Effect of electrolytic-plasma treatment on physico-chemical state surface and mechanical properties of steam turbine blades STEEL 20X13

M.K. Smislova, D.R. Tamindarov, A.B. Samarkina

The paper studies the influence of electrolytic-plasma polishing blades of steel 20X13 on physico-chemical state of the surface. It is known that the performance characteristics of blades pas rovyh turbines, such as fatigue strength and corrosion resistance, depends on many factors and are largely determined by physical and chemical state of the surface and micro-geometry, formed on the finishing operations of manufacturing. It is shown that in addition to reducing the surface roughness (up to grade 12), the result of electrolytic-plasma polishing is-are: increasing the fatigue limit, increasing the corrosion potential, increased micro-hardness of the samples. The observed effects can be attributed to a modification proceeding on the surface - the formation of a modified surface layer with a high (compared to the base) chromium content..

Key words: finishing, electrolytic-plasma polishing, mechanical properties.