Abstract
A simulation experiment by electron irradiation using a HVEM was carried out at a dose rate of about 2 × 10 −3 dpa s −1 at a temperature of 723 K on high manganese-chromium austenitic steels with various solute concentrations, i.e., 19 wt% Mn, 16 wt% Cr, 0.1 wt% C and 0.03−5.9 wt% Ni. Voids formed in all specimens and their distribution was different depending on Ni solute concentration. For the specimen with higher Ni concentration, void formation tended to be retarded, and the incubation irradiation dose for void nucleation became longer in comparison with the specimen with lower Ni concentration. The resultant void swellings at 13 dpa were 1.3% and 0.3% for the specimens with lowest and highest Ni contents, respectively. In addition to their void swelling observations we also observed during irradiation the formation of new phases with strain contrast in the vicinity of the grain boundaries. The results of the compositional analysis of these regions including the new phases showed the segregation of Si and Ni, and the depletion of Mn and Cr. From these results it is suggested that compositional change of solute due to segregation and/or depletion induces an austenite phase instability.
Published Version
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