US 12,221,683 B2
Titanium aluminide alloy material for hot forging and forging method for titanium aluminide alloy material
Keiji Kubushiro, Tokyo (JP); Yutaro Ota, Tokyo (JP); Shin Usui, Tokyo (JP); Masao Takeyama, Tokyo (JP); and Hirotoyo Nakashima, Tokyo (JP)
Assigned to IHI Corporation, Tokyo (JP); and TOKYO INSTITUTE OF TECHNOLOGY, Tokyo (JP)
Filed by IHI Corporation, Tokyo (JP); and TOKYO INSTITUTE OF TECHNOLOGY, Tokyo (JP)
Filed on Sep. 15, 2021, as Appl. No. 17/447,714.
Application 17/447,714 is a continuation of application No. PCT/JP2020/007907, filed on Feb. 27, 2020.
Claims priority of application No. 2019-049749 (JP), filed on Mar. 18, 2019.
Prior Publication US 2022/0002854 A1, Jan. 6, 2022
Int. Cl. C22F 1/18 (2006.01); B21J 5/00 (2006.01); C22C 14/00 (2006.01)
CPC C22F 1/183 (2013.01) [B21J 5/00 (2013.01); C22C 14/00 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A titanium aluminide alloy material for hot forging having a chemical composition, comprising: aluminum of 38.0 atomic % or greater and 39.9 atomic % or less, niobium of 3.0 atomic % or greater and 5.0 atomic % or less, vanadium of 3.0 atomic % or greater and 4.0 atomic % or less, carbon of 0.05 atomic % or greater and 0.15 atomic % or less, and titanium and an inevitable impurity,
wherein
the titanium aluminide alloy material has a metallographic structure comprising crystalline grains of lamellar structure, crystalline grains of γ-phase, and crystalline grains of β-phase.