Abstract
Abstract A large quantitative fractographic study was carried out onan A508 C1.3 pressure vessel steel in the temperature range corresponding to the ductile-to-brittle transition. Fractographic analyses of fractured Charpy V-notch (CVN) and compact tension (CT) specimens revealed a certain proportion of ductile fracture preceding cleavage, even if the specimens were tested at temperatures below the DBTT. The influence of the ductile tearing on cleavage triggering was studied. In particular, the stress concentrations in CT and/or CVN specimens induced by the presence of an ellipsoidal defect representing the cluster of debonded MnS inclusions were calculated by finite element method and related to the fracture probability given by Beremin model.
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