Abstract
A comparison of the surface roughness factor (SRF), determined by xenon adsorption, has been made for the surfaces of 304 and 316 stainless steels irradiated with 100 keV helium ions. The variation of the SRF value was measured as a function of ion dose. Topological changes of the irradiated surfaces were determined by scanning electron microscopy (SEM). The SRF values were found to increase with increasing ion dose on both of the specimens. The unirradiated surface has SRF values of 2.7 and 1.9 for 304 SS and 316 SS, respectively. After the irradiation to a dose of 0.2 C/cm 2 and 0.5 C/cm 2 at room temperature, SRF increased to 25.6 and 28.1, respectively, on 304 SS, and 7.8 and 14.7, respectively, on 316 SS. SEM photographs revealed that the surfaces were heavily damaged by blistering and flaking for these ion doses, but differently for the two specimens. The average blister diameter observed on the irradiated 304 SS specimen was found to be about three times larger than that observed on the 316 SS specimen. The average number of exfoliated surface layers was about 3.5 for 304 SS, while it was 15 for 316 SS for the identical ion dose of 0.5 C/cm 2. The differences in the SRF values observed on the two materials can be explained by the size and density of blisters and flakes, and the number of ruptured blister skins sticking to the surface.
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