Nissan Motor Company Limited

Kobe Steel, Ltd.

Daido Steel Co., Ltd.

Kumamoto University

Other

Yoshio Okada

Tomonori Miyazawa

Sadayuki Nakamura

Yoshihito Kawamura

Michiaki Yamasaki

Koji Itakura

Mamoru Nakata

Yuuichi Yamada

Takashi Matsumoto

Hideaki Kawata

Akira Fujiki

Jun Yoshida

Koichiro Hayashi

Masashi Yamaguchi

Kunio Maki

Hiroki Fujitsuka

Takahiro Mibe

Makoto Yoshida

Koichiro Inoue

Shin Nomura

Junpei Ogawa

Jun Ikeuchi

Hideki Muramatsu

Hidetoshi Satou

Wataru Naitou

Hideaki Ohtaka

Noriyuki Shiwaku

Kouji Itakura

Koji Koyanagi

Atsumi Hatano

The present invention provides a magnesium alloy material, having superior mechanical properties without using special production equipment or processes, and a production process thereof. The magnesium alloy material of the present invention composed of an Mg&#x2014;Zn&#x2014;RE alloy comprises essential components in the form of 0.5 to 3 atomic percent of Zn and 1 to 5 atomic percent of RE, with the remainder comprising Mg and unavoidable impurities. The Mg&#x2014;Zn&#x2014;RE alloy has a lamellar phase formed from a long period stacking ordered structure and &#x3b1;-Mg in the alloy structure thereof. The long period stacking ordered structure has at least one of a curved portion and a bent portion and has a divided portion in at least a portion thereof. Finely granulated &#x3b1;-Mg having a mean particle diameter of 2 &#x3bc;m or less is formed in the divided portion.

Magnesium alloy material and production process thereof

The present invention provides a magnesium alloy material excellent in high mechanical characteristics without using special manufacturing facilities or processes and a method for manufacturing the magnesium alloy material. The magnesium alloy material is an Mg&#x2014;Zn&#x2014;RE alloy containing Zn as an essential component, at least one of Gd, Tb, and Tm as RE, and the rest including Mg and unavoidable impurities and contains a needle-like precipitate or a board-like precipitate (lengthy precipitate: X-phase=&#x3b2;-phase, &#x3b2;'-phase, and &#x3b2;1-phase).

Magnesium alloy material and method for manufacturing same

Disclosed is a non-heat treated steel for hot forging, particularly suitable for producing connecting rods of automobile engines. The steel consists essentially of: by weight, C: 0.3-0.8%, Si: 0.1-2.0%, Mn: 0.3-1.5%, P: 0.01-0.15%, Cr: 0-1.0%, V: 0-0.4%, Al: 0-0.05%, N: 0.005-0.03% and the balance being Fe and inevitable impurities, provided that the contents of C, Mn and Cr fulfill the following condition: 1.40[C %]+0.28[Mn %]+0.50[Cr %]&#x2267;0.75 Pearlite area fraction in this steel after hot forging is 50% or more. Notches are provided with laser beam on an intermediate part at the location from which fracture starts, and load is applied. Then, the intermediate is split to be two components (big end or cap and small end/rod for connecting rod). The components are adhered to form the parts.

Non-heat treated steel for hot forging with easy fracture splitting

A connecting rod of an internal combustion engine, comprising a connecting beam section serving as a main body of the connecting rod. Big and small ends are located at the opposite ends of the connecting beam section. A first joining section is located between the connecting beam section and the big end to connect the connecting beam section and the big end. A second joining section is located between the connecting beam section and the small end to connect the connecting beam section and the small end. In this connecting rod, each of the first and second joining sections gradually and continuously decreases in cross sectional area toward the connecting beam section and has a strength distribution in which a strength increases with a decrease in the cross sectional area.

High-strength connecting rod and method of producing same

A wear resistant sintered member exhibits superior wear resistance at the same level as those of the conventional materials without using a Co-based hard phase is provided. A first hard phase comprising Mo silicide particles dispersed in an Fe-based alloy matrix of the first hard phase and a second hard phase comprising a ferrite phase or a mixed phase of ferrite and austenite having a higher Cr concentration than the Fe-based alloy matrix surrounding a core consisting of Cr carbide particles, are diffused in an Fe-based alloy matrix, the Mo silicide particles are contained in the first hard phase in an amount of 3 to 25 % by area, and the Cr carbide particles are contained in the second hard phase in an amount of 3 to 30 % by area.

Wear resistant sintered member

A steel for gears consists essentially of 0.10-0.30 wt % of C, not more than 1.0 wt % of Si, not more than 1.0 wt % of Mn, 1.50-5.0 wt % of Cr, and balance including iron and impurity. A gear made by the steel forms a hardened surface layer by carbonizing-hardening-tempering or carbonitriding-hardening-tempering. The amount of C at the hardened surface layer is within a range 0.7 to 1.3 wt %, and the amounts of C, Si and Cr satisfies a relationship 5.5&lt;3.times.C (wt %)+5.2.times.Si (wt %)+Cr (wt %). Therefore, the gear performs superior pitting-resistance and wear-resistance.

Steel for gear, gear superior in strength of tooth surface and method

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Yokohama, Japan

Yoshio Okada