The effect of high fraction of twin boundaries on radiation-induced segregation in AISI304 stainless steel was investigated using 4.8MeV proton beam at 300C. AISI304 stainless steel samples were irradiated to 0.86 and 1.00dpa and characterization of radiation-induced segregation was done using Electrochemical potentiokinetic reactivation tests at different depth from the surface. Localized attack on different microstructural features, grain and twin boundaries and in-grain pit-like features, was further evaluated by atomic force microscopy. The results clearly indicated that attack was mostly confined to twin boundaries, implying that the twin boundaries acted as a preferred defect sink.

Radiation-Induced Segregation in Austenitic Stainless Steel Type 304: Effect of High Fraction of Twin Boundaries. P.Ahmedabadi, V.Kain, K.Arora, I.Samajdar, S.C.Sharma, S.Ravindra, P.Bhagwat: Materials Science and Engineering A, 2011, 528[25-26], 7541-51