Abstract
The current ASME Boiler and Pressure Vessel (B&PV) Code Section III, Division 5, Subsection HB, Subpart B has only one design fatigue curve for grade 91 steel (Gr. 91) at 540 oC (or 1000 oF). The ASME Section III Working Group on Creep-Fatigue and Negligible Creep (WG-CFNC) has taken an action to incorporate the temperature-dependent design fatigue curves for Gr. 91 developed by Japan Society of Mechanical Engineers (JSME) into ASME Section III Division 5. During the process, issues regarding the effect of mean stress on fatigue analysis, and how to consider the mean stress effect for elevated-temperature design, were brought up. To evaluate whether the design fatigue curves of Gr. 91 needed adjustment to account for mean stress, critical tests were designed and performed at 371 oC (700 oF) and 540 oC (1000 oF). This study is similar to the work performed on Alloy 617 when its fatigue design curves were established for temperature range of 538-704°C (1000-1300°F) as part of the Code Case package for Alloy 617 to be used as Class A construction material in Division 5. The effects of mean stress on Alloy 617 were evaluated at 550°C (1022°F). The results showed that the mean stresses introduced by the non-zero mean strain could not be maintained under strain-controlled fatigue and resulted in negligible effect on the fatigue life. Mean stress correction was not recommended for Alloy 617 fatigue design curves in Division 5. This study shows the same conclusion for Gr. 91.
Original language | English |
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Title of host publication | Codes and Standards |
Publisher | American Society of Mechanical Engineers (ASME) |
ISBN (Electronic) | 9780791883815 |
DOIs | |
State | Published - 2020 |
Event | ASME 2020 Pressure Vessels and Piping Conference, PVP 2020 - Virtual, Online Duration: Aug 3 2020 → … |
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 2020 Pressure Vessels and Piping Conference, PVP 2020 |
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City | Virtual, Online |
Period | 08/3/20 → … |
Funding
The research was sponsored by the U.S. Department of Energy, Office of Nuclear Energy, under Contract No. DE-AC02-06CH11357 with Argonne National Laboratory, managed and operated by UChicago Argonne LLC, under contract No. DE-AC05-00OR22725 with Oak Ridge National Laboratory (ORNL), managed and operated by UT-Battelle, LLC, and under contract No. DE-AC0500OR22725 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. DEAC02-06CH11357 with Argonne National Laboratory, managed and operated by UChicago Argonne LLC, under contract No. DE-AC05-00OR22725 with Oak Ridge National Laboratory (ORNL), managed and operated by UT-Battelle, LLC, and under contract No. DE-AC0500OR22725 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 UChicago Argonne LLC, under Contract No. DE-AC02-06CH11357, 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
- Elevated temperature
- Fatigue curves
- Mean stress correction