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Prediction of Stress Relaxation in Power Plant Components Based on a Constitutive Model

[+] Author Affiliations
Y. Kostenko

Siemens AG, Muelheim, Germany

K. Naumenko

Otto-von-Guericke University, Magdeburg, Germany

Paper No. GT2017-63608, pp. V008T29A017; 8 pages
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 8: Microturbines, Turbochargers and Small Turbomachines; Steam Turbines
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5095-4
  • Copyright © 2017 by Siemens Energy, Inc.


Many power plant components and joint connections are subjected to complex thermo-mechanical loading paths under severe temperature environments over a long period. An important part in the lifetime assessment is the reliable prediction of stress relaxation using improved creep modeling to avoid possible integrity or functionality issues and malfunction in such components.

The aim of this work is to analyze the proposed constitutive model for advanced high chromium steels with the goal of predicting stress relaxation over the long term. The evolution equations of the constitutive model for inelastic material behavior are introduced to account for hardening and softening phenomena. The material properties were identified for 9–12%CrMoV steels in the creep range.

The model is applied to the stress relaxation analysis of power plant components. The results for long-term assessment, which are encouragingly close to reality, will be presented and discussed. An outlook on further developments of the model and assessment procedure is also provided.

Copyright © 2017 by Siemens Energy, Inc.



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