Abstract: Cavitation wear resistance, of four different nickel-based alloy during the incubation
period was investigated with the use of stream-impact device and results are presented in this
paper. Four nickel alloys with excellent resistance corrosion very high corrosion resistance and
very good mechanical properties were selected for the tests: Monel 400, Inconel 600, Incoloy
800H and Hasteloy C22. Nickel alloys examined for the period of 600 minutes. Mechanism
of formation and destruction of the surface layer under working liquid influence is described.
It was noticed, that first microcracks are formed on the grain boundaries, especially in the triple
contact points. Effects of plastic strain were also noted on the surface of samples as a uplifting
and collapsing in boundary area. It was stated, that among nickel alloys examined, a better
resistance to cavitational erosion in initial period of cavitation damage has the alloys: Hasteloy
C22 and Incoloy 800H.
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