Abstract
Samples of solution-annealed Type 316 stainless steel were irradiated at 803 K with 1.1 MeV nitrogen ions up to 60 dpa at peak and the precipitates induced by the irradiation were examined by electron microscopy. The ratio of injected nitrogen concentration to dpa is estimated to be about 0.3 at%/dpa in an observed area. An ordered γ'-phase of nominally Ni 3Si is identified to form in the sample irradiated to 20 dpa; it shows superlattice spots in the electron diffraction pattern and enrichment of Si and Ni at the precipitate in EDS analysis. In the sample irradiated to 42 dpa, platelet precipitates of 18 nm in average diameter were observed with the number density of 7.4 × 10 21/ m 3. The precipitate grows to an average diameter of 28 nm with little change in number density during irradiation from 42 to 60 dpa. The precipitate formed in the sample irradiated to 60 dpa was confirmed to be in the CrN phase with electron diffraction patterns and the spacing of moiré fringes.
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