期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 124, 期 -, 页码 205-216出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2019.02.037
关键词
Alloy 709; Creep-fatigue; Microstructure evolution; Time-dependent deformation; Dynamic strain aging
资金
- U.S. Department of Energy (DOE) Nuclear Energy University Program (NEUP) [15-8548]
Alloy 709 is a leading candidate structural material for sodium-cooled fast spectrum reactors (FSR), where creepfatigue is a potential failure mode. Low cycle fatigue (LCF) and creep-fatigue tests with 30 min tensile hold times have been conducted to failure at 550 and 650 degrees C, corresponding to potential service and accelerated test temperatures, respectively. Creep-fatigue life is reduced relative to LCF at both temperatures, though significantly more at 550 degrees C compared to 650 degrees C. Differences in slip behavior, dynamic recovery, precipitate evolution, and strain-aging effects result in less stress relaxation and sustained high tensile stresses in creep-fatigue at 550 degrees C; thus, there is more intergranular damage compared to 650 degrees C.
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