Abstract
On the fracture surfaces of precracked Charpy specimens of various steel grades, the stretch zones were determined by means of a scanning electron microscope, and coordinated with the results of the instrumented Charpy test. Dynamic values of fracture initiation toughness, ♂dior Jdi, can be determined from the stretch zone height. The temperature dependence of the stretch zone permits a fracture initiation transition temperature Ti to be defined. Measuring the stretch zone on precracked Charpy specimens yields a better relationship between the microstructural and topgraphical features of the crack tip behaviour and macroscopic dynamic fracture toughness parameters.
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