Steam Turbine and Surface Treatment Method Therefor

摘要

Provided is a steam turbine and a surface treatment method for the steam turbine with which high resistance to environmentally assisted cracking is achieved while also inhibiting the decrease in the effect of compressive residual stress given by shot peening and the complication of the process/treatment. A compressive stress layer to which compressive residual stress has been given by means of shot peening is formed at the surface of a structure (engagement part between a rotor and rotor blades) constituting the steam turbine. Further, a coating layer is formed to cover the surface of the compressive stress layer by means of plating.

主权项

1. A steam turbine comprising:
a compressive stress layer to which compressive residual stress has been given by means of shot peening at the surface of a structure constituting the steam turbine; and a coating layer formed to cover the surface of the compressive stress layer by means of plating.