Title:
TIAL ALLOY PRODUCTION METHOD AND TIAL ALLOY
Document Type and Number:
WIPO Patent Application WO/2020/235203
Kind Code:
A1
Abstract:
This TiAl alloy production method comprises: a casting step in which a TiAl alloy starting material is melted and casted, the TiAl alloy starting material containing 42 at% to 45 at% Al, 3 at% to 6 at% Nb, 3 at% to 6 at% V, and 0.1 at% to 0.3 at% B, with the remainder comprising Ti and unavoidable impurities; a hot forging step in which the cast TiAl alloy is heated to a temperature in the range of 1200°C to 1350°C and subjected to hot forging; and a heat treating step in which the hot-forged TiAl alloy is subjected to a first heat treatment by keeping the alloy at a temperature in the range of 1220°C to 1300°C for 1 to 5 hours, after the first heat treatment the alloy is cooled to a temperature in the range of 1000°C to 1100°C at a cooling speed of at least 400°C/hour, the alloy is then subjected to a second heat treatment by keeping the alloy at a temperature in the range of 1000°C to 1100°C for 1 to 4 hours, and after the second heat treatment the alloy is rapidly cooled.
Inventors:
KUBUSHIRO KEIJI (JP)
Application Number:
PCT/JP2020/012032
Publication Date:
November 26, 2020
Filing Date:
March 18, 2020
Export Citation:
Assignee:
IHI CORP (JP)
International Classes:
B21J1/06; B21J5/00; C22C1/00; C22C14/00; C22F1/18; B21K3/04; C22F1/00
Domestic Patent References:
| WO2018043187A1 | 2018-03-08 |
Foreign References:
| JPH0776745A | 1995-03-20 | |||
| JPH10156473A | 1998-06-16 |
Other References:
See also references of EP 3974081A4
Attorney, Agent or Firm:
MIYOSHI Hidekazu et al. (JP)
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