Segregation behavior induced by various particle irradiations in austenitic stainless steels

Radiation induced segregation (RIS) occurred in austenitic stainless steels was investigated to account for differences in RIS behavior under various irradiation conditions. Measured composition profiles in austenitic stainle ss steels irradiated by neutron in a boiling water reactor. 1 MeV electron or GO MeV He, were analyzed by computer simulations based on the inverse-Ki rkendall model. By using corresponding damage efficiency of each irradiatio n as an input parameter in addition to dose rate and irradiation temperatur e; calculations almost reproduced the measured RIS behavior. This suggested that the damage efficiency was a useful parameter of RIS for different par ticle irradiations. However, inconsistencies between measurements and calcu lations appeared in the irradiation conditions at high dose and high dose r ate at about 570 It. To account for them consistently, further studies incl uding the effect of microstructural evolution on RIS behavior were required .