Determination of the residual life of long steam turbine blades, taking into account in-service degradation

Keywords

in-service material degradation, long steam turbine blade, residual life, mathematical model, corrosion-fatigue crack propagation.

Cite as

Andreikiv O. Ye., Dolinska I. Ya., and Skalskyi Т. V. Determination of the residual life of long steam turbine blades, taking into account in-service degradation. Physicochemical Mechanics of Materials. 2026. 62(3), 81-87.

Abstract

A computational model has been developed to assess the effect of material degradation on the residual life of a long steam turbine blade containing a corrosion-fatigue crack, subjected to axial tensile loading due to centrifugal forces and cyclic bending in the disk plane caused by variations in the steam outlet pressure from the nozzles. Analytical relationships describing the time variation of degradation parameters of 20Kh13 steel under corrosion-fatigue loading conditions are proposed. Its influence on the residual life of the blade made of 20Kh13 steel is evaluated.

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