Mitsubishi Heavy Industries Limited

Tokyo Institute of Technology

Jfe Steel Corporation

Ihi Corporation

Mitsubishi Hitachi Power Systems, Ltd.

Martin Marietta Energy Systems, Inc.

Masao Takeyama

Kentaro Shindo

Toshimitsu Tetsui

Masahiro Yoshida

Shinya Imano

Hiroki Nakamaru

Satoru Ando

Chain T Liu

Tatsuo Sato

Hironori Kamoshida

Sachiko Suzuki

Sakae Fujita

Keiji Kubushiro

Toshio Maruyama

Yutaro Ota

Shin Usui

Hirotoyo Nakashima

Tooru Tsuru

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

Provided herein are an austenite steel that satisfies desirable strength and desirable castability at the same time, and an austenite steel casting using same. The austenite steel according to an embodiment of the present invention contains Ni: 25 to 50%, Nb: 3.8 to 6.0%, Zr: 0.5% or less, B: 0.001 to 0.05%, Cr: 12 to 25%, Ti: 1.6% or less, Mo: 4.8% or less, and W: 5.2% or less in mass %, and the balance Fe and unavoidable impurities, wherein the parameter Ps represented by the following formula (1) satisfies Ps&#x2264;38,Ps=8.3[Nb]&#x2212;7.5[Ti]+2.4[Mo]+3.5[W]&#x2003;&#x2003;formula (1),where [Nb], [Ti], [Mo], and [W] represent the contents of Nb, Ti, Mo, and W, respectively, in mass %.

Austenite steel, and austenite steel casting using same

An aluminum or aluminum alloy-coated steel material includes base steel; and a coating layer formed on a surface of the base steel and containing by mass % Mg: 6% to 10%, Si: 3% to 7%, Fe: 0.2% to 2%, Mn: 0.02% to 2%, and the balance as Al and incidental impurities, wherein the coating layer has pseudoternary eutectic microstructures of &#x3b1;Al&#x2014;MgSi&#x2014;(Al&#x2014;Fe&#x2014;Si&#x2014;Mn) and an area ratio of the pseudoternary eutectic microstructures in the coating layer is at least 30%.

Aluminum or aluminum alloy-coated steel material and method of manufacturing the 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 &#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

The specification discloses chromium-niobium alloys which exhibit improved mechanical properties at high temperatures in the range of 1250.degree. C. and improved room temperature ductility. The alloys contain a Cr.sub.2 Nb-rich intermetallic phase and a Cr-rich phase with an overall niobium concentration in the range of from about 5 to about 18 at. %. The high temperature strength is substantially greater than that of state of the art nickel-based superalloys for enhanced high temperature service. Further improvements in the properties of the compositions are obtained by alloying with rhenium and aluminum; and additional rare-earth and other elements.

Two-phase chromium-niobium alloys exhibiting improved mechanical

Growing community of inventors

Tokyo, Japan

Masao Takeyama