Cavitation is a one of many wear mechanisms which are related to the flow of liquid. It is one of the most
destructive wear methods for stainless materials. The local changes in the pressure of the liquid stream related
to the flow across the metal component cause straightening of the surface area, as well as its erosion and the
formation of pits on the surface layer. The erosion value of cavitation is related to the material’s microstructure,
the geometry of the element, the phase composition of the material and the surface roughness. In this paper the
investigation of the cavitation process for duplex stainless steel has been performed. Samples examined in the
first stages of the experiments were not significantly changed, but after a long time the hardness increase was
very visible. The result of the cavitation was also cracking along the interphase boundaries, which resulted in the
chipping of the material. One of the most important results was a description of the change in the wear mechanisms and its intensity during the cavitation exposure time. At first plastic micro deformation of the material’s
surface occurred, then the plastic deformation increased significantly and after some time this resulted in erosion
of the material and interfacial boundary decohesion; these two effects increased simultaneously. The last of the
mechanisms was mechanical destabilization of the austenite, but the clear result of the mechanical destabilization of the austenite was only observed in the last sample. Martensitic transformation of the material changed
the material’s mechanical properties, but for the stainless steels this resulted in electrochemical corrosion of the
material, especially through the formation of an electrochemical potential between austenite and martensite.
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