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Synopsis: 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 M6C+M23C6(+MC), and by austenitizing treatment, M23C6, the so-called heat-treatable carbide, preferentially dissolves into the matrix, leaving a part of M6C(+MC) as undissoloved carbides. In tempering of these steels, a transitional carbide W2C 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; θ→W2C(+MC)→M6C(+MC)→M6C+M23C6(+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 M6C, resulting in the dilution of V-rich carbide MC and Cr-rich carbide M23C6.

ON CARBIDES IN W-Cr-V HOT-WORK DIE STEELS