Microstructure and Swelling of Fast Neutron Irradiated Type 304 Stainless Steel.
NAVAL RESEARCH LAB WASHINGTON D C
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The effects of high-fluence, fast-neutron irradiation on the microstructure, swelling, and microhardness were evaluated for annealed Type 304 stainless steel that had attained fluences near 1.6 X 10 to the 23rd power nsq cm 0.1 MeV at irradiation temperatures from 370C to 470C 698F to 878F. Transmission electron microscopy was employed to characterize the radiation-induced void and defect structures. A maximum swelling of 10.4 was determined by immersion density measurements and independently confirmed from the microscopy data. Ambient temperature microhardness measurements were found to be in general agreement with calculated microhardness values based on the microscopy data. The calculations indicate that the radiation-induced voids were the primary microstructural component responsible for the measured microhardness. All results show the strong influence of the irradiation temperature and neutron fluence gradients experienced by the material during the EBR-II exposure.
- Properties of Metals and Alloys
- Fission Reactor Materials