An "experimental" stainless steel with ultra-fine grains and with and without dispersions of fine oxide particles has been irradiated with 1 MeV electrons in a High Voltage Electron microscope; samples with and without implanted helium have been irradiated. It is shown that the nucleation of voids and the resultant volume swelling are severely reduced by decreasing the size of the grain under irradiation. A further reduction in swelling is obtained in the specimens containing dispersions of oxide particles. The implanted helium atoms increase the void number density in large grains but have very little effect in the small ones. The present results are found to be consistent with a model based on the migration of point defects to grain boundaries giving rise to a grain size dependent vacancy concentration in the grain interior within a certain grain size range. It is concluded that the grain refinement and dispersion of small particles lead to a highly swelling resistant material which may be considered as an attractive candidate material for the fast breeder reactor application.
|Place of Publication||Roskilde, Denmark|
|Publisher||Risø National Laboratory|
|Number of pages||43|
|Publication status||Published - 1974|
|Series||Denmark. Forskningscenter Risoe. Risoe-R|
- Risø report 287