IGCAR : Annual Report - Indira Gandhi Centre for Atomic Research
IGCAR : Annual Report - Indira Gandhi Centre for Atomic Research
IGCAR : Annual Report - Indira Gandhi Centre for Atomic Research
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IGC<br />
<strong>Annual</strong> <strong>Report</strong> 2007<br />
Fig.2 Shear punch testing of irradiated SS316 specimens (a) test setup (b) load-displacement<br />
plots showing increase in the maximum load with increasing dpa<br />
studies. Prior to preparation of<br />
irradiated specimens, extensive<br />
trials were carried out with<br />
unirradiated specimens to<br />
optimize the pre-thinning and<br />
electrolytic<br />
thinning<br />
parameters. TEM specimens<br />
were prepared using special<br />
fixtures developed <strong>for</strong> handling<br />
irradiated specimens.<br />
Irradiated specimens which had<br />
undergone displacement<br />
damage from 2 dpa to 56 dpa<br />
have been examined using 200<br />
keV Analytical TEM.<br />
A considerable increase in<br />
the strength and decrease in<br />
the ductility of the wrapper with<br />
increasing displacement per<br />
atom (dpa) have been observed<br />
from the small specimen<br />
mechanical tests. The<br />
transmission electron<br />
microscopic studies revealed<br />
the presence of voids and<br />
precipitates in the matrix (Fig<br />
3). Precipitates were identified<br />
to be of M23C6 type and<br />
precipitation of second phases<br />
corroborates the hardening<br />
observed on the wrapper.<br />
Precipitates<br />
Voids<br />
Fig.3 TEM image of the irradiated SS316 at a displacement damage of 40 dpa<br />
52 R&D FOR FBRs
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