Abstract
The feasibility of developing suitable ultrasonic non-destructive evaluation techniques for detecting and characterizing a variety of inclusions, such as stainless steel, alumina and silica, in fully dense prealloyed Ti-6Al-4V powder compacts has been investigated. The investigation showed that all species of inclusions 180 μm in diameter and larger can be readily detected using focussed ultrasonic transducers. Inclusions with a lower acoustic impedance than the Ti-6Al-4V powder material are easily distinguished from those inclusions that have a higher acoustic impedance by observing the phase of the signal. This method could be an effective accept/reject method for aerospace grade, fatigue-critical, powder-compact components, and also predict the types of inclusions present.
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