| 摘要 |
PROBLEM TO BE SOLVED: To improve rigidity, damping characteristics, and vibration stress by using long blades. SOLUTION: The bucket has blades 118 of which length is about 45 inches or more. The bucket 102 includes a dovetail part 121 disposed close to a radially inward position of the bucket, a tip shroud disposed close to a radially outward position of the bucket, and an intermediate span shroud 610 disposed at a radially intermediate position between the radially inward position and outward position. The bucket 102 is formed of titanium base alloy comprising aluminum by about 2-6.25 wt.%, vanadium by about 3.5 wt.% or less, tin by about 2.25 wt.% or less, zirconium by about 2.25 wt.% or less, molybdenum by about 1.75-5.0 wt.%, chrome by about 2.25 wt.% or less, silicon by about 0.7 wt.% or less, iron by about 2.3 wt.% or less, and titanium for the rest. COPYRIGHT: (C)2009,JPO&INPIT
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