Abstract
Effects of solute hydrogen on slip deformation behavior and dislocation–defect interaction were investigated by using Fe ion-irradiated stainless steels. Types 304 and 316 stainless steel (304SS and 316SS) specimens irradiated to 10dpa with 2.8MeV Fe ions were strained in tension to 2% plastic strain at 573K in 3 or 75MPa hydrogen and 1atm argon gas atmospheres, and then slip line spacing and height measurements and cross-sectional microstructure observations were conducted. Slip concentration into dislocation channels due to irradiation was suppressed in the presence of solute hydrogen because solute hydrogen is suggested to promote sweeping of dislocation loops by dislocation glide. Such effects of solute hydrogen would mitigate slip localization in neutron-irradiated stainless steels. The effects of solute hydrogen were not observed for 316SS specimens, probably due to insufficient hydrogen concentration, because hydrogen-carrying dislocations could more readily cross-slip in steels with high stacking fault energies resulting in less accumulation of solute hydrogen at dislocation–defect interaction points.
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