高速度鋼の炭化物におよぼす焼戻時間および繰返焼戻の影響 : 電解分離による高速度鋼の炭化物に関する研究 IV

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This report deals with a study on the effects of tempering time and repeated tempering at 575℃ for carbides in low-W high speed steels. The carbides were isolated electrolytically from specimens of several heat-treated high speed steels. Chemical composition and crystalline structure of the isolated carbides were determined by chemical analysis and X-ray diffraction, and the shape of the cabides were observed by electron microscopy. The results were obtaind as follows : (1) The amount of precipitated carbides was increased gradually with progress of tempering time, but the amount of precipitated carbides during tempering at 575℃×100h were less than at 650℃×1h. The carbides in the steel on a short-time tempering were composed of M_6C and MC types, while M_<23>C_6 carbide appeared in the steel of tempering at more than 50 hours. (2) On the repeated tempering at 575℃, the amount of carbides was increased, especially on twice-repeated tempering suddenly. The carbides in the steel on repeated tempering at 575℃ were precipitated as much as those in the steel on continuous tempering of 10-50 hours at the same temperature. Presumably it should promote the precipitation of carbides during repeated tempering.
社団法人日本鉄鋼協会の論文
1960-11-01