Studies on resistance to erosion of nickel and its alloys to be used in elements of fluid - flow machines

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.