Abstract

FeMnCrSi alloys have been developed and studied for the last years; with a focus on their cavitation resistance; and their use as coatings on CA6NM stainless steel hydraulic runners. With the focus on their cavitation resistance increase; some experiments were performed: chemical composition changes; use of different thermal spraying processes; ASP (Arc- Spraying Process); HVOF (High-Velocity Oxy-Fuel) with propylene and kerosene fuels; and HVAF (High-Velocity Air- Fuel); use of the welding process PTA (Plasma Transferred Arc); processes parameters optimization; and post-treatments; such as shot-peening; cold working; and PTA remelting. This work aims to present a compilation of previous articles published on the theme of the FeMnCrSi cavitation resistance coatings. One key point is the increase of particle velocity and decrease of oxidation in the coating; which promoted better results; highlighting the HVOF-kerosene process; with cavitation erosion rate of 1.69 mg•h–1. Regarding post-treatments; by a cold work on PTA FeMnCrSi coating; the cavitation resistance of 0.33 mg•h–1 was obtained.

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