Abstract
Tensile specimens of 9Cr-1MoVNb and 12Cr-1MoVW steels with up to 2% Ni and 2 1 4 Cr-1Mo steel were tested at room temperature after irradiation at ~ 50 ° C to displacement-damage levels of up to 25 dpa in the High-Flux Isotope Reactor (HFIR). Nickel was added to the ferritic steels to produce helium by a two-step (n, α) reaction with thermal neutrons during irradiation in the mixed neutron spectrum of HFIR. Up to 327 appm He was produced in the steels with 2% Ni. Irradiation caused an increase in the strength of all the steels. With an increase in fluence, there was a decrease in the rate of strength increase, but the strength was still increasing after 20 to 25 dpa. Strength increases were accompanied by a loss of ductility, although the ductility appeared to go through a minimum and was greater at the highest fluences than at intermediate fluences. The results were interpreted to mean that the transmutation helium that was generated during irradiation caused part of the strength increase.
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