実用特殊鋼の炭化物の電解分離による研究 (III) : 二, 三の強靱鋼の炭化物について

概要

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Electrolytic isolation studies were carried out on carbides in Ni-Cr, Cr-Mo and Si-Mn constructional steels, and the following results were obtained, (1) In as annealed condition, the Cr, Mn and Mo concentrate in the carbides, while the most portions of the Si and Ni dissolve in the ferrite. The carbides in these annealed steels show irregular plate-like or dendritic shapes. (2) The carbides in tempered structure of these steels have stringy or globular shapes. The mean ferrite path from a carbide to the closest carbide particle is estimated as about 1.5 times of the mean carbide diameter. (3) Concentrations of special elements in carbides in these steels, tempered at about 400℃, are similar to the contents of each element in the steels. At above 500℃, the carbides are enriched in Cr, Mn and Mo, while impoverished in Si and Ni. The rate of enrichment of Mo in carbides are exceedingly slow, as compared with those of Cr and Mn. The rate of enrichment of Cr and Mn in carbides are retarded by the co-existence of Mo in the steel.
社団法人日本鉄鋼協会の論文
1957-04-01