Abstract
Aging is a common problem around the world which occurs normally in high temperature applications such as in electricity generation power plants. In the present work gas turbine shrouds were used in the as-received (virgin) and three different artificially aged times. Ultrasonic testing parameters such as ultrasonic wave velocity and attenuation in the pulse-echo mode were used. Mechanical and microstructural tests resulting from different aging treatments were correlated with UT parameters. The loss in mechanical properties and the microstructural variation, using SEM, were detected as a function of different aging times. Among all samples, the longest aging time possessed lowest strength, attenuation and highest sound wave velocity whereas the virgin condition has highest strength, highest attenuation and lowest sound velocity.