Void swelling in ferritic-martensitic steels under high dose ion irradiation: Exploring possible contributions to swelling resistance

摘要

Ion irradiations were performed on reduced-activation ferritic-martensitic steels CNS (China Nuclear Steel) I and CNS II up to 375 dpa and 450 dpa at 460 degrees C using 5 MeV Fe++ ions with 10 appm and 100 appm pre-implanted helium. The swelling of 9Cr CNS I was 5.7-9%, while the 12Cr CNS II showed 20-300x less swelling than CNS I. Helium effects and possible contributions to swelling resistance in ferritic-martensitic steels were explored based on the results of transmission electron microscopy analysis. Radiation induced high density precipitates (Fe,Cr)(2)C were found to account for the superior swelling resistance of CNS II. (C) 2015 Elsevier Ltd. All rights reserved.