Validation of a high resolution x-ray technique within the PARENT program
Paper in proceeding, 2014

The PARENT Round Robin Test (RRT) comprises a study of the efficiency of different nondestructive examination (NDE) techniques to detect and size stress corrosion (SCC) crack in Ni-base material. This report describes an x-ray technique that has been used for detection and characterization of these defects. The x-ray source is a 450 kV x-ray machine and the detector is CCD-based with fiber optic lens and glass fiber optic scintillation screen. The imaging area of the detector is only 27 x 27 mm but the spatial resolution is very high. The un-sharpness in the image plane is measured to be less than 0.08 mm. X-ray radiography is a volumetric method and to be able to detect cracks or parts of cracks the orientation has to be reasonably parallel with the x-ray beams. Therefor each defect is radiographed in series of projections. The projection angle is from -10° to +10°, with increments of 2°. To determine the size or the depth of the cracks a method are developed which describes the depth as function of the movement of the observed crack tip between the end positions in the series of exposures.


Lars Hammar

Chalmers, Materials and Manufacturing Technology, Advanced Non-destructive Testing

Håkan Wirdelius

Chalmers, Materials and Manufacturing Technology, Advanced Non-destructive Testing

Proceedings of the 10th International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components

1831-9424 (eISSN)

978-92-79-36759-5 (ISBN)

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