Abstract
In order to develop ultrasonic techniques for estimating the properties degradation of high temperature materials, a number of Cr-Mo-V steel samples were heat-treated, and their microstructural changes were examined. Ultrasonic parameters such as velocity, attenuation, and more recently developed nonlinear acoustic parameter were measured. The nonlinear acoustic parameter was found to be most sensitive to material degradation mainly attributed to the precipitation of impurities in the grain boundaries. There existed a relatively good correlation between the nonlinear parameter and the fracture appearance transition temperature (FATT) obtained by Charpy V-notch impact test. Based on the relationship between the FATT and the fracture toughness (KIC), the correlation between the nonlinear parameter and KIC was established.
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