Development of Fracture Toughness Measurement Capability by Ultrasound. Final Report

摘要

A correlation was developed between ultrasonic wave propagation factors and fracture toughness for Ti-6Al-6V-2Sn alloy. The important microstructural dimension for ultrasonic wave attenuation in this two-phase alloy appears to be the width of the beta phase between the needlelike alpha -phase subgrains. Test specimens must have flat and parallel surfaces and be coupled to the ultrasonic transducer by a thin, uniform couplant layer. Good impedance matching of the specimen-couplant-transducer combination to the ultrasonic pulser-receiver is necessary for obtaining acceptable echo waveforms. This technique is a research test and requires a very knowledgable operator for application to a two-phase metal. (ERA citation 81:026044)