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Ultrasonic cavitation peening produces shallow depths of peening ideal for components of thin section. With the component submerged in deionized water, the process creates microscopic bubbles beneath a pad during the ultrasonic rarefication stroke. The bubbles then asymmetrically collapse during the compression stroke. This asymmetric collapse creates an intense local water jet resulting in plastic deformation of the surface. Because the bubbles are small, the depth of plastic response is on the order of 100 microns (0.004 inches). This shallow depth is ideal for improving the fatigue life of components of thin cross section.

Ultrasonic Cavitation Peening
Nonsymmetric collapse of cavitation bubbles creates intense water jet with locally yielding pressure that peens the component surface

Benefits of Cavitation Peening

  • Shallow depth of residual compressive stress for thin delicate components that are required in operation to oscillate or cycle.
  • High cycle, low stress situations (HCF) in a deteriorating surface environment.
  • Enables peening of components too thin for shot or laser peening.
  • Ultra-clean processing enables applications where contamination cannot be tolerated.
  • CNC process control results in high processing repeatability and quality control.

Applications of Cavitation Peening.

Cavitation peening has applications in the electronics, automotive and aerospace industries specifically in the ever-expanding world of automated control by small and miniature components.


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