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Journal of Electron Microscopy 48(5): 575-580 (1999)
© 1999 Oxford University Press

Damage structure in austenitic stainless steel 316LN irradiated at low temperature in the HFIR

N. Hashimoto1, E. Wakai2 and J. P. Robertson1

1Metals and Ceramics Division, Oak Ridge National Laboratory Oak Ridge, TN 37831-6376, USA
2Japan Atomic Energy Research Institute Tokai-mura Ibaraki-ken 319-1195, Japan

An austenitic stainless steel 316LN irradiated to damage levels of about 3 dpa at irradiation temperatures of about 90°C and 2 50°C has been examined by transmission electron microscopy. The irradiation at 90°C and 250°C induced a dislocation loop density of 3.5 × 1022 m–3 and 5.2 × 1022 m–3, and a black dot density of 2.2 × 1023 m–3 and 1.1 × 1023. m–3, respectively, in the steel. A low density (<1 ×1019 m–3)of radiation-enhanced precipitates was observed in the matrix at both irradiation temperatures. No cavities were observed at both irradiation temperatures. These features are correlated with the changes in tensile properties. It is concluded that the dislocation loops and the black dots cause irradiation hardening and a decrease in the uniform elongation in the 316LN steel irradiated at low temperatures.

Keywords     neutron irradiation, austenitic stainless steel, Frank loop, irradiation hardening

Received      3 December 1998, accepted 15 June 1999


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