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AssigneeGeneral Electric Company
InventorsRaymond Joseph Stonitsch, Alan Richard Demania, Kevin Joseph Barb
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A new high-strength titanium-based alloy bucket specifically suited for use as the last stage buckets in steam turbine engines having vane lengths of about 40 inches or greater and the method for forming such bucket. Exemplary buckets according to the invention are formed from a titanium-based alloy containing up to about 6.25% aluminum; (b) about to 3.5% vanadium; (c) about 2.25% tin, (d) about 2.25% zirconium, (e) about 1.75% molybdenum, (f) about 2.25% chromium, (g) about 0.7% silicon; and (h) about 2.3% iron, with the balance being titanium. After forming, the bucket can be heat treated to provide stress relief and then machined in a conventional manner.
A bucket for use in the last stage of a steam turbine engine, said bucket being formed with a vane length of at least about 40 inches and comprising a titanium-based alloy having between about 3% and 6.25% by weight aluminum, up to 3.5% vanadium, up to 2.25% tin, up to 2.25% zirconium, between about 1.75% and 5.0% molybdenum, up to 2.25% chromium, up to 0.7% silicon and up to 2.3% iron, with the balance being titanium.
A titanium-based alloy composition for use in forming last stage steam turbine buckets having vane lengths of at least about 40 inches, said titanium-based alloy composition comprising between about 3% and 6.25% by weight aluminum, up to 3.5% vanadium, up to 2.25% tin, up to 2.25% zirconium, 1.75 to 5.0% molybdenum, about 2.25% chromium, between about 0.7% silicon and up to 2.3% iron, with the balance being titanium.
A method for manufacturing a last stage turbine bucket for use in a steam turbine engine, comprising the steps of:
Dependencies are inferred from the claim text.