Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Sanyo Special Steel Co., Ltd.

Makoto Asami

Toshiyuki Sawada

Noriyuki Yamada

Takeshi Sugawara

Akihiko Yanagitani

Shingo Fukumoto

Tomoki Okita

Yoshitaka Tsujii

Shogo Matsuki

Nobuki Matsuo

Takashi Tsuyumu

Toshiyuki Sanyo Special Steel Co Ltd Sawada

There are disclosed a laser clad valve seat raw-material powder superior in productivity, cladding property, wear resistance and finishing property, and a laser clad valve seat using the same superior in wear resistance. The row-material powder comprises a powder mixture comprising: 80 to 99% by weight of a Cu-based alloy powder comprising 0.5 to 5% by weight of B, 0 to 20% by weight of Ni, 0 to 10% by weight of Fe plus Co, 0 to 5% by weight of Si, 0 to 3% by weight of Al, and the balance Cu and unavoidable impurities; and 1-20% by weight of an Fe or Co based alloy powder having a Vickers hardness of 500 HV or higher and an average particle diameter of 50 to 200 &#x3bc;m of and comprising 5 to 40% by weight of Mo, 0 to 25% by weight of Cr, 0 to 5% by weight of Si, and the balance Fe or Co and unavoidable impurities.

Raw material powder for laser clad valve seat and valve seat using the same

An iron-based alloy comprises 1.5 to 2.5 wt % of C, 0.25 to 4.75 wt % of Ni, and W and V in quantities surrounded by the line L as shown in FIG.of the attached drawings with a balance of Fe and inevitable impurities. The iron-based alloy is obtained by a first heat treatment for applying a solid solution treatment by rapidly cooling the iron-based alloy from a temperature of an austenite forming temperature or more to consequently obtain a mixed matrix comprising a base matrix of martensite and remaining austenite phases and a non-molten carbide, and a second heat treatment for cooling the iron-based alloy after precipitating an MC type carbide within an eutectoid transformation temperature range to consequently precipitate a low carbon content austenite phase.

Iron-based alloy and method for production thereof

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Wako, Japan

Makoto Asami