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    Charpy Impact Test Results of Ferritic Alloys Irradiated to 10 dpa at 55°C

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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)

    Author Information:

    Hu, Wan-Liang
    Senior engineervice-president, Westinghouse Hanford CompanyInnovative Technology Laboratory, Richland, WA

    Gelles, David S.
    Senior engineerstaff scientist, Westinghouse Hanford CompanyPacific Northwest Laboratory, Richland, WA

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP49466S