期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 47, 期 -, 页码 115-125出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2012.07.016
关键词
Creep-fatigue; Microstructures; Intergranular fracture; High temperature fatigue; Crack paths
资金
- NSF MRI Grant [DMR-0521315]
- US Department of Energy - Nuclear Energy
Alloy 617 is the leading candidate material for an Intermediate Heat Exchanger (IHX) of the Very High Temperature Reactor (VHTR). To evaluate the behavior of this material in the expected service conditions, strain-controlled cyclic tests that include hold times up to 9000 s at maximum tensile strain were conducted at 950 degrees C. The fatigue resistance decreased when a hold time was added at peak tensile strain, owing to the mechanisms resulting in a change in fracture mode from transgranular in pure fatigue to intergranular in creep-fatigue. Increases in the tensile hold duration beyond an initial value were not detrimental to the creep-fatigue resistance. An analysis of the evolving failure modes was facilitated by interrupting tests during cycling for ex situ microstructural investigation. (C) 2012 Elsevier Ltd. All rights reserved.
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