In the last few years, considerable research have been conducted in the Engine Titanium Consortium [1] in the study of naturally occurring hard-alpha flaws found in titanium alloys. One task in the Consortium is undertaking a new approach of bringing state-of-the-art geometrical and ultrasonic models together [2–6] to assess the improvements in the capabilities to detect hard-alpha inclusions, as quantified by the probability of detection (POD) [7–8].
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