b'is an effective mechanical testingF/M steels exhibited similar stress- Figure 4. Shear punch stress vs technique for neutron irradiatedstrain responses at irradiations ofstrain. a) Curves for Eurofer97, HT-9 steels, supporting technical objective7 dpa at 280 C, and the advancedand T91 irradiated at 280 C to a iv). Figure 3 shows the setup of theMA-957 irradiated at temperaturesdose of 7 dpa and He accumulation of 275 appm. b) Curves for MA-957, shear punch testing.between 440 and 490 C to 9 andirradiation temperatures, doses 14 dpa with corresponding Heand He accumulation presented Written accomplishments include theaccumulations of 400 and 800on Figure. Note the serrations completion of a milestone Reportin the curves for MA-957 which and perform shear punch testing ofappm exhibited similar stress-straincorrespond to fracture events on the BOR60 irradiated HT-9 and 14YWT,responses, observed in the stress- sample surfaces, marked by arrows.as well as the submission of astrain curves in Figure 4. Fracture manuscript Shear punch testing ofof the shear punch surfaces of the neutron irradiated HT-9 and 14YWTMA-957 reveals that despite high to the journal JOM.irradiation temperatures, which reduces irradiation hardening, He For the second main thrust, shearaccumulation and sample texture punch mechanical testing wasmay contribute to unacceptable performed to compare neutronfracture even in advanced ferritic irradiated reduced activation steelalloys. This second thrust also Eurofer97, and traditional F/Mdirectly contributes to technical steels HT-9 and T91. Additionally,objectives i)-iv)the response of advanced ODSThe second main thrust resulted MA-957 as a function of dose andin the written accomplishment of He production was investigated.the milestone report Report and What was specifically accomplishedperform fast reactor materials testing was determining the reducedfrom STIP V irradiation.activation steel and the traditional 2019|AFC ACCOMPLISHMENTS 181'