低 W 高速度鋼および低 W-Co 高速度鋼における熱処理と炭化物の挙動について : 電解分離による高速度鋼の炭化物に関する研究 1

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The report deals with a study on the behavior of carbides in low-W high-speed steel and low W-Co high speed steel. The total amounts of carbides in the several heat-treated specimens of the high speed steels were determined by electrolytic isolation method. Chemical compositions and crystalline structures of the isolated carbides were determined by chemical analysis and X-ray diffraction, and the shapes of the carbides were observed by electron microscope, and the following results were obtained. (1) In annealed states, the amounts of carbides in these steels are about 20∿22% wt%, and about 85∿95% of the W and V in the steels are concentrated in the carbides, while the most portions of the Si, Mn and Co are dissolved in the matrix. The carbides precipitated in these annealed steels are M_6C, MC and M_<23>C_6. (2) In quenched states, the insoluble carbides in the high speed steels are only M_6C, and it amounts to about 10 wt%, which is the same about 40% of the carbides in annealed state. (3) The more rises the tempering temperature, the more precipitate the carbides from the austenite. And, especially, the concentration percentage of the special alloy elements in the carbides increases suddenly at the tempering of 575℃, and MC carbide appeares in the steel by tempering at above 300℃.
社団法人日本鉄鋼協会の論文
1958-10-01