日本金属学会誌

J. Japan Inst. Metals, Vol. 21, No. 11 (1957),
pp. 662-665

Study on Carbides in Iron and Steel by Electrolytic Isolation (8th Report). Carbides in Tungsten Steel

Tomo-o Sato, Taiji Nishizawa and Masaki Ôhashi


Abstract:

Carbides electrolytically isolated from tungsten steels were studied by means of X-ray, thermomagnetic and chemical analysis, in order to elucidate the nature and occurrence of carbides, especially M23C6(κ-carbide), with respect to the chemical composition and heat-treatment of steel. The experimental data on the composition range of M23C6 show good agreement with those recently reported by K. Kuo. The Curie point of M23C6 varies from 150 to 400°, depending on its chemical composition and its thermal history. The contracted η-carbide (η*), observed by H. J. Goldschmidt in decarburizing of M6C, appeared in several low C- high W steels. The chemical formula of η* is considered to be M12C, which is formed by liberation of carbon from M6C.


(Received 1957/7/15)

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