Abstract
The irradiated fusion materials data base will be initially developed in fisson reactors. Hence, predictions of the in-service performance of materials in fusion reactors must account for the effect of a number of variables which differ between fission and fusion environments. Ideally such fission-fusion correlations should reflect sound mechanistic understanding. In this paper we review the effects of the helium to displacement per atom ratio on microstructural evolution, with emphasis on austenitic stainless steels. Charged particle data is analyzed to determine mechanistic trends. These results appear to be consistent with a more detailed comparison made between data from neutron irradiations of type 316 stainless steel in EBR-II (low helium) and HFIR (high helium). Finally, a model calibrated to the fission reactor data is used to extrapolate to fusion conditions.
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