日本金属学会誌

J. Japan Inst. Metals, Vol. 2, No. 1 (1938),
pp. 26-28

The Equilibrium Diagram of the Cobalt-Carbon System

Uichi Haschimoto1, Naridi Kawai2

1東京高等工藝學校
2芝浦製作所研究所

Abstract:

The effect of carbon on the allotropic transformation of cobalt is thoroughly investigated by means of microscopie, dilatometric and magnetic analyses, and a revised. equilibrium diagram is proposed. The allotropic transformation point of cobalt lowers at first with the increase of carbon and reaches the lowest temperature at about 0.1% C. With a further increasing content of carbon the transformation point rises, and by the peritectoid reaction at 502° and 0.27 per cent carbon α-phase decomposes to β-phase and graphite. According to the cooling curves, the transformation point lowers with the addition of carbon and at 0.25% C and 341° a eutectoid reaction occurs.


(Received 1937/08/25)

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