Small-angle neutron scattering study of post-irradiation annealed neutron irradiated pressure vessel steels

Comparative small-angle neutron scattering study of neutron-irradiated Fe, Fe-based alloys and a pressure vessel steel

“…5c). They are bounded by the A-ratios expected for pure fully coherent Cu precipitates, A = 12, and for pure vacancy clusters, A = 1.4 [32]. There is a monotonic relationship between A-ratio and Cu-vacancy ratio of a Cu-vacancy cluster (Fig.…”

“…According to former experience there is a pronounced correlation between the square root of volume fraction of irradiation-induced clusters and either yield stress increase or hardness increase [31,32]. We remind that the SANS volume fraction was calculated on the assumption of non-magnetic clusters.…”

“…There is a monotonic relationship between A-ratio and Cu-vacancy ratio of a Cu-vacancy cluster (Fig. 6) [32,33]. The dose dependences of the A-ratio and, therefore, of the Cu-vacancy ratio of the average cluster pass through a maximum at about 0.05 dpa.…”

“…(3) and (7) (ignoring the subscript ''measured" and reducing the fraction in Eq. (7) [32]). In order to get a first impression on the effect of dose, the results can be compared with a SANS measurement performed for another heat of pure Fe neutron-irradiated up to a dose of 0.038 dpa [29,30] ( Table 6).…”

Structure, energetics and thermodynamics of copper–vacancy clusters in bcc-Fe: An atomistic study

“…Larger precipitates show a 3R structure which corresponds to a distorted fcc lattice, and with increasing size this structure changes continuously to the fcc structure of pure copper. Cu-rich precipitates observed in neutron-irradiated RPV steels are typically smaller than 4 nm in diameter [4,7].…”