Effects of neutron irradiation on deformation behavior of nickel-base fastener alloys
This paper presents the effects of neutron irradiation on the fracture behavior and deformation microstructure of high-strength nickel-base alloy fastener materials, Alloy X-750 and Alloy 625. Alloy X-750 in the HTH condition, and Alloy 625 in the direct aged condition were irradiated to a fluence of 2.4x10{sup 20} n/cm{sup 2} at 264 C in the Advanced Test Reactor. Deformation structures at low strains were examined. It was previously shown that Alloy X-750 undergoes hardening, a significant degradation in ductility and an increase in intergranular fracture. In contrast, Alloy 625 had shown softening with a concomitant increase in ductility and transgranular failure after irradiation. The deformation microstructures of the two alloys were also different. Alloy X-750 deformed by a planar slip mechanism with fine microcracks forming at the intersections of slip bands with grain boundaries. Alloy 625 showed much more homogeneous deformation with fine, closely spaced slip bands and an absence of microcracks. The mechanism(s) of irradiation assisted stress corrosion cracking (IASCC) are discussed.
- Research Organization:
- Bettis Atomic Power Lab., West Mifflin, PA (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC11-98PN38206
- OSTI ID:
- 755393
- Report Number(s):
- B-T-3242; TRN: US0003439
- Resource Relation:
- Conference: 9th International Conference on Environmental Degradation of Nuclear Power Systems - Water Reactor, Newport Beach, CA (US), 08/01/1999--08/05/1999; Other Information: PBD: 1 Jul 1999
- Country of Publication:
- United States
- Language:
- English
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Irradiation-assisted stress corrosion cracking of HTH Alloy X-750 and Alloy 625
Irradiation assisted stress corrosion cracking of HTH Alloy X-750 and Alloy 625