Abstract
The purpose of this study is to understand the effects of grain boundary misorientation on the solute segregation in austenitic stainless steels irradiated by protons. Many studies have shown that, for the Gibbsian type of segregation, the grain boundaries possess an ordered structure and the degree of segregation depends on the grain boundary misorientation. In contrast to the Gibbsian type of segregation, radiation induced segregation at grain boundaries is a non-equilibrium segregation phenomena. The 304 and 316L specimens were chosen for this study and irradiated by 5 MeV protons at a temperature of 450°C. The Cr/Ni-concentration profiles were measured by FEG/EDS and the grain boundary misorientation was determined by Kikuchi patterns. It seems from the preliminary results that the segregation to the grain boundary would tend to happen at boundaries with higher Σ value.
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