US 2001/0022946 A1 · TiAl based alloy, production process therefor, and rotor blade using same

Abstract

A TiAl based alloy having excellent strength as well as an improvement in toughness at room temperature, in particular an improvement in impact properties at room temperature, and a production method thereof, and a blade using the same are provided. This TiAl based alloy has a microstructure in which lamellar grains having a mean grain diameter of from 1 to 50 μm are closely arranged. The alloy composition is Ti-(42-48)Al-(5-10) (Cr and/or V) or Ti-(38-43)Al-(4-10)Mn. The alloy can be obtained by subjecting the alloy to high-speed plastic working in the cooling process, after the alloy has been held in an equilibrium temperature range of the α phase or the (α+β) phase.

Claims19

Dependent claims

A TiAl based alloy having a microstructure in which lamellar grains having a mean grain diameter of from 1 to 50 μm are closely arranged, with an α2 phase and a γ phase being laminated therein alternately.

Dependencies are inferred from the claim text.

Facts

Application

09/789,540Filed 22 Feb 2001

Priority

JP 2000-04654023 Feb 2000

Published

20 Sep 2001

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

B21J 1/025
Preliminary treatment of metal stock without particular shaping, e.g. salvaging segregated zones, forging or pressing in the rough: affecting…
B21K 3/04
Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like: blades, e.g. for turbines; Upsetting of…
C22C 14/00
Alloys based on titanium
C22C 21/00
Alloys based on aluminium

TiAl based alloy, production process therefor, and rotor blade using same

Life of this patent

TiAl based alloy, production process therefor, and rotor blade using same

Life of this patent

Abstract

Claims19