Abstract
Ti-modified austenitic stainless steels (0.06 C-0.5 Si-15 Cr-15 Ni-2 Mo-0.2 Ti) plus P and/or B additions up to 0.06 wt% and 60 wtppm respectively, were irradiated with 10 keV He + ions at a dose rate of 1.8 × 10 18 He +/ m 2 s at 923 K. Irradiation was performed on foil specimens in a transmission electron microscope equipped with an ion-accelerator up to a fluence of 1 × 10 21 He +/ m 2. Small (< 5 nm) bubbles were formed in the depth region ranging from 5 and 15 nm from the foil surface of the specimen irradiated up to a fluehnce of 9 × 10 18 He +/ m 2. These bubbles grew continuously during the following irradiation. They were often observed to grow by coalescence. Bubble growth by coalescence was suppressed by Ti-modification. Both P and B additions enhanced the suppression effect of Ti-modification.
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