Correlation of mechanical property changes in neutron irradiated pressure vessel steels on the basis of spectral effects
Defect production functions derived from atomistic modeling were evaluated for use in correlating yield stress changes of A212B and A302B pressure vessel steels irradiated in a wide variety of neutron spectra at low temperatures (40--90{degree}C) and low doses (<0.1 dpa). The irradiations were performed in RTNS-II, OWR, ORR and the HFIR pressure vessel surveillance positions. The data from RTNS-II, OWR and ORR are correlated fairly well on the basis of dpa, but the data from HFIR show that only one tenth as many dpa are needed to produce the same radiation-induced yield stress changes as in the other neutron spectra. About 96% of the neutrons in the HFIR surveillance position are thermal neutrons, and a significant fraction of the displacements is produced by recoils from thermal neutron captures. The best correlation of all the data is achieved when the property changes are compared on the basis of the production of freely migrating self-interstitial defects, which better represents the defects participating in the radiation strengthening process.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6168423
- Report Number(s):
- PNL-SA-17094; ON: DE91005044
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
PRESSURE VESSELS
DAMAGING NEUTRON FLUENCE
STEEL-ASTM-A212
STEEL-ASTM-A302
THERMONUCLEAR REACTOR MATERIALS
PHYSICAL RADIATION EFFECTS
CORRELATIONS
DISPLACEMENT RATES
MECHANICAL PROPERTIES
NEUTRON SPECTRA
STRESSES
ALLOYS
CARBON STEELS
CONTAINERS
IRON ALLOYS
IRON BASE ALLOYS
LOW ALLOY STEELS
MANGANESE ALLOYS
MATERIALS
MOLYBDENUM ADDITIONS
MOLYBDENUM ALLOYS
NEUTRON FLUENCE
RADIATION EFFECTS
SPECTRA
STEEL-MNMO
STEELS
700209* - Fusion Power Plant Technology- Component Development & Materials Testing
700201 - Fusion Power Plant Technology- Blanket Engineering
360106 - Metals & Alloys- Radiation Effects