Abstract
Corrosion behavior and compositional changes at grain bounadries were examined in Type 304 and 304L stainless steels irradiated up to 6 × 10 25 n/ m2 ( E > 1 MeV) at 323 and 573 K. The rate of intergranular attack in boiling HNO 3 +Cr 6+ solution increased with increasing fluence in commercial purity stainless steels. High purity 304L (low phosphorus and silicon) was immune to corrosion in this solution both before and after irradiation. The enhancement of intergranular attack in commercial purity stainless steels due to irradiation was related to the increase of phosphorus and silicon at grain boundaries, as detected by STEM/EDX analysis.
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