Abstract
For better understanding of the influence of the deleterious elements on the neutron embrittlement of reactor pressure vessel steels, the microstructural evolution due to neutron irradiation was investigated by SANS experiments at ternary iron alloys with different contents of copper and phosphorus. In every case irradiation produces nanoscaled inhomogeneities. The volume fraction of the inhomogeneities increases with the copper content but not with the phosphorus content. Surprisingly, the high-pure alloy shows a relatively high irradiation effect. The irradiation defects vary in type and kinetic of evolution for the different alloys.
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