共析炭素鋼の低温熱浴焼入および常温時効による長さの変化

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  • On the Length Changes in Hot-Bath Quenching at Low Temperatures and Aging at Room Temperature of Eutectoid Carbon Steel (Hot-Bath Quenching at Low Temperatures of Eutectoid Carbon Steel, 3rd Report)
  • キョウセキ タンソ コウ ノ テイオン ネツヨク ヤキイレ オヨビ ジョウオン ジコウ ニ ヨル ナガサ ノ ヘンカ

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The length changes in hot-bath quenching both above and below the Ms temperature and aging at room temperature as well as in tempering of a 0.8%C steel were measured. The experiment has revealed the following: The expansion in hot-bath quenching at the martensitic range, of 200°C-1 hr or 180°C-5 hr, in which a mixed structure of lower-bainite and tempered martensite containing a lot of retained austenite is formed, is much smaller than that in ordinary quenching or martempering, and then, during the subsequent aging at room temperature a comparatively large expansion occurs with time in these hot-bath quenched specimens as a part of the retained austenite decomposes into martensite. The retained austenite is more stabilized in consequence of the proceeding of the lower-bainite reaction, but does not decompose at room temperature, causing little change in length.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 24 (12), 782-785, 1960

    公益社団法人 日本金属学会

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