Corrosion Fatigue Analysis in Power Steam Turbine Blade

The corrosion fatigue behavior of a martensitic stainless steel AISI 410 with 12% Cr, used in the fabrication steam turbine blades at low pressure (L-P), was studied using electrochemical noise technique (EN) under mechanical (immersion and aired) conditions. tests were done simulated environment four levels stress (Δσ) 3 wt.% NaCl solution 90 °C. specimens underwent pitting when exposed to corrosive environment; afterwards, such pits generated strength sites over metallic surface, facilitating initiation propagation cracks, which already enhanced by applied cyclic loads. From scanning electron microscope (SEM) images, it possible observe localized plastic deformation. In instances, damage caused microplasticity (μ), i.e., shear strength, resulting from breakdown passive layer that subjected load, led significant increment velocity crack propagation, therefore, decrement useful life material. obtained results show resistance limit medium lower than observed aerated conditions due sum effects corrosion.