Investigation of the stress reduction and temperature increase due to ultrasonic vibrations with different amplitudes during compression tests of steels with varying specimen sizes.

High-frequency vibrations in the ultrasonic range influence the plasticity of metals during metal forming: there is stress and force reduction during ultrasonic treatment compared to metal forming without ultrasound. Different reasons for this behavior are discussed: a combination of stress superposition, energy absorption in dislocations, temperature increase, and frictional changes. This investigation shows the influence of partially superimposed ultrasonic vibrations with amplitudes in the range of ∼ 1.