Microstructure and stress corrosion resistance of alloys X-750, 718, and A-286 in LWR environments: Final report
The results of microstructural characterization and stress corrosion cracking test are presented for several heat treatment conditions of age-hardenable alloys X-750, 718, and A-286 used for in-core components in light-water reactors. Resistance to intergranular stress corrosion cracking was evaluated using slow-strain-rate tests in pressurized-water-reactor primary water, and microstructural etch and rising-load quality assurance tests. Detailed microstructural characterization of these alloys was performed, and stress corrosion cracking susceptibility is related to microstructural features. Alloy X-750 microstructures with heavy grain boundary coverage by Cr/sub 23/C/sub 6/ show better resistance to stress corrosion cracking in primary water, despite grain boundary chromium depletion. Alloys 718 and A-286 have good resistance to cracking in the slow-strain-rate and quality assurance tests, although neither is immune to cracking in reactor service. Results are compared with those of a related program, including crack initiation and crack growth tests in pressurized-water and boiling-water reactor environments. Recommendations are made for improvements in the quality assurance tests and in heat treatment for alloy 718. 29 refs., 15 figs., 9 tabs.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (USA); Babcock and Wilcox Co., Alliance, OH (USA). Research Center
- OSTI ID:
- 6054269
- Report Number(s):
- EPRI-NP-6392-M
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALLOY-A-286
STRESS CORROSION
INCONEL 718
INCONEL X750
AGE HARDENING
BWR TYPE REACTORS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHROMIUM CARBIDES
CORROSION RESISTANCE
CRACKS
GRAIN BOUNDARIES
MICROSTRUCTURE
PROGRESS REPORT
PWR TYPE REACTORS
QUALITY ASSURANCE
REACTOR COMPONENTS
RECOMMENDATIONS
STRAIN RATE
TENSILE PROPERTIES
ALLOY-NI53CR19FE19NB5MO3
ALLOY-NI73CR15FE7TI3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
AUSTENITIC STEELS
BORON ADDITIONS
BORON ALLOYS
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
CORROSION
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
DOCUMENT TYPES
HARDENING
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
REACTORS
STEEL-NI26CR15TI2MOVALB
STEELS
TITANIUM ADDITIONS
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
VANADIUM ADDITIONS
VANADIUM ALLOYS
WATER COOLED REACTORS
WATER MODERATED REACTORS
360105* - Metals & Alloys- Corrosion & Erosion
360102 - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties