Abstract
Creep-fatigue is the most severe damage mode for high temperate components under cyclic loading. Experimentally, standard creep-fatigue testing is mostly performed at strain ranges of 0.3% and above. There is a major data gap in creep-fatigue failure information for strain ranges at 0.3%, or lower, which are more prototypical for advanced reactor plant operations. To develop design curves for creep-fatigue evaluations, it will require a method for extrapolating the creep-fatigue cyclic lives to lower strain ranges and longer hold times. In this study, methods for creep-fatigue life prediction of Alloy 617 at lower strain ranges and longer hold times at 950°C were assessed. Two types of experimental data were generated to support the development of the creep-fatigue design curves at low strain ranges and long hold times. First, standard strain-controlled creep-fatigue testing using the concept of block-strain range was conducted to generate the information needed for extrapolating the creep-fatigue design curves to lower strain ranges and longer hold times. Second, creep-fatigue experiments with elastic follow-up were performed to failure to verify the proposed design curves. Based on this new testing approach and analysis method, a preliminary creep-fatigue design curve was developed for Alloy 617 at 950°C. This study shows the potential of generating a set of creep-fatigue design curves with different hold times within a reasonable amount of test times and testing effort at the low strain range region.
Original language | English |
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Title of host publication | Codes and Standards |
Publisher | American Society of Mechanical Engineers (ASME) |
ISBN (Electronic) | 9780791886144 |
DOIs | |
State | Published - 2022 |
Event | ASME 2022 Pressure Vessels and Piping Conference, PVP 2022 - Las Vegas, United States Duration: Jul 17 2022 → Jul 22 2022 |
Publication series
Name | American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP |
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Volume | 1 |
ISSN (Print) | 0277-027X |
Conference
Conference | ASME 2022 Pressure Vessels and Piping Conference, PVP 2022 |
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Country/Territory | United States |
City | Las Vegas |
Period | 07/17/22 → 07/22/22 |
Funding
The research was sponsored by the U.S. Department of Energy, Office of Nuclear Energy, under contract No. DEAC05-00OR22725 with Oak Ridge National Laboratory (ORNL), managed and operated by UT-Battelle, LLC, and under contract No. DE-AC07-05ID14517 with Idaho National Laboratory (INL), managed and operated by Battelle Energy Alliance, LLC. Programmatic direction was provided by the Office of Nuclear Reactor Deployment of the Office of Nuclear Energy. The research was sponsored by the U.S. Department of Energy, Office of Nuclear Energy, under contract No. DE-AC05-00OR22725 with Oak Ridge National Laboratory (ORNL), managed and operated by UT-Battelle, LLC, and under contract No. DE-AC07-05ID14517 with Idaho National Laboratory (INL), managed and operated by Battelle Energy Alliance, LLC. Programmatic direction was provided by the Office of Nuclear Reactor Deployment of the Office of Nuclear Energy. This manuscript has been co-authored by Battelle Energy Alliance, LLC, under Contract No. DE-AC07-05ID14517 and by UT-Battelle LLC, under Contract No. DE-AC0500OR22725, with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes.
Keywords
- Alloy 617
- Creep-fatigue damage
- Life prediction