公开(公告)号：US11131010B2

公开(公告)日：2021-09-28

申请号：US16092401

申请日：2017-04-13

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE ,  CITIZEN WATCH CO., LTD

Inventor： Toshimitsu Tetsui ,  Masahiro Satoh ,  Takayuki Ogawa

IPC: C22C14/00 ,  C22F1/18 ,  C22F1/00

Abstract: A titanium alloy of the present invention includes aluminum at a ratio of 28.0 at % or more and 38.0 at % or less, iron at a ratio of 2.0 at % or more and 6.0 at % or less, and titanium and inevitable impurities as the balance or includes aluminum at a ratio of 28.0 at % or more and 38.0 at % or less, manganese at a ratio of 4.0 at % or more and 8.0 at % or less, and titanium and inevitable impurities as the balance. Further, the titanium alloy of the present invention may include silicon at a ratio of 0.3 at % or more and 1.5 at % or less.

公开(公告)号：US10208360B2

公开(公告)日：2019-02-19

申请号：US14898257

申请日：2014-06-02

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Toshimitsu Tetsui

IPC: C22C14/00 ,  C21D9/00 ,  C22C30/00 ,  C22F1/18 ,  C22F1/04 ,  C21D8/00 ,  F01D5/28 ,  C22F1/00

Abstract: Provided is a hot-forged TiAl-based alloy of the present invention containing 40 to 45 atom % of Al and additive elements in the following composition ratio (A) or (B), and the balance Ti with inevitable impurities: (A) Nb: 7 to 9 atom %, Cr: 0.4 to 4.0 atom %, Si: 0.3 to 1.0 atom %, and C: 0.3 to 1.0 atom %; and (B) at least one of Cr: 0.1 to 2.0 atom %, Mo: 0.1 to 2.0 atom %, Mn: 0.1 to 4.0 atom %, Nb: 0.1 to 8.0 atom %, and V: 0.1 to 8.0 atom %. The TiAl-based alloy is characterized by having a fine structure of densely arranged lamella grains that are laminated alternately with a Ti3Al phase (α2-phase) and a TiAl phase (γ-phase) and have an average grain size of 1 to 200 μm.

公开(公告)号：US11920219B2

公开(公告)日：2024-03-05

申请号：US17311866

申请日：2019-12-13

Applicant: National Institute for Materials Science

Inventor： Toshimitsu Tetsui

IPC: C22C14/00 ,  B23P15/02 ,  C22F1/18

CPC classification number: C22C14/00 ,  B23P15/02 ,  C22F1/183

Abstract: The present invention provides a TiAl-based alloy, including: Al: 41 to 43 at %; Fe: 0 to 2.5 at %; Ni: 0 to 2.5 at %; Mo: 0 to 2.0 at %; W: 0 to 2.0 at %; Cr: 0 to 4.5 at %; Mn: 0 to 5.5 at %; V: 0 to 10 at %; Nb: 0 to 10 at %; C: 0.3 to 0.7 at %; and a remainder consisting of Ti and inevitable impurities, in which an alloy element parameter “P=(41.5−Al)/3+Fe+Ni+Mo+W+0.5 Cr+0.4 Mn+0.2 V+0.2 Nb—C” is in a composition range of 1.1 to 1.9, and the TiAl-based alloy has a microstructure consisting of a γ phase of 5 to 30 area %, a β phase of 0.5 to 5 area %, and a lamellar structure occupying a remaining part.