Study of the Fatigue Fracture Surface Regions of Steels Using Microbeam Synchrotron X-Ray Diffraction
نویسندگان
چکیده
A cyclic plastic zone area near fatigue-fractured surface was studied using a back-reflection camera and high intensity, microbeam, synchrotron X-ray source (SR) in order to measure the variation of the stress intensity factor range (AK) along the fatigue fracture. The existence of subgrains within the cyclic plastic region was shown by the appearance of small spots in the Debye-Scgerrer rings of the imaging plate. This effect did not exist outside of the cyclic plastic area. The size of the cyclic plastic zone below the surface was estimated from the relation between the number of spots in a Debye-Scherrer ring and the depth from the fracture surface. AK was measured from this relation. A synchrotron X-ray source made these measurements possible within a high positional resolution and a reasonable period of exposure time.
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