Evolution of the radiation-induced defect structure in 316 type stainless steel after post-irradiation annealing

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Abstract

The thermal stability of Frank loops, black dots, cavities and c0 precipitates in an irradiated 316 stainless steel was studied by transmission electron microscopy. The samples were retrieved from a thimble tube irradiated at around 320 C up to 80 dpa in a commercial nuclear power reactor, and thermally annealed, varying both annealing temperature and time. With increasing annealing temperature the density of all defects gradually decreased, resulting in the complete removal of Frank loops at 550 C. In contrast to other defects, the density of the c0 precipitates sharply decreased with increasing annealing time, which indicates that the dissolution of the c0 precipitates is governed by the iron diffusion length.

Details

Original languageEnglish
Pages (from-to)158-165
Number of pages8
JournalJournal of Nuclear Materials
Volume452
Issue number1-3
DOIs
Publication statusPublished - May 2014

Keywords

  • transmission electron microscopy, stainless steel, post irradiation annealing

ID: 269842