Microstructural Examination of Fe-Cr Binary Ferritic Alloys Following Irradiation to 15 Dpa in FFTF (Fast Flux Test Facility).

摘要

The objective of this work is to determine the effect of neutron irradiation on microstructural development in simple ferritic alloys. The present experiment also allows comparisons due to spectrum differences between EBR-II and FFTF. Microstructural examinations are reported for six Fe-Cr binary alloys (from 3 Cr to 18 Cr) following irradiation in FFTF at 430/degree/C to 15 dpa. All specimens contained radiation damage such as dislocation loops and voids. Swelling was highest, 0.26 percent, in the Fe-9Cr alloy with a corresponding dislocation network comprising equal parts of alpha and alpha /2 Burgers vectors. Less swelling was found in other alloys with corresponding dislocation structures composed mainly of alpha loops. An example of a deformation slip band containing elongated voids was found which indicates that channel fracture may occur in ferritic alloys that contain uniform void swelling. 17 refs., 11 figs., 2 tabs.