W-Cr-V 熱間ダイス鋼中の炭化物について : 実用特殊鋼中の炭化物の電解分離による研究 VI

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In the present study, the carbides isolated electrolytically from two kinds of W-Cr-V hot-work die steels were examined by X-ray and chemical analyses, and by electron-microscopic observations. The carbides in the annealed steels are M_6C+M_<23>C_6(+MC), and by austenitizing treatment, M_<23>C_6, the so-called heat-treatable carbide, preferentially dissolves into the matrix, leaving a part of M_6C (+MC) as undissoloved carbides. In tempering of these steels, a transitional carbideW_2C appears, as reported by K. Kuo (J.I.S.I. vol. 174, 1953, p. 223), and the carbide phase changes in the 4th stage of tempering are as follows ; 0→W_2C(+MC)→M_6C(+MC)→M_6C+M_<23>C_6(+MC) W concentration in the precipitated carbides increases with the rise of tempering temperature, but V and Cr concentrations in the carbides take the maximum values in the course of tempering. This fact is considered to be due to the increase of the amount of W-rich carbide M_6C, resulting in the dilution of V-rich carbide MC and Cr-rich carbide M_23C_6.
社団法人日本鉄鋼協会の論文
1958-12-01