Relaxation of residual stresses in ultrasonic treatment

Abstract

1. The application of heat treatment of products does not always cause effective reduction of residual elastic stresses whereas treatment with ultrasound at normal temperature ensures a sufficient degree of their relief. 2. The most likely mechanism of stress relief in ultrasonic treatment of parts of steel 40Kh13 is the shear mechanism whereas in thermal aging at 160–170°C it is the diffusional mechanism. 3. The optimal regime of ultrasonic treatment of parts is the action of ultrasound at normal temperature through oil for 5–60 sec.