Ultrasonic verification of microstructural changes due to heat treatmentUltrasonic attenuation was measured for polycrystalline samples of nickel and copper with various grain-size distributions produced by heat treatment. Attenuation as a function of frequency was determined for a sample having a known mean grain diameter. Once this function was determined, it could be scaled to determine the mean grain size of other samples of the same material with different mean grain diameters. These results were obtained by using broadband pulse-echo ultrasound in the 25 to 100 MHz frequency range. The results suggest an ultrasonic, nondestructive approach for verifying heat treatment of metals.
Document ID
19870023498
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Generazio, E. R. (NASA Lewis Research Center Cleveland, OH, United States)