Abstract
The mechanism responsible for radioinduced embrittlement in a double- vacuum-melted 20% Cr: 25% Ni: Nb stabilized steel was investigated. After thermal and fission neutron irradiation the specimens were tested at room temperature, 750 or 850 deg C at a strain rate of 2 x 10/sup -4/ sec/sup -1/ in a hard beam autographically recording dynamometer tensile machine operated remotely within a 4 ft thick concrete cell. With the possible exception of 0.2% proof stresses of the samples tested at 750 deg C, the stress values were not significantly affected by the irradiation; however, the elongations to fracture were markedly reduced at both test temperatures. The elevated temperature embrittlement is a function of the thermal neutron dose and cannot be correlated with the fission (or fast) neutron dose. This is in contrast to the room temperature point defect hardening and embrittlement that is dependent on the fast neutron dose. (P.C.H.)
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