FE-C SERIES OR FE-SI-C SERIES ALLOY CAPABLE OF MAKING THE SAME AMORPHOUS, ALLOY POWDER UTILIZING THIS ALLOY AND POWDER METALLURGICAL MEMBER UTILIZING THIS ALLOY POWDER

Japanese Patent JP3695935

B2

PROBLEM TO BE SOLVED: To make an alloy possible to be amorphous and to obtain a metallurgical member in which fine graphite is formed in a metallic structure by annealing by adding a specified amt. of B to an Fe-C series alloy or an Fe-Si-C series alloy, executing melting and thereafter rapidly cooling it.
SOLUTION: The compsn. of an Fe series alloy is composed of, by weight, 2.0 to 7.0% C, 0.2 to 3.0% B and the balance Fe with inevitable impurities. Or, it is composed of 2.0 to 7.0% C, 0.2 to 3.0% B, 1.0 to 2.5% Si and the balance Fe with inevitable impurities. The either of them is a high carbon-contg. iron series alloy compsn. contg. an eutectic compsn. and in the case that rapid cooling is executed from a melted state at a rate capable of making it amorphous, by the addition of B, in the case of a hypo-eutectic compsn. in which the content of C is smaller than the case of the eutectic compsn., the precipitation of primary crystal austenite is checked. In the case of a hyper-eutectic compsn. in which the content of C is large, the precipitation of graphite is checked, it is solidified as it is and the whole body or a part thereof of the surface layer is made amorphous to exhibit high strength.

Akihisa Inoue
Zhang
Noboru Sato
Shintoshi Wang
Yuji Ogata
Kazuya Sato

JP7342098A

September 14, 2005

March 06, 1998

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Akihisa Inoue
Japan Material Co., Ltd.

B22F1/00; C22C38/00; C22C45/02; (IPC1-7): C22C45/02; B22F1/00

JP8209263A
JP9256123A
JP55152150A
JP53102208A
JP63119209A
JP4013046U

Yoshiaki Mori

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