Strength and Notch Ductility of Selected Structural Alloys after High-Fluence, 550 F (288 C) Irradiation,
NAVAL RESEARCH LAB WASHINGTON D C
Pagination or Media Count:
Tensile strength and Charpy-V C sub v notch ductility changes with 550 F irridation were explored for several low alloy structural steels. The study was addressed to metal fracture resistance at upper shelf temperatures and encompassed A302-B, A533-B, A543-1, 9Ni-4Co-.20C, 12-6PH, and 12Ni-5Cr-3Mo steel compositions. Material forms included plate, forging, and weld deposit. Specimen irradiations were conducted in the Advanced Test Reactor ATR neutron fluences ranged from 1 to 7 X ten to the 20th power nsq cm 1 MeV. The implications to postirradiation fracture resistance of C sub v upper-shelf values were assessed using NRL-developed Ratio Analysis Diagram RAD procedures. RAD assessments of a low copper content A533-B plate and weld deposit indicated that thick sections of either material would exhibit plastic fracture behavior after 2.5 X ten to the 20th power nsq cm 1 MeV at 550F. An experimental 12-6PH alloy of higher strength is also shown to have promise for high-fluence applications.
- Metallurgy and Metallography
- Fission Reactor Materials