Accession Number : ADP004126

Title :   Ultrasonic Evaluation of Titanium Contamination with Correlation Techniques,

Corporate Author : PURDUE UNIV LAFAYETTE IN

Personal Author(s) : Furgason,E. S. ; Lee,B. B. ; Deputy,G. O.

Report Date : JUL 1984

Pagination or Media Count : 15

Abstract : Direct ultrasonic evaluation of local variations in material composition is possible when these compositional variations induce measurable changes in the local elastic properties of microstructure of the material. In this study two standard classes of measurements are evaluated for their performance in the particular problem of quantitatively determining levels of interstitial oxygen contamination in titanium. The results of time-of-flight and frequency dependent attenuation measurements are presented for the case of finished flat titanium plates which have homogeneous interstitial oxygen contamination. These measurements were obtained using sensitive correlation techniques which were not required for these initial measurements, but which should prove beneficial in more practical contaminant situations. The applicability of such ultrasonic measurements are also examined for the case of more general inhomogeneous structures with rough surfaces. (Author)

Descriptors :   *Titanium, *Oxygen, *Contamination, *Ultrasonics, *Correlation techniques, Acoustic velocity, Acoustic attenuation, Elastic properties, Microstructure, Composition(Property), Welds, Fabrication, Metal plates, Reverberation, Signal to noise ratio, Ultrasonic tests, Shear properties, Grain boundaries

Distribution Statement : APPROVED FOR PUBLIC RELEASE