Reactor pressure vessel steel has been studied by SANS in momentum transfer range c = 0.01-4nm-1 following a special heat treatment giving rise to a strong embrittlement. The neutron scattering revealed an intense growth of precipitates as a result of treatment: the volume content of large defects ∼ 40 nm was increased by ∼ 50% as well as their total interface area (defect-matrix) by ∼ 80% whereas their size remained still stable. At the same time, a weaker influence of treatment on middle-size defects ∼ 10 nm (concentration increased by ∼ 20%, the size by ∼ 6%) was observed. The relationship between the structural and mechanical properties of material is discussed in terms of ductile-to-brittle transformation.
- Structure materials defects
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering