Abstract
This article presents first results of the experimental investigation of the influence of the cavitation shot less peening process on the properties of stainless steel and aluminium alloy specimens. The cavitation field was generated by an ultrasonic horn submerged in water and operated by an ultrasonic generator. The temperature of the water was controlled by thermometer and adjusted by separate water cooling system. The mass loss, the mass loss rate and the modification of the surface hardness are evaluated for different cavitation exposure intervals. The mass loss was measured by micro weighing scale and the surface hardness by the micro-hardness meter. The presented results indicates the significant improvement in the surface hardness for both tested materials.
Highlights
In liquid systems the term cavitation usually refers to the formation and collapse of cavities in the free liquid or in the proximity of submerged surfaces
Due to undesirable effects connected to the cavitation erosion the term cavitation is mainly connected to the field of the hydraulic machinery [1]
The cavitation phenomena can be used in many industrial applications
Summary
In liquid systems the term cavitation usually refers to the formation and collapse of cavities in the free liquid or in the proximity of submerged surfaces. Due to undesirable effects connected to the cavitation erosion the term cavitation is mainly connected to the field of the hydraulic machinery [1]. The cavitation phenomena can be used in many industrial applications. One of these applications is the cavitation shotless peening. The cavitation shotless peening is a method used to improve the fatigue strength and to introduce compressive residual stresses to the metallic materials. The plastic deformation induces compressive stresses in the peened surface and tensile stresses within the material interior. The mechanical effects responsible for the cavitation erosion are produced mainly during the cavitation bubble collapse
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