Ihi Corporation

Tokyo Institute of Technology

Keiji Kubushiro

Satoshi Takahashi

Mitsutoshi Watanabe

Hiroyuki Ochiai

Hiroki Yoshizawa

Yutaro Ota

Masanobu Baba

Masao Takeyama

Yukihiro Shimoda

Hidemi Ukai

Yohei Sakakibara

Shin Usui

Hirotoyo Nakashima

Kyouhei Nomura

Watanabe Mitsutoshi

A method of manufacturing a TiAl alloy includes a casting step of melting and casting a TiAl alloy raw material which contains 42 at % or more and 45 at % or less of Al, 3 at % or more and 6 at % or less of Nb, 3 at % or more and 6 at % or less of V, 0.1 at % or more and 0.3 at % or less of B, and the balance being Ti and inevitable impurities, a hot forging step of hot forging the cast TiAl alloy by heating the cast TiAl alloy to a temperature range between 1200° C. or higher and 1350° C. or lower, and a thermal treatment step of holding the hot-forged TiAl alloy at a temperature range between 1220° C. or higher and 1300° C. or lower for a hour range between 1 hour or longer and 5 hours or shorter, applying a first thermal treatment to the hot-forged TiAl alloy, cooling the TiAl alloy subjected to the first thermal treatment to a temperature range between 1000° C. or higher and 1100° C. or lower at a cooling rate of 400° C./hour or more, holding the TiAl alloy subjected to the first thermal treatment at a temperature range between 100 ° C. or higher and 1100° C. or lower for a hour range between 1 hour or longer and 4 hours or shorter, applying a second thermal treatment to the TiAl alloy subjected to the first thermal treatment, and rapidly cooling the TiAl alloy subjected to the second thermal treatment.

Method of manufacturing TiAl alloy and TiAl alloy

A titanium aluminide alloy material for hot forging has a chemical composition including, by atom, aluminum of 38.0% or greater and 39.9% or less, niobium of 3.0% or greater and 5.0% or less, vanadium of 3.0% or greater and 4.0% or less, carbon of 0.05% or greater and 0.15% or less, and titanium and an inevitable impurity as a residue.

Titanium aluminide alloy material for hot forging and forging method for titanium aluminide alloy material

A TiAl alloy member for hot forging includes a substrate made of TiAl alloy, and an Al layer formed on a surface of the substrate, the Al layer containing Al as a main constituent and containing Ti.

TiAl alloy member, method of manufacturing the same, and method of forging TiAl alloy member

A TiAl alloy for forging, contains 41 at % or more and 44 at % or less of Al, 4 at % or more and 6 at % or less of Nb, 4 at % or more and 6 at % or less of V, 0.1 at % or more and 1 at % or less of B, and the balance being Ti and inevitable impurities.

TiAl alloy and method of manufacturing the same

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Tokyo, Japan

Keiji Kubushiro