抄録
Microstructural evolution and radiation induced segregation under electron irradiation have been observed with a HVEM in pure Fe-16Cr-17Ni-0.1P-(0.1∼0.25)Ti alloys. It was shown that P atoms served as the nuclei for interstitial loops in the alloy containing both P and Ti as well as the alloy containing P only. In the alloys containing both P and Ti, vacancy loop formation was prominent even at higher temperatures compared with alloys containing P only. These phenomena resulted in a remarkable suppression of void swelling and radiation-induced Ni depletion in matrices. The swelling suppression seemed to be related with the P concentration in matrices. Because of the strong interaction between P and Ti, P segregation to the defect sinks (grain boundary, dislocation and free surface) was retarded maintaining the P effect to suppress swelling in the matrix. The formation of M2P-type phosphides which act as defect sinks at higher temperatures was enhanced by Ti addition. These results suggest that the co-addition of P and Ti is very effective for increasing swelling resistance.
