TITANIUM ALUMINIDE ALLOY MATERIAL FOR HOT FORGING, AND METHOD FOR FORGING TITANIUM ALUMINIDE ALLOY MATERIAL

WIPO Patent Application WO/2020/189214

A1

This TiAl alloy material for hot forging has a chemical composition comprising, in terms of atomic ratio, 39.0% to 39.9% aluminum, 3.0% to 5.0% niobium, 3.0% to 4.0% vanadium, and 0.05% to 0.15% carbon, the remainder being titanium and unavoidable impurities. The TiAl alloy material may also optionally contain boron. In the present invention, the TiAl alloy material for hot forging is prepared and held at a temperature within the equilibrium temperature region of the β phase or the (β + α) phase in the TiAl alloy state diagram, and the TiAl alloy material is forged in a non-oxidizing atmosphere. The workability of the TiAl alloy material during hot forging is improved while the creep strength thereof is maintained, and high-speed forging of the TiAl alloy material is possible.

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KUBUSHIRO KEIJI (JP)
OTA YUTARO (JP)
USUI SHIN (JP)
TAKEYAMA MASAO (JP)
NAKASHIMA HIROTOYO (JP)

PCT/JP2020/007907

September 24, 2020

February 27, 2020

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IHI CORP (JP)
TOKYO INST TECH (JP)

B21J5/00; C22C14/00; C22F1/18; C22F1/00

WO2018043187A1	2018-03-08
WO2019123694A1	2019-06-27

JP2002356729A	2002-12-13
JPH0649689A	1994-02-22
JP2000345259A	2000-12-12
JP2010532822A	2010-10-14
JP2002356729A	2002-12-13
JP2008184665A	2008-08-14

See also references of EP 3943208A4

MIYOSHI Hidekazu et al. (JP)

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