A LOCAL APPROACH TO CLEAVAGE FRACTURE OF A508 STEEL

摘要

The fracture behaviour of a bainitic A508 C1.3 steel has been investigated on the lower shelf of fracture toughness (lower transition). Different specimen geometries have been tested in a large number. Fractographic examination yielded both the type and co-ordinates of the cleavage initiation sites. It was found that cleavage initiation is often associated with the presence of inclusions. FEM analyses allowed to associate the local failure stress with each of the sites. Finally, in a local approach to fracture, the Beremin model is applied to the entire set of specimen geometries, and a possibility for an extension of this model is discussed.