b'Figure 2. Comparison of 1% offset effective shear stress and maximum effective shear stress at doses between 15 dpa and 20 dpa for (a) HT-9 and (b) 14YWT as a function of irradiation temperature. Dotted lines mark the average, maximum, and 1% offset shear strain for the unirradiated control samples tested at room temperature. The average control maximum shear stress was 56617, and the 1% offset was 38437 MPa for HT-9. The average control maximum shear stress was 90314 and the 1% offset was 66125 MPa for 14YWT.Accomplishments:temperature, the 1 % offset shear Shear punch mechanical testing wasstress and maximum shear stress performed on neutron irradiateddecreased. The advanced 14YWT HT-9 and 14YWT alloys comparingalloy was less sensitive to irradiation the traditional FM steel to thetemperature with respect to irra-advanced ODS NFA. The samplesdiation hardening. However, it still were irradiated at various tempera- exhibited irradiation hardening at tures between 380 and 520 C. Ineach temperature.HT-9, by increasing the irradiation 144 2020|AFC ACCOMPLISHMENTS'