalising the creep test stress by tensile strength the Wilshire models reduce the batch to batch scatter in the creep data and enable the prediction of long term creep data from relatively short term test results. In this work it is shown that the Wilshire models fitted to uniaxial creep rupture data can be used to predict failure in both as cast and service exposed multiaxial tests. This is provided that the equivalent stress is the rupture controlling stress, as is the case for the P91 tests examined, and the tensile strength is measured as part of the test programme.

Copyright © 2018 by ASME
Topics: Creep , Steel

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