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Title: Creep-fatigue of High Temperature Materials for VHTR: Effect of Cyclic Loading and Environment

Abstract

Alloy 617 is the one of the leading candidate materials for Intermediate Heat eXchangers (IHX) of a Very High Temperature Reactor (VHTR). System start-ups and shut-downs as well as power transients will produce low cycle fatigue (LCF) loadings of components. Furthermore, the anticipated IHX operating temperature, up to 950°C, is in the range of creep so that creep-fatigue interaction, which can significantly increase the fatigue crack growth, may be one of the primary IHX damage modes. To address the needs for Alloy 617 codification and licensing, a significant creep-fatigue testing program is underway at Idaho National Laboratory. Strain controlled LCF tests including hold times up to 1800s at maximum tensile strain were conducted at total strain range of 0.3% and 0.6% in air at 950°C. Creep-fatigue testing was also performed in a simulated VHTR impure helium coolant for selected experimental conditions. The creep-fatigue tests resulted in failure times up to 1000 hrs. Fatigue resistance was significantly decreased when a hold time was added at peak stress and when the total strain was increased. The fracture mode also changed from transgranular to intergranular with introduction of a tensile hold. Changes in the microstructure were methodically characterized. A combined effect of temperature,more » cyclic and static loading and environment was evidenced in the targeted operating conditions of the IHX. This paper This paper reviews the data previously published by Carroll and co-workers in references 10 and 11 focusing on the role of inelastic strain accumulation and of oxidation in the initiation and propagation of surface fatigue cracks.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Idaho National Laboratory (INL)
Sponsoring Org.:
DOE - NE
OSTI Identifier:
1023464
Report Number(s):
INL/CON-11-20780
TRN: US1104553
DOE Contract Number:  
DE-AC07-05ID14517
Resource Type:
Conference
Resource Relation:
Conference: 2011 International Congress on Advances in Nuclear Power Plants (ICAPP 2011),Nice, France,05/02/2011,05/05/2011
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AIR; ALLOYS; COOLANTS; CRACK PROPAGATION; CREEP; FOCUSING; FRACTURES; HEAT EXCHANGERS; HELIUM; IDAHO; LICENSING; MICROSTRUCTURE; NUCLEAR POWER PLANTS; OXIDATION; STRAINS; TESTING; TRANSIENTS; alloy 617; creep-fatigue

Citation Formats

Cabet, Celine, Carroll, L, Wright, R, and Madland, R. Creep-fatigue of High Temperature Materials for VHTR: Effect of Cyclic Loading and Environment. United States: N. p., 2011. Web.
Cabet, Celine, Carroll, L, Wright, R, & Madland, R. Creep-fatigue of High Temperature Materials for VHTR: Effect of Cyclic Loading and Environment. United States.
Cabet, Celine, Carroll, L, Wright, R, and Madland, R. Sun . "Creep-fatigue of High Temperature Materials for VHTR: Effect of Cyclic Loading and Environment". United States. https://www.osti.gov/servlets/purl/1023464.
@article{osti_1023464,
title = {Creep-fatigue of High Temperature Materials for VHTR: Effect of Cyclic Loading and Environment},
author = {Cabet, Celine and Carroll, L and Wright, R and Madland, R},
abstractNote = {Alloy 617 is the one of the leading candidate materials for Intermediate Heat eXchangers (IHX) of a Very High Temperature Reactor (VHTR). System start-ups and shut-downs as well as power transients will produce low cycle fatigue (LCF) loadings of components. Furthermore, the anticipated IHX operating temperature, up to 950°C, is in the range of creep so that creep-fatigue interaction, which can significantly increase the fatigue crack growth, may be one of the primary IHX damage modes. To address the needs for Alloy 617 codification and licensing, a significant creep-fatigue testing program is underway at Idaho National Laboratory. Strain controlled LCF tests including hold times up to 1800s at maximum tensile strain were conducted at total strain range of 0.3% and 0.6% in air at 950°C. Creep-fatigue testing was also performed in a simulated VHTR impure helium coolant for selected experimental conditions. The creep-fatigue tests resulted in failure times up to 1000 hrs. Fatigue resistance was significantly decreased when a hold time was added at peak stress and when the total strain was increased. The fracture mode also changed from transgranular to intergranular with introduction of a tensile hold. Changes in the microstructure were methodically characterized. A combined effect of temperature, cyclic and static loading and environment was evidenced in the targeted operating conditions of the IHX. This paper This paper reviews the data previously published by Carroll and co-workers in references 10 and 11 focusing on the role of inelastic strain accumulation and of oxidation in the initiation and propagation of surface fatigue cracks.},
doi = {},
url = {https://www.osti.gov/biblio/1023464}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {5}
}

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