Ultrasonic Criteria of Plastic Deformation and Fracture in Structural Metals.

In the present paper, the investigation results on the strain dependence of the Rayleigh wave velocity are presented. Plane dog-bone metal specimens were deformed by tension at a constant strain rate. The specimens were made of low-carbon steel with a carbon content of 0.1% (C10) and 0.2% (C22), martensitic stainless steel X40Cr13, and commercially pure titanium (CP Ti). Discontinuity points in the stress dependences of ultrasonic velocity and damping were found. These points are considered to be ultrasonic criteria for the stage change in the deformation process. [ABSTRACT FROM AUTHOR]