Some surface treatments that apply to the hydraulic equipment components, which operated at high hydrodynamic loads, in which appear the phenomenon of erosion by cavitation, shall be listed and laser nitriding. Before that operation, the steel was undergone thermal annealing treatments for improving machinability cutting, followed by martensitic quenching and a tempering to high temperature. By changing the laser beam power are changes the layer thickness enriched in nitrogen and thus the resistance to erosion by cavitation. The cavitation tests, carried out in accordance with the requirements of ASTM G32-2010 standards, followed by hardness measurements with micro-hardness HV0.3 and optical and electronic metallographic investigations, justifies the increasing resistances to erosion by cavitation of nitrided layer, compared with the volume heat treatment.Keywords: Laser nitriding, erosion by cavitation, 34CrNiMo6 steel
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