Creep-damage evaluation of modified 9Cr-1Mo steel based on a time-fraction concept
- Toshiba Corp., Yokohama (Japan). Nuclear Engineering Lab.
- Japan Atomic Power Co., Tokyo (Japan). Fast Breeder Reactor Development Dept.
- Mitsubishi Heavy Industries, Ltd., Takasago (Japan). Takasago Research and Development Center
- Hitachi, Ltd. (Japan). Advanced Reactor and Nuclear Fuel Cycle Dept.
In the elevated-temperature design guide (DDS) for the Japanese demonstration fast breeder reactor (DFBR), a time-fraction concept is applied to creep-damage evaluation based on an analytical stress-relaxation behavior calculated from the creep properties. Modified 9Cr-1Mo steel is the most likely structural material for the steam generator of the DFBR. For this material, the creep damage calculated by the conventional time-fraction rule based on the experimental stress-relaxation behavior was inappropriately small in previous studies. The authors reported that the time-fraction approach modified by the creep properties after cyclic softening is able to evaluate creep damage fairly well. In this paper, the time-fraction concept based on the analytical stress-relaxation behavior with the cyclic stress strain relation (the DDS approach) is applied to the evaluation of creep-fatigue test results, demonstrating that the DDS approach can suitably estimate the creep damage. It is also shown that the DDS approach can approximately match the creep damage as calculated based on the creep strength after cyclic softening.
- OSTI ID:
- 136870
- Report Number(s):
- CONF-950740-; ISBN 0-7918-1344-4; TRN: 96:000975
- Resource Relation:
- Conference: Joint American Society of Mechanical Engineers (ASME)/Japan Society of Mechanical Engineers (JSME) pressure vessels and piping conference, Honolulu, HI (United States), 23-27 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of International pressure vessels and piping codes and standards. Volume 2: Current perspectives; PVP-Volume 313-2; Rao, K.R.; Asada, Yasuhide; Adams, T.M. [eds.] [and others]; PB: 505 p.
- Country of Publication:
- United States
- Language:
- English
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