The article presents results of studies on metal resistance to erosive damage taking place under the influence of hydraulic cavitation. On the basis of earlier research, a hypothesis on fatigue character of erosive wear and a dependence of metal resistance to
erosive damage on its crystalline lattice structure has been assumed. To verify this hypothesis, metals with different crystalline
lattice structures like steel 45 (flat-centred structure), nickel 200/201 and nickel alloy Monel 400 (hexagonal structure) have been
tested at a cavitation-strike stand. Results obtained there confirmed the assumed hypothesis, at the same time justifying the use of
nickel protective coatings in fluid-flow machines.
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