STANDARD SPECIMEN FOR ULTRASONIC FLAW DETECTION TESTING, ULTRASONIC FLAW DETECTION TESTING METHOD AND BEARING COMPONENT MANUFACTURING METHOD

摘要

To provide a standard specimen for an ultrasonic flaw detection test that can determine the inspection limits and optimize inspection conditions in ultrasonic flaw detection tests to evaluate the effects of multiple small inclusions agglomerated in a narrow area in steel.SOLUTION: A standard specimen for an ultrasonic flaw detection test according to one aspect of the present invention includes: a first member having a first surface and a second surface opposite to the first surface; and a second member having a third surface bonded to the first surface and a fourth surface opposite to the third surface. The first surface is provided with a plurality of first holes that are recessed in a direction from the first surface toward the second surface. The interval between the adjacent first holes in the first surface is twice or less of the square root of the projected area of the first hole as viewed from a direction perpendicular to the first surface.SELECTED DRAWING: Figure 1