比熱測定による炭素鋼の焼戻機構の研究

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タイトル別名
  • Study of Tempering of Quenched Carbon Steel by Specific Heat Measurement
  • ヒネツ ソクテイ ニ ヨル タンソ コウ ノ ヤキモドシ キコウ ノ ケンキュウ

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抄録

The specific heat changes of quenched carbon steels (0.51∼1.39%C) were continuously measured in a temperature range from −100° to 600°C, using the Nagasaki-Takagi type of adiabatic calorimeter. The effect of aging was also studied. Heat evolutions due to the transformations of quenched carbon steel by tempering were observed below 500°C. A heat evolution was found to take place even at −100°C. Analysis of the specific heat-temperature diagrams shows that there are five stages of transformation in tempering of quenched carbon steel. The preliminary heat evolution begins below −100°C and finishes at about 100°C. The decomposition of martensite occurs at 100°∼160°C, and the decomposition of low carbon martensite takes place in a wide temperature range from 160° to 500°C. The retained austenite decomposes at 200°∼300°C, while the ε-carbide decomposes at 300°∼400°C. No χ-carbide seems to be precipitated in tempering of quenched carbon steel.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 26 (8), 494-498, 1962

    公益社団法人 日本金属学会

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