The most important failure mode to be prevented is creep-fatigue at elevated temperatures in fast reactors. 316FR stainless steel is a candidate material for the reactor vessel and internal structures. A method to evaluate creep-fatigue life, based on the time fraction rule, has been already developed in base metal of 316FR stainless steel. Development of procedure in evaluating creep-fatigue life is also necessary for the weldment of 316FR stainless steel by similar fillers or 16-8-2 fillers. Compared between mechanical properties of weldment and those of base metal, strength-reduction factors for weldment have been evaluated. Strength-reduction factor for fatigue has been proposed. It is considered that strength-reduction factor for creep strength is not necessary. Creepfatigue life could be evaluated in the same way for weldments of similar fillers and 16-8-2 fillers, because a difference in mechanical properties between both filler metals is negligible. Creep-fatigue life by the time fraction rule using analytical relaxation curve for weldments were compared with experimental data, and a method to evaluate creep-fatigue life for the weldments of 316FR stainless steel has been proposed.
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ASME 2015 Pressure Vessels and Piping Conference
July 19–23, 2015
Boston, Massachusetts, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5699-4
PROCEEDINGS PAPER
Evaluation Method of Creep-Fatigue Life for 316FR Weldment
Yuji Nagae,
Yuji Nagae
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
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Kenji Yamamoto,
Kenji Yamamoto
Mitsubishi Heavy Industries, Takasago, Hyogo, Japan
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Tomomi Otani
Tomomi Otani
Mitsubishi FBR Systems, Tokyo, Japan
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Yuji Nagae
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
Kenji Yamamoto
Mitsubishi Heavy Industries, Takasago, Hyogo, Japan
Tomomi Otani
Mitsubishi FBR Systems, Tokyo, Japan
Paper No:
PVP2015-45513, V06AT06A051; 7 pages
Published Online:
November 19, 2015
Citation
Nagae, Y, Yamamoto, K, & Otani, T. "Evaluation Method of Creep-Fatigue Life for 316FR Weldment." Proceedings of the ASME 2015 Pressure Vessels and Piping Conference. Volume 6A: Materials and Fabrication. Boston, Massachusetts, USA. July 19–23, 2015. V06AT06A051. ASME. https://doi.org/10.1115/PVP2015-45513
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