亜共析鋼の恒温オーステナイト化曲線

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タイトル別名
  • Time-Temperature Austenization Diagram of Hypo-eutectoid Steel
  • アキョウセキ コウ ノ コウオン オーステナイトカ キョクセン

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抄録

An austenitizing diagram representing the austenitizing process in the high frequency-or flame-hardening of carbon steels was obtained. This diagram is provisionally called T-T-A Diagram (Time Temperature-Austenitization Diagram) by the authors. The specimen steels (with C-contents: 0.20, 0.40 and 0.69%) were preliminarily heat-treated to give them various structures: fine pearlite, coarse pearlite and spheroidized cementite. In the experiments, the specimens were heated in a lead bath followed by rapid quenching in the water. Then the T-T-A Diagram was obtained from the change in hardness (Hv). The results were as follows: (1) Under the same pre-heat-treatment with different C-contents, austenitization starts at the same time, but finishes differently that is, the later with the less C-content. (2) Under different pre-heat-treatments with the same C-content, the specimen with a spheroidized cementite structure starts and finishes earliest, followed by one with a fine pearlite and one with a coarse pearlite in that order. (3) In rapid heating and quenching, if the specimen is heated up to the specified temperature, a very short holding time is sufficient for hardening. The spheroidized cementite structure is found effective.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 25 (8), 515-519, 1961

    公益社団法人 日本金属学会

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