Non-destructive evaluation of the yield stress for low carbon steel by ultrasound measurements

Аннотация

The non-destructive evaluation method for yield stress assessment in low carbon steels based on ultrasonic measurements of the longitudinal and transversal velocities and the longi- tudinal attenuation coefficient is proposed. First, the mean grain size D is calculated from the measured acoustic parameters and then the yield strength is estimated from these three parameters using the Hall-Petch relationship. Comparative non-destructive and destructive tests for yield stress evaluation are elaborated. The results obtained allow to be concluded that the accuracy of non-destructive evaluation of s y is reliable enough.