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Miniature Charpy specimens of HT-9 in base metal, weld metal, and heat affected zone (HAZ) metal conditions, and 9Cr-1Mo in base metal and weld metal conditions have been tested following irradiation in the High Flux Isotope Reactor (HFIR) at 55°C to ≈5 and 10 dpa. All specimen conditions are found to have degraded properties (both DBTT and USE). 9Cr-Mo degraded more than HT-9, and weld metal performed worse than base metal, which performed worse than HAZ material. As a function of dose, property degradation was approximately linear, indicating that degradation response had not saturated by 10 dpa.
martensitic alloys, steels, Charpy impact testing, neutron irradiation, HFIR, ductile-brittle transition temperature (DBTT), upper-shelf energy (USE)
Senior engineervice-president, Westinghouse Hanford CompanyInnovative Technology Laboratory, Richland, WA
Gelles, David S.
Senior engineerstaff scientist, Westinghouse Hanford CompanyPacific Northwest Laboratory, Richland, WA