日本金属学会誌

J. Japan Inst. Metals, Vol. 40, No. 6 (1976),
pp. 593-601

Effect of Magnetism on the Partition of Alloying Elements between Cementite and Ferrite

Musong Ko1, Taketo Sakuma2 and Taiji Nishizawa2

1Graduate School, Tohoku University, Sendai
2Department of Materials Science, Faculty of Engineering, Tohoku University, Sendai

Abstract:

It has been pointed out by Hillert et al. in 1967 that the partition of manganese between cementite and ferrite is markedly influenced by the magnetism of ferrite, and the temperature dependence of the partition coefficient shows an abnormal deviation from the ordinary Arrehnius equation in the vicinity of the Curie temperature. This work was intended to extend their idea to the other elements, and the partition coefficient of chromium, manganese, cobalt and nickel between cementite and ferrite at 700∼500°C was measured. It was found that the partition coefficient of chromium and manganese increases considerably, and that of cobalt decreases abnormally as the equilibration temperature falls. In the case of nickel, the coefficient does scarcely show the sign of decrease contrary to the prediction from the Arrehnius equation. These findings are in good agreement with the theory proposed by Hillert et al. The partition of the elements between cementite and austenite was also studied, and a parameter Δ GMα/γ Fe representing the effect on the relative stability of ferrite and austenite was evaluated.


(Received 1975/10/17)

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