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- W2022356475 abstract "Comparisons are made of tensile data on specimens of A212B and A302B pressure vessel steels irradiated at low temperatures (40–90°C) and to low doses ( < 0.1 dpa) with 14 MeV D-T fusion neutrons in the Rotating Target Neutron Source (RTNS-II), with fission reactor neutrons in the Omega West Reactor (OWR) and the Oak Ridge Research Reactor (ORR), and with the highly thermal spectrum at the pressure vessel surveillance positions of the High Flux Isotope Reactor (HFIR). For each neutron spectrum, damage cross sections are determined for several defect production functions derived from atomistic computer simulations of collision cascades. Displacements per atom (dpa) and the numbers of freely migrating defects are tested as damage correlation parameters for the tensile data. The data from RTNS-II, OWR and ORR correlate fairly well when compared on the basis of dpa, but the data from HFIR show that only about one sixth as many dpa are needed to produce the same radiation-induced yield stress changes as in the other neutron spectra. In the HFIR surveillance position a significant fraction of the displacements is produced by recoils resulting from thermal neutron captures. Having energies of about 400 eV, these recoils are much more efficient per unit energy at producing freely migrating defects than the high energy recoils responsible for most of the displacements in the other neutron spectra considered. A significantly better correlation of data from HFIR with those from the other spectra is achieved when the property changes are compared on the basis of the production of freely migrating self-interstitial defects. This parameter may better represent the defects participating in the radiation strengthening process in this temperature and fluence regime." @default.
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- W2022356475 date "1991-01-01" @default.
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- W2022356475 title "Correlation of mechanical property changes in neutron-irradiated pressure vessel steels on the basis of spectral effects" @default.
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- W2022356475 doi "https://doi.org/10.1016/0022-3115(91)90451-c" @default.
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