IP Library › Patent Application 14985515
Patent Application
App. No. 14/985,515

Turbine Blade, and Turbine Rotor and Steam Turbine Using the Turbine Blade

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Quick Facts
Patent No.
US None
App. No.
14/985,515
Abstract

Disclosed is a turbine blade including a turbine blade substrate including an iron-base alloy; an erosion shield plate including a Co-base alloy; and a shim including a Ni—Fe alloy, in which the erosion shield plate is fixed to a leading edge of the turbine blade substrate with the shim therebetween by an electron beam welding. Thus, a turbine blade having a highly reliable, bonded portion of an erosion shield, and a turbine rotor and a steam turbine using the turbine blade are provided.

Claims (19)

1 . A method for manufacturing a device which includes a turbine blade substrate including an iron-base alloy, an erosion shield plate including a Co-base alloy, and a shim including a Ni—Fe alloy, the method comprising:

fixing the erosion shield plate to the leading edge of the turbine blade substrate with the shim using a single pass of electron beam injection, wherein

the shim has a larger width on an electron-beam injection side than a width on a back side of the shim,

the shim being disposed in a groove between the leading edge of the turbine blade substrate and the erosion shield plate.

2 . The method according to claim 1 , wherein the shim has a trapezoidal shape when viewed in cross-section.

3 . The method according to claim 1 ,

wherein a thicknesses of a weld zone of the turbine blade substrate and the erosion shield plate at a section perpendicular to a radial direction of the turbine blade substrate are larger than a thickness of a main body of the turbine blade substrate at the section, and the thickness of the shim is equal to the thicknesses of the weld zone.

4 . The method according to claim 1 ,

wherein the shim is formed of a Ni—Fe alloy containing Ni of 70% or more.

5 . The method according to claim 1 wherein the device is a low-pressure turbine rotor.

6 . The method according to claim 5 wherein the device is a low pressure steam turbine.

7 . The method according to claim 6 wherein the device is a steam turbine generation plant.

8 . The method according to claim 2 ,

wherein a thicknesses of a weld zone of the turbine blade substrate and the erosion shield plate at a section perpendicular to a radial direction of the turbine blade substrate are larger than a thickness of a main body of the turbine blade substrate at the section, and the thickness of the shim is equal to the thicknesses of the weld zone.

9 . The method according to claim 2 , wherein the shim is formed of a Ni—Fe alloy containing Ni of 70% or more.

10 . The method according to claim 2 , wherein the device is a low-pressure turbine rotor.

11 . The method according to claim 10 , wherein the device is a low pressure steam turbine.

12 . The method according to claim 11 , wherein the device is a steam turbine generation plant.

13 . The method according to claim 11 , wherein the device is a turbine blade.