Abstract
The influence of irradiation on fracture properties of 15Ch2MFA pressure vessel steel is studied. The distribution of inclusions and carbides is characterized. The quantitative fractography of broken Charpy specimens is carried out. The correlation of crack initiation energy and the area of ductile fracture adjacent to the notch is identified. It is shown that most of the absorbed energy belongs to the stage preceding the cleavage crack initiation. From the fracture surface of Charpy specimens the distribution of ductile dimples is investigated. The relationship between the distributions of ductile dimples and second phase particles is discussed.
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