Steam turbine rotor blade, method for manufacturing steam turbine rotor blade, and steam turbine
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United States of America
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Feb 25, 2020
Grant Date -
Sep 21, 2017
app pub date -
Nov 5, 2015
filing date -
Nov 5, 2015
priority date (Note) -
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Abstract
A steam turbine rotor blade for forming a turbine rotor cascade of a steam turbine includes a rotor blade main body having a blade portion, a blade base portion and a first coupling portion, which has first facing surfaces, provided on opposite end sides of the blade portion, and a second coupling portion provided in an intermediate portion of the blade portion and having second facing surfaces. The steam turbine rotor blade also includes a coating layer which is made of a Co-based alloy having a single composition on a surface of at least one of the first and second facing surfaces with a diffusion layer having a thickness of 10 μm or less provided between the coating layer and the surface.
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