Abstract
The in-pile stress rupture strength of three different types of stabilized austenitic stainless steels was studied. The materials tested were a 16Cr-13Ni-Cb steel (20 and 5 percent cold worked), a 16Cr-16Ni-Cb steel (5 percent cold worked), and a 15Cr-15Ni-Ti-B steel (15 percent cold worked). Irradiation time was up to 4800 h, corresponding to a maximum fast neutron fluence (E >0.1 MeV) of 8.2 × 1021 neutrons(n)/cm2. The specimens were irradiated at 615 and 720 C (1139 and 1328 F). Neutron irradiation caused a marked decrease in time to rupture and rupture strain in all the materials tested. The 15Cr-15Ni-Ti-B steel showed the most severe reduction in time to rupture. This reduction was attributed to high-temperature embrittlement and an increase in creep rate. It was shown that the precipitation behavior of this material was changed by neutron irradiation. The reduction in time to rupture was lower for the 16Cr-13Ni-Cb and 16Cr-16Ni-Cb steels. No enhancement in creep rate could be detected. The rupture strains measured were higher than 1 percent for the two columbium-stabilized steels, whereas they were below 1 percent for the 15Cr-15Ni-Ti-B steel.
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