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The determination of the size of flaws in the bulk of duplex stainless steels and the determination of the Probability of Detection (POD) from ultrasonic data is addressed. The ferritic-austenitic mixed microstructure of these steels causes a strong attenuation of the ultrasonic waves. Therefore, the Synthetic Aperture Focusing Technique SAFT has been applied which leads to a reduction of the microstructural noise signals and thus to an improvement of defect detection. Based on the ultrasonic rf-data acquired on a test block with model defects an â-versus-a-approach has been performed to determine the POD for the inspected duplex specimen according to MIL-HDBK-1823. It is shown that SAFT-processing of the ultrasonic data leads to a remarkable improvement of defect detectability.

Enhancement of the POD of Flaws in the Bulk of Highly Attenuating Structural Materials by Using SAFT Processed Ultrasonic Inspection Data