| 摘要 |
PURPOSE:To prevent erosion of a wheel and generation of vibrations, by placing a single or plural layers of metals with intermediate values of erosion potential between those of turbine runners of a titanium alloy and a wheel of a low-grade alloy, at the portion connecting the runners and the wheel. CONSTITUTION:At the periphery of a wheel 1 of a turbine rotor, is formed a turbine runner installing member 1a with recessed portions of plural steps, to which are geared implanting portions 2a of the turbine runners 2. In such a composition, the surfaces in the implanting portion 2a contacting to the runner installing member 1a are fixed by plating in plural layers with pure metals 3 with intermediate erosion potential values between those of the turbine runners 2 and the wheel 1. The order of the erosion potentials is arranged increasing from the wheel 1, the plating metal layers 3a-3c, and the turbine runners 2 in this order. Therefore, generation of erosion of the wheel 1 during the steam turbine operation can be prevented.
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