SEDL / STP / STP782-EB / STP34385S

Ion Damage in 316 Stainless Steel Over a Broad Dose Range

Packan, NH
Oak Ridge National Laboratory, Oak Ridge, TN

Farrell, K
Oak Ridge National Laboratory, Oak Ridge, TN

Pages: 10    Published: Jan 1982

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Abstract

Microstructural evolution was examined in annealed 316 stainless steel after heavy-ion bombardment in the range 1 to 256 dpa at 900 K with simultaneously implanted helium at a rate of 10 appm/dpa and deuterium at a rate of 25 appm/dpa. Phase decomposition was rather limited compared with that in neutron irradiations; only an unidentified plate-like precipitate at low dose, and blocky M^{2 3}C⁶ particles on grain boundaries were formed. Swelling from cavity formation increased with dose to about 20% at about 200 dpa above which it appeared to saturate. Cavity concentrations saturated at about 100 dpa, and dislocations much earlier. The matrix cavities included a persistant complement of ∼7-nm diam small cavities. Similar-size helium bubbles were prolific on the grain boundaries.