Accession Number : ADP004125

Title :   Acoustical Characterization of Ti-6211 Weldments and Oxygen Contamination Ti-6211 Plate,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Buxbaum,S. R. ; Green,R. E. , Jr

Report Date : JUL 1984

Pagination or Media Count : 25

Abstract : The use of ultrasonic testing for the inspection of weldments in titanium alloys requires careful acoustical characterization of the materials and weldments in question. In the first part of the present work various ultrasonic tests were conducted on a series of test specimens of titanium alloy weldments and base plate material. Ultrasonic wave velocity and attenuation measurements were made in the low megahertz frequency range using both longitudinal and shear waves. Both the ultrasonic wave velocity and attenuation were observed to be lower in the weld region than in the base metal. Information provided by x-ray analysis helped to account for the observed wave velocity behavior. Changes in the attentuation were correlated tto microstructural variations and hardness measurements in the weld region and base metal. The second stage of the research focused on the problem of dissolved gas contamination of Ti-6211 welded joints. In order to evaluate the feasibility of ultrasonic testing for detecting quantitatively the presence of interstitial gas contamination in weldments of Ti-6211, ultrasonic wave velocity and ultrasonic attenuation measurements were performed on a series of five specimens with nominal oxygen levels of 0.1, 0.2, 0.3, 0.4, and 0.5 percent by weight. Careful density measurements in addition to the ultrasonic wave velocity data enabled accurate determination of elastic moduli. (Author)

Descriptors :   *Titanium alloys, *Weldments, *Metal plates, *Oxygen, *Contamination, *Ultrasonic tests, Acoustic velocity, Acoustic attenuation, Microstructure, Hardness, Welded joints, Interstitial, Wave propagation, Shear properties, Nondestructive testing

Distribution Statement : APPROVED FOR PUBLIC RELEASE