Title:
TITANIUM ALUMINIDE ALLOY MATERIAL FOR HOT FORGING, FORGING METHOD FOR TITANIUM ALUMINIDE ALLOY MATERIAL, AND FORGED BODY
Document Type and Number:
WIPO Patent Application WO/2020/189215
Kind Code:
A1
Abstract:
This TiAl alloy material for hot forging has a chemical composition comprising, in terms of atomic ratio, 43.0-45.0% of Al, 4.0-6.0% of Nb, 1.5-3.5% of Cr, and a remainder of Ti and unavoidable impurities. In addition, the TiAl alloy material for hot forging may optionally contain boron. The TiAl alloy material for hot forging is prepared, the temperature is held within a phase equilibrium temperature range for one of the β phase, the (β+α) phase, and the (β+α+γ) phase indicated in the TiAl alloy phase diagram, and the TiAl alloy material is forged in a non-oxidizing atmosphere. First and second heat treatments are performed after forging. The present invention improves isothermal forgeability in a TiAl material and makes it possible to perform hot forging at a lower forging temperature.
Inventors:
KUBUSHIRO KEIJI (JP)
OTA YUTARO (JP)
TAKAHASHI SATOSHI (JP)
TAKEYAMA MASAO (JP)
NAKASHIMA HIROTOYO (JP)
YAMAGATA RYOSUKE (JP)
OTA YUTARO (JP)
TAKAHASHI SATOSHI (JP)
TAKEYAMA MASAO (JP)
NAKASHIMA HIROTOYO (JP)
YAMAGATA RYOSUKE (JP)
Application Number:
PCT/JP2020/007922
Publication Date:
September 24, 2020
Filing Date:
February 27, 2020
Export Citation:
Assignee:
IHI CORP (JP)
TOKYO INST TECH (JP)
TOKYO INST TECH (JP)
International Classes:
C22C14/00; B21J5/00; C22F1/18; C22F1/00
Foreign References:
| JPH08120372A | 1996-05-14 | |||
| CN103409660A | 2013-11-27 | |||
| JP2016166418A | 2016-09-15 | |||
| JP2015004092A | 2015-01-08 | |||
| JPH06116691A | 1994-04-26 | |||
| JPH05255781A | 1993-10-05 | |||
| JP2015004092A | 2015-01-08 | |||
| JP2009144247A | 2009-07-02 |
Other References:
See also references of EP 3943627A4
Attorney, Agent or Firm:
MIYOSHI Hidekazu et al. (JP)
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