Mitsubishi Hitachi Power Systems, Ltd.

Yuki Enomoto

Soichiro Tabata

Keita Kimura

Naoto Tochitani

Takayuki Kurimura

Naotoshi Okaya

Tatsuya Furukawa

Shunji Imai

Yuta Okimori

Haruhiko Asaka

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 &#x3bc;m or less provided between the coating layer and the surface.

Steam turbine rotor blade, method for manufacturing steam turbine rotor blade, and steam turbine

A turbine-blade retaining structure in which deformation of end portions of locking pieces exposed through an insertion window portion in the axial direction is prevented, and the occurrence of a crack in a welded portion is prevented. At least one of the end portions of adjacent locking pieces exposed through the insertion window portion is provided with a thick-plate portion that expands in the disc-thickness direction so as to be inside the insertion window portion.

Turbine-blade retaining structure and rotary machine having the same

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Kanagawa, Japan

Yuki Enomoto