Mitsubishi Heavy Industries Limited

Other

Toshimitsu Tetsui

Kentaro Shindo

Masao Takeyama

Takayuki Kawano

Teiichiro Saito

Tamao Takatsu

Kiyotaka Iwatsubo

Takashi Inami

Hideharu Kobayashi

Hiroshi Tsurusaki

Youzaburo Mabuchi

A TiAl based alloy having excellent strength as well as an improvement in toughness at room temperature, in particular an improvement in impact properties at room temperature, and a production method thereof, and a blade using the same are provided. This TiAl based alloy has a microstructure in which lamellar grains having a mean grain diameter of from 1 to 50 &#x3bc;m are closely arranged. The alloy composition is Ti-(42-48)Al-(5-10)(Cr and/or V) or Ti-(38-43)Al-(4-10)Mn. The alloy can be obtained by subjecting the alloy to high-speed plastic working in the cooling process, after the alloy has been held in an equilibrium temperature range of the &#x3b1; phase or the (&#x3b1;+&#x3b2;) phase.

TiA1 based alloy, production process therefor, and rotor blade using same

A TiAl based alloy having excellent strength as well as an improvement in toughness at room temperature, in particular an improvement in impact properties at room temperature, and a production method thereof, and a blade using the same are provided. This TiAl based alloy has a microstructure in which lamellar grains having a mean grain diameter of from 1 to 50 &mgr;m are closely arranged. The alloy composition is Ti-(42-48)Al-(5-10) (Cr and/or V) or Ti-(38-43)Al-(4-10)Mn. The alloy can be obtained by subjecting the alloy to high-speed plastic working in the cooling process, after the alloy has been held in an equilibrium temperature range of the &agr; phase or the (&agr;&plus;&bgr;) phase.

TiAl based alloy, production process therefor, and rotor blade using same

An object of the present invention is to provide a weld material which contains 8 to 13% Cr, and can be used with the GMA welding method, a GMA welding method which has superior arc stability and can provide a welded material having superior properties, and a welded structure; in order to attain this object, a weld material is provided, which contains in weight, 0.01 to 0.15% C, 0.1 to 0.6% Si, 0.1 to 2.0% Mn, 8 to 13% Cr, 0.1 to 1.5% Ni, 0.3 to 2.0% Mo, 0.05 to 0.5% V, 0.08 to 0.5% W, 0.5 to 5.0% Co, 0.1 to 0.5% Ta, &lE;0.08 N, 0.01 to 0.1% REMs, and consisting of the balance Fe with inevitable impurities.

Weld material, gas metal arc welding method, and welded structure

This invention relates to a TiAl intermetallic compound-based alloy exhibiting excellent heat resistance, oxidation resistance and resonance resistance and having a cast structure composed of fine equiaxed grains. Specifically, it relates to a TiAl intermetallic compound-based alloy comprising of 45 to 48 atomic percent of Al, 5 to 9 atomic percent of Nb, 1 to 2 atomic percent of Cr, 0.2 to 0.5 atomic percent of Si, 0.3 to 2 atomic percent of Ni, 0.01 to 0.05 atomic percent of Y, and the balance being Ti and incidental impurities, the alloy exhibiting excellent heat resistance, oxidation resistance and resonance resistance and having a cast structure formed of fine equiaxed grains.

TiAl intermetallic compound-based alloy

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Nagasaki, Japan

Toshimitsu Tetsui