Heat generation and fracture initiation in a stretched steel plate with a process-induced structural defect

The localization of heat release during deformation of a notched steel plate is studied. It is shown that the source of heat generation in the metal specimen is not the whole region of plastic deformation near the tip of the defect (crack), but only the slip bands occupying the relatively small part of the zone (Chernov–Luders bands), in which the deformation initiates physical and chemical processes. It was found that in the slip bands, the metal temperature increases by several tens of degrees (or more). The deformation of notched specimens is characterized by uneven development of plastic deformation in the volume of the material and a high velocity of heat-wave propagation in the direction of the maximum slip stresses.