MANUFACTURING OF STANDARD TEST BLOCKS CONTAINING ARTIFICIAL DEFECTS FOR ULTRASONIC INSPECTION

摘要

Standard test blocks, to be used in ultrasonic inspection, made of Steel, Superalloy or Titanium alloys that contains artificial defects of known type, shape, size and with known spatial position in the subject part are composed of two parts (1 and 2). Artificial defects of various kinds, shapes and dimensions (e.g. voids, oxides, carbides, regions of abnormally grown grains - regions of larger grains than matrix-, compositional defects -regions of different composition than the matrix material-, or defects made of specific phase of the matrix material (6 and 7)) are formed on (3 and 4), or placed into the accurately prepared matching cavities (5) prepared on the surfaces of the two blocks to be diffusion-bonded. After these defect are formed on or placed into the cavities prepared on their surfaces the blocks pressed via vacuum hot pressing (VHP) or hot isostatic pressing (HIP) using different parameters of temperature, time and stress (load/area) depending on the material creating diffusion bonding without plastic deformation of the host material. These to-be-standard-test-blocks bonded via VHP or HIP techniques can be used as calibration blocks in ultrasonic inspection, and by this use characterization of the structural defects in aircraft engine parts or in the parts of other actual systems requiring ultrasonic inspection becomes possible. By characterization of defects the life estimations of each aircraft engine parts following ultrasonic inspection can be made more realistically.