Ultrasonic characterization of the effect of cold work and grain size in copper and 68:32 brass sheets

Abstract

The effectiveness of ultrasonic velocity measurements was evaluated as a means for nondestructive characterization of cold-rolled copper and 68:32 brass sheets. An apparatus was designed to generate and receive the zeroth symmetrical mode of ultrasonic Lamb waves in thin copper and brass sheets. The effect of angular variations in propagation direction with respect to the rolling direction on the measured Lamb wave velocities is shown. Interpretation of the variations of ultrasonic Lamb wave velocity were related to deformation mechanisms and texture development in copper and 68:32 brass sheets. Results show that the grain size and cold work influence the velocity as well as the texture of copper and 68:32 brass sheets. Results indicate the possibility of using ultrasonic Lamb wave velocity as a tool to monitor elastic anisotropy.

Ultrasonic Assessment of the Influence of Cold Rolling and Recrystallization Annealing on the Elastic Constants in a TWIP Steel

“…Ultrasound has been recognized as a nondestructive technique for inspection and material characterization; the measurement of ultrasound wave velocities has long been used to assess the elastic constants since they quantify a material’s resistance to specific elastic deformations and, as sound is a form of elastic wave that travels in a medium, the stiffness tensor contains information about how these acoustic waves behave [ 6 ]. Additionally, since ultrasonic properties are affected by variations in microstructure, such as the crystallographic orientation, grain size and microstructural defect density, monitoring the transmission or reflection of ultrasound provides information about the material structure and its mechanical properties [ 12 , 13 , 14 , 15 , 16 ].…”