Abstract
We examined the effects of microstructural change due to prolonged aging before irradiation on void formation in Ti-added Fe25Ni15Cr0.02C alloys with 150 keV proton irradiation. Void swelling of the 0.25 wt.% Ti-added alloy when aged and irradiated at 923 K was about twice as high as that of the solution-annealed alloy, regardless of aging time from 0.36 to 28.8 Ms. No voids were formed in the solution-annealed 0.95 wt.% Ti-added alloy irradiated to 30 dpa at 923 K. In the aged ones, however, void formation occurred heterogeneously only in a region near grain boundary, where solute Ti content was reduced to less than 0.39 wt.% because of grain boundary precipitation of TiC or radiation induced depletion of Ti atoms. Void swelling in this region increased greatly from 1 to 23 % as solute Ti content decreased from 0.36 to 0.26 wt.% on approach to the grain boundary.
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