Kabushiki Kaisha Toyota Chuo Kenkyusho

Toyota Jidosha Kabushiki Kaisha

Kazuaki Nishino

Takashi Saito

Tadahiko Furuta

Hiroyuki Kawaura

JungHwan Hwang

Hiroshi Kawahara

Hirofumi Ito

Nobuaki Suzuki

Hiroyuki Takamiya

Harumi Ueno

Takamichi Ueda

Takashi Maeshima

Hiroyuki Mori

Toshio Horie

Yoshikazu Genma

Yoji Awano

Ken-ichi Suzuki

Yoshiki Seno

Gaku Kitahara

Nobuhiko Matsumoto

Takumi Hijii

Masami Suzuki

Isamu Ueda

Rong Chen

Shigeru Kuramoto

Hideaki Ikehata

Hitomi Hirai

Mitsufumi Ito

Takuo Ito

Satosi Kato

Hidenori Yamaoka

Provided is austenitic heat-resisting cast steel that is excellent in both of the heat resistance and the machinability. Austenitic heat-resisting cast steel, includes: C: 0.1 to 0.4 mass %; Si: 0.8 to 2.5 mass %; Mn: 0.8 to 2.0 mass %; S: 0.05 to 0.30 mass %; Ni: 5 to 20 mass %; N: 0.3 mass % or less; Zr: 0.01 to 0.20 mass %; Ce: 0.01 to 0.10 mass %; one type or more of the elements selected from the following groups of (i) to (iii), at least including (i), (i) Cr: 14 to 24 mass %, (ii) Nb: 1.5 mass % or less, and (iii) Mo: 3.0 mass % or less; and Fe and inevitable impurity as a remainder.

Austenitic heat-resisting cast steel

Provided is austenite heat-resisting cast steel with reduced precipitation of ferrite phase during the application of thermal load to stabilize the austenite structure for improved heat resistance. The austenite heat-resisting cast steel contains elements of 0.1 to 0.6 mass % of C, 1.0 to 2.5 mass % of Si, 1.0 to 3.5 mass % of Mn, 0.05 to 0.2 mass % of S, 14 to 24 mass % of Cr, 5 to 20 mass % of Ni, 0.1 to 0.3 mass % of N, 0.01 to 1.2 mass % of Zr, 0.01 to 1.5 mass % of Cu, 0.01 to 1.5 mass % of Nb, Fe as a remainder and unavoidable impurity. The elements satisfy the following expressions:Mn&#x2014;S&#x2267;1.0; andC&#x2212;(1/12Cr&#x2212;32Zr)&#x3e;0,

Austenite heat-resisting cast steel

There is provided an electron conductive and corrosion-resistant materialcontaining titanium (Ti), boron (B) and nitrogen (N) in an atomic ratio satisfying 0.05&#x2266;[Ti]&#x2266;0.40, 0.20&#x2266;[B]&#x2266;0.40, and 0.35&#x2266;[N]&#x2266;0.55 (provided that [Ti]+[B]+[N]=1). Further, there is provided a method of manufacturing an electron conductive and corrosion-resistant material, wherein boron nitride powder adheres to the surface of a substrateof which at least the surface is made of titanium or a titanium alloy, and is then heated. Furthermore, there is provided a method of manufacturing an electron conductive and corrosion-resistant material, wherein the surface of a substrateof which at least the surface is made of titanium or a titanium alloy is borided and then heated. In addition, there is provided a method of manufacturing an electron conductive and corrosion-resistant material, wherein a TiBlayer formed of TiBparticles is formed by spraying TiBpowder onto a metal substrateand then nitriding the TiBlayer.

Metal separator for fuel cell and method for producing the same

A high-strength titanium alloy of the present invention includes Ti as a major component, 15 to 30 at % Va group element, and 1.5 to 7 at % oxygen (O) when the entirety is taken as 100 atomic % (at %), and its tensile strength is 1,000 MPa or more. Overturning the conventional concept, regardless of being high oxygen contents, it has been possible to achieve the compatibility between the high strength and high ductility on a higher level.

High-strength titanium alloy and method for production thereof

A titanium alloy includes at least one alloying element whose molybdenum equivalent 'Mo' is from 3 to 11% by mass, at least one interstitial solution element selected from the group consisting of O, N and C in an amount of from 0.3 to 3% by mass, and the balance of Ti, when the entirety is taken as 100% by mass. Its content of Al is controlled to 1.8% by mass or less, and it is &#x3b2; single phase at room temperature at least.

Titanium alloy and process for producing the same

A titanium alloy obtained by a cold-working step, in which 10% or more of cold working is applied to a raw titanium alloy, comprising a Va group element and the balance of titanium substantially, and an aging treatment step, in which a cold-worked member, obtained after the cold-working step, is subjected to an aging treatment so that the parameter 'P' falls in a range of from 8.0 to 18.5 at a treatment temperature falling in a range of from 150&#xb0; C. to 600&#xb0; C.; and characterized in that its tensile elastic limit strength is 950 MPa or more and its elastic deformation capability is 1.6% or more. This titanium alloy is of high elastic deformation capability as well as high tensile elastic limit strength, and can be utilized in a variety of products extensively.

Titanium alloy having high elastic deformation capacity and method for production thereof

A titanium alloy member is characterized in that it comprise 40% by weight or more titanium (Ti), a IVa group element and/or a Va group element other than the titanium, wherein a summed amount including the IVa group element and/or the Va group element as well as the titanium is 90% by weight or more, and one or more members made in an amount of from 0.2 to 2.0% by weight and selected from an interstitial element group consisting of oxygen, nitrogen and carbon, and that its basic structure is a body-centered tetragonal crystal or a body-centered cubic crystal in which a ratio (c/a) of a distance between atoms on the c-axis with respect to a distance between atoms on the a-axis falls in a range of from 0.9 to 1.1. This titanium alloy member has such working properties that conventional titanium alloys do not have, is flexible, exhibits a high strength, and can be utilized in a variety of products.

Titanium alloy member

A titanium alloy according to the present invention is characterized in that it comprises an element of Va group (the vanadium group) in an amount of 30-60% by weight and the balance of titanium substantially, exhibits an average Young's modulus of 75 GPa or less, and exhibits a tensile elastic limit strength of 700 MPa or more. This titanium alloy can be used in a variety of products, which are required to exhibit a low Young's modulus, a high elastic deformability and a high strength, in a variety of fields.

Titanium alloy and method for producing the same

The invention relates to TiAl-base alloys with excellent oxidation resistance, and a method for producing the same. The TiAl-base alloy of the invention comprises a substrate and a surface part formed on the substrate, the surface part comprising at least one element of Cr, Nb, Ta and W and having a surface condition capable of forming a dense film of an oxide of the element or Al O in high-temperature oxidizing atmospheres. The method of the invention comprises heating a TiAl-base alloy material having an Al content of from 15 at. % to 55 at. % in the presence of an oxide having a smaller negative value of standard free energy of formation than that of alumina. The method of the invention provides TiAl-base alloys with excellent oxidation resistance.

Tial-based alloys with excellent oxidation resistance, and method for producing the same

The invention provides a method of producing an oxidation-resistant metallic part which exhibits oxidation resistance even in an oxidation atmosphere. The method includes the step of applying mechanical energy to a surface of a metallic part in the presence of particulates, and forming a protective coating in a surface of the metallic part. When the metallic part thus treated is exposed in a high temperature-oxidation atmosphere, the protective coating is oxidized to restrain the proceeding of the oxidation of the metallic part, that is the internally proceeding formation of TiO,, thus serving a remarkable improvement of the oxidation resistance.

Method of producing a metallic part exhibiting excellent oxidation resistance

Surface-treating metallic parts are produced by applying mechanical energy to the surface of a metallic part and to a substance on or near the surface of the metallic part. The substance is different from the metallic part in composition. The applying step forms a mechanically-alloyed layer from the metallic part and the substance in the surface of the metallic part. The surface-modified layer such as the mechanically-alloyed layer is a non-peeling alloyed layer having a composition or structure different from that of the metallic part. The method is effective in surface-treating light metal materials of which the surfaces are difficult to treat. For example, the method is applicable to soft Mg alloys and Al alloys to improve their surface hardness, and the thus-treated alloys are usable in slide parts which are required to have good wear resistance. It is also applicable to the improvement in the oxidation resistance of Ti alloy parts which are used at high temperatures, and to the improvement in the corrosion resistance of Mg alloys which are said to have poor corrosion resistance.

Surface-treated metallic part and processing method thereof

A ferritic heat-resistant cast steel includes C in an amount of from 0.1 to 0.4% by weight, Si in an amount of from 0.5 to 2.0% by weight, Mn in an amount of 1.0% by weight or less, S in an amount of from 0.06 to 0.20% by weight, Ni in an amount of 1.0% by weight or less, Cr in an amount of from 13 to 20% by weight, V in an amount of from 0.2 to 1.0% by weight, at least one element selected from the group consisting of Nb in an amount of from 0.1 to 0.4% by weight, Mo in an amount of from 0.1 to 2.0% by weight, and W in an amount of from 0.2 to 4.0% by weight, and the balance of Fe and inevitable impurities, the S being dispersed as sulfides in the ferritic heat-resistant cast steel. It can further include at least one element selected from the group consisting of Te in an amount of from 0.01 to 0.1% by weight and Al in an amount of from 0.01 to 0.5% by weight. It can be produced by melting and casting the alloying elements and thereafter by annealing the resulting cast product at a temperature of from 750.degree. to 1,000.degree. C.

Ferritic heat-resistant cast steel and process for producing the same

A heat-resistant alloy having excellent properties at high temperatures and useful for producing exhaust valves, comprises, in weight %, not more than 0.10% C, not more than 2.0% Si, not more than 2.0% Mn, from 35 to 50% Ni, from 17 to 25% Cr, from 3.2 to 5% Mo, from 2.0 to 3.2% Ti, from 0.5 to 1.5% Al, with the balance consisting essentially of Fe, wherein the weight ratio of Ti/Al is not more than 5/1. The alloy may further comprise at least one of B, Ca, and Mg, and/or at least one of Nb and Ta.

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Aichi, Japan

Kazuaki Nishino