過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-Austenitization Diagram of Hyper-Eutectoid Steel
  • カキョウセキ 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

With the purpose to provide an adequate guide to rapid heating and quenching of carbon steels, time-temperature-austenitization diagrams (T-T-A diagram) were plotted for hyper-eutectoid steels (0.92, 1.28%C). Specimens of uniform size and the same test procedure were adopted as in the previous investigation on hypo-eutectoid steels. The results follow: (i) Starting and finishing of austenitization took nearly equal, short time for fine pearlite (F.P.) and for spheroidized cementite (S.C.) and long time for coarse pearlite (C.P.). In the 0.92%C steel, however, which had higher degree of spheroidization of S.C. than other steels finishing of austenitization took long time only in the S.C. (ii) Comparing T-T-A diagrams including hypo-eutectoid steels (0.20, 0.40, 0.69%C), it was found that starting of austenitization was approximately the same for all steels regardless of the difference in carbon content; finishing of it was delayed with an increase in carbon content down to the level of eutectoid steel, becoming constant thereafter. (iii) Being rapid in progress, the austenitization reaction has to be maintained for only a short duration after the prescribed temperature is attained for the purpose of rapid heating and quenching, and thereby the S.C. structure proves effective.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 26 (8), 518-522, 1962

    公益社団法人 日本金属学会

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