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Title: Creep and Environmental Effects on High Temperature Creep-Fatigue Behavior of Alloy 617

Abstract

Alloy 617 is the leading candidate material for Intermediate Heat Exchanger (IHX) of a Very High Temperature Reactor (VHTR), expected to have an outlet temperature as high as 950 C. System start-ups and shut-downs as well as power transients will produce low cycle fatigue (LCF) loadings of components. Acceptance of Alloy 617 in Section III of the ASME Code for nuclear construction requires a detailed understanding of the creep-fatigue behavior in both air and impure helium, representative of the VHTR primary coolant. Strain controlled LCF tests including hold times at maximum tensile strain were conducted at total strain range of 0.3% in air at 950 C. Creep-fatigue testing was also performed in a simulated VHTR impure helium coolant for selected experimental conditions. The fatigue resistance decreased when a hold time was added at peak tensile stress, consistent with the observed change in fracture mode from transgranular to intergranular with introduction of a tensile hold. Increases in the tensile hold time, beyond 180 sec, was not detrimental to the creep-fatigue resistance. Grain boundary damage in the form of grain boundary cracking was present in the bulk of the creep-fatigue specimens. This bulk cracking was quantified and found to be similar formore » hold times of up to 1800 sec consistent with the saturation in failure lives and rapid stress relaxation observed during the creep portion of the creep-fatigue cycle.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Idaho National Laboratory (INL)
Sponsoring Org.:
DOE - NE
OSTI Identifier:
1028225
Report Number(s):
INL/JOU-11-20890
TRN: US1105555
DOE Contract Number:  
DE-AC07-05ID14517
Resource Type:
Journal Article
Journal Name:
Journal of ASTM International
Additional Journal Information:
Journal Volume: 8; Journal Issue: 6
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; AIR; ALLOYS; CRACKING; CREEP; FAILURES; FATIGUE; FRACTURES; HEAT EXCHANGERS; HELIUM; INCONEL 617; VHTR REACTOR; REACTOR COMPONENTS; STRAINS; STRESS RELAXATION; TEMPERATURE RANGE 0400-1000 K; TEMPERATURE RANGE 1000-4000 K; TESTING; TRANSIENTS; Alloy 617; creep-fatigue; creep-fatigue interaction; environment; helium; nickel alloy

Citation Formats

Carroll, L J, Cabet, C, Madland, R, and Wright, R. Creep and Environmental Effects on High Temperature Creep-Fatigue Behavior of Alloy 617. United States: N. p., 2011. Web.
Carroll, L J, Cabet, C, Madland, R, & Wright, R. Creep and Environmental Effects on High Temperature Creep-Fatigue Behavior of Alloy 617. United States.
Carroll, L J, Cabet, C, Madland, R, and Wright, R. Wed . "Creep and Environmental Effects on High Temperature Creep-Fatigue Behavior of Alloy 617". United States.
@article{osti_1028225,
title = {Creep and Environmental Effects on High Temperature Creep-Fatigue Behavior of Alloy 617},
author = {Carroll, L J and Cabet, C and Madland, R and Wright, R},
abstractNote = {Alloy 617 is the leading candidate material for Intermediate Heat Exchanger (IHX) of a Very High Temperature Reactor (VHTR), expected to have an outlet temperature as high as 950 C. System start-ups and shut-downs as well as power transients will produce low cycle fatigue (LCF) loadings of components. Acceptance of Alloy 617 in Section III of the ASME Code for nuclear construction requires a detailed understanding of the creep-fatigue behavior in both air and impure helium, representative of the VHTR primary coolant. Strain controlled LCF tests including hold times at maximum tensile strain were conducted at total strain range of 0.3% in air at 950 C. Creep-fatigue testing was also performed in a simulated VHTR impure helium coolant for selected experimental conditions. The fatigue resistance decreased when a hold time was added at peak tensile stress, consistent with the observed change in fracture mode from transgranular to intergranular with introduction of a tensile hold. Increases in the tensile hold time, beyond 180 sec, was not detrimental to the creep-fatigue resistance. Grain boundary damage in the form of grain boundary cracking was present in the bulk of the creep-fatigue specimens. This bulk cracking was quantified and found to be similar for hold times of up to 1800 sec consistent with the saturation in failure lives and rapid stress relaxation observed during the creep portion of the creep-fatigue cycle.},
doi = {},
url = {https://www.osti.gov/biblio/1028225}, journal = {Journal of ASTM International},
number = 6,
volume = 8,
place = {United States},
year = {2011},
month = {6}
}