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The paper highlights new aspects in the evaluation of cavitation erosion resistance based on the chromium content variation and implicit on the Cr/Ni equivalent which constitutes the microstructure development using the information given by the Schaeffler diagram. The presented and analysed results show that it is possible to establish an optimum relation between the chromium and nickel content, in order to obtain a substantial increase of the cavitation erosion resistance. For this purpose, four stainless steels used in manufacturing of machinery parts, heavily subject to cavitation such as hydraulic turbine runners and pump impellers, were analyzed from the point of view of cavitation erosion. The cavitation erosion behaviour was evaluated by the microstructure behaviour investigated through optic and electronic microscopy and by comparisons with the characteristic curves for reference steels.

Cavitation Erosion Behaviour of Stainless Steels with Constant Nickel and Variable Chromium Content