On the Creep of High-Temperature Rotors in Steam Power Turbines

Abstract

Examples of creeping in long-running shafts of high-temperature rotors in power turbines are given. The creeping manifests itself in the form of a spiral-shaped deformation of the surface of the axial channel and, at the same time, as spiral-arranged flaws within the thickness of the shaft, detectable by the ultrasonic method. The forces and moments of forces acting on the rotor during its operation are considered, as well as their connection with detected operational defects. Criteria for the state of metal in a rotor with operational defects are discussed with the aim to assess its residual life and ensure its safe operation.