Abstract
Samples of Type 316 stainless steel and this steel modified with 0.58 wt% Ti (316 + Ti) aged for 11,000 h at 923 K were irradiated with 0.5 MeV He-ions at 973 K to a dose of 1 × 10 21 He/m 2 . In the aged 316 steel, small helium bubbles of 3.7 × 10 22/m 3 in density with an average diameter of 5 nm produced a small swelling of 0.3 %, which is much less than the swelling of 2 % for the reference solution annealed 316 steel. Bubbles in the aged 316+Ti steel were considerably large, 28 nm in average diameter and the bubble number density of 2.7 × 10 21 /m 3 was comparable to that for the reference sample. The resultant swelling of 5.5 % in the aged 316+Ti steel was fifteen times larger than the swelling in the aged 316 steel.
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