Evaluation of the Reliability and Sensitivity of NDT Methods for Titanium Alloys.

摘要

The report describes the work conducted on a program designed to improve nondestructive testing techniques and, then, to evaluate the capability and reproducibility of the improved nondestructive testing techniques for the evaluation of discontinuities occurring in titanium. Reported are penetrant dwell times, penetrant bleed-out times, developer types, emulsification times, and water washing parameters required to effectively penetrant inspect parts which may contain a variety of crack sizes and porosity. Both post-emulsifiable and water washable fluorescent penetrants were investigated. The effect of kilovoltage on radiographic contrast sensitivity is discussed. Ultrasonic inspection of contour surfaces is reported and methods for improving near-surface resolution are documented. Methods for ultrasonic inspection of thin machined parts are reported.