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Title: Creep-Fatigue Behavior of Alloy 617 at 850 and 950°C, Revision 2

Abstract

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 including hold times up to 9000 s at maximum tensile strain were conducted at 850 and 950 degrees C. At both temperatures, the fatigue resistance decreased when a hold time was added at peak tensile strain. The magnitude of this effect depended on the specific mechanisms and whether they resulted in a change in fracture mode from transgranular in pure fatigue to intergranular in creep-fatigue for a particular temperature and strain range combination. Increases in the tensile hold duration beyond an initial value were not detrimental to the creep-fatigue resistance at 950 degrees C but did continue to degrade the lifetimes at 850 degrees C.

Authors:
 [1];  [1]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1202891
Report Number(s):
INL/EXT-13-28886
DOE Contract Number:  
AC07-05ID14517
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Alloy 617; creep-fatigue; IHX; microstructural evolution; VHTR

Citation Formats

Carroll, L., and Carroll, M. Creep-Fatigue Behavior of Alloy 617 at 850 and 950°C, Revision 2. United States: N. p., 2015. Web. doi:10.2172/1202891.
Carroll, L., & Carroll, M. Creep-Fatigue Behavior of Alloy 617 at 850 and 950°C, Revision 2. United States. doi:10.2172/1202891.
Carroll, L., and Carroll, M. Fri . "Creep-Fatigue Behavior of Alloy 617 at 850 and 950°C, Revision 2". United States. doi:10.2172/1202891. https://www.osti.gov/servlets/purl/1202891.
@article{osti_1202891,
title = {Creep-Fatigue Behavior of Alloy 617 at 850 and 950°C, Revision 2},
author = {Carroll, L. and Carroll, M.},
abstractNote = {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 including hold times up to 9000 s at maximum tensile strain were conducted at 850 and 950 degrees C. At both temperatures, the fatigue resistance decreased when a hold time was added at peak tensile strain. The magnitude of this effect depended on the specific mechanisms and whether they resulted in a change in fracture mode from transgranular in pure fatigue to intergranular in creep-fatigue for a particular temperature and strain range combination. Increases in the tensile hold duration beyond an initial value were not detrimental to the creep-fatigue resistance at 950 degrees C but did continue to degrade the lifetimes at 850 degrees C.},
doi = {10.2172/1202891},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {5}
}

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