実用特殊鋼の炭化物の電解分離による研究 (IV) : 低 W-Cr 切削用工具鋼の炭化物について

概要

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Carbides electrolytically isolated from low W-Cr cutting-tool steels were studied by X-ray and chemical analysis, and the following results were obtained. (1) The principal carbide in annealed structure of low W-Cr tool steels was M_<23>C_6 (κ-carbide). Cementite containing W and Cr (θ-carbide) also appeared in the low-W grade steels. (2) By tempering of these steels, hexagonal ε-carbide precipitated in the first stage, and θ-carbide in the third stage of tempering, and at last κ-carbide appeared by the tempering above 650℃. (3) In the fourth stage of tempering, an enrichment of Cr and W into carbides occurred and was increasingly marked with the rise in tempering temperature. The rate of enrichment of W into carbides was exceedingly slow compared with that of Cr. (4) In an chromium-free W steel, κ-carbide was decomposed by annealing, and by heating to quenching temperature, accompanied by the formation of WC and η-carbide. This tendency was reduced by the alloying of Cr, V and Mo, and was promoted by Ni, Co and Si.
社団法人日本鉄鋼協会の論文
1958-02-01