実用特殊鋼の炭化物の電解分離による研究 (V) : 二, 三の冷間ダイス鋼の炭化物について

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The nature of the carbides in several cold-working die steels were studied by the electrolytic isolation, subsequent chemical analysis and X-ray examination, and the following results were obtained : (1) The carbides in annealed high-C high-Cr die steel are M_7C_3, as reported in the previous paper. (Tetsu-to-Hagane, Vol.42 (1956) p.1118) While, the carbides in the steels, modified by the addition of W (3%) or Mo (1%), are principally M_<23>C_6. The high-C high-W die steel contains very large amounts of M_<23>C_6, accompanied some M_6C. (2) The most of Cr, W and Mo in the annealed steels are tied up in the carbides. After usual quenching treatment of these steels, the considerable carbides are undissolved in austenite, so that at such a quenching temperature, C, Cr, W and Mo contents of the austenite are less than those of the steel as a whole. (3) In the course of tempering of these steels, ε and θ carbides precipitated in martensite change to another special carbides, depending on the time and temperature of tempering. That is, in the high-C high-Cr-W steel, carbide reactions proceed as ε⇾θ⇾M_7C_3⇾M_<23>C_6, and in the high-C high-W steel, as ε⇾θ⇾M_6C⇾M_<23>C_6.
社団法人日本鉄鋼協会の論文
1958-05-01