低炭素鋼の焼入に関する二三の実験

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タイトル別名
  • On Some Experiments of Quenching of Low-Carbon Steel
  • テイタンソ コウ ノ ヤキイレ ニ カンスル ニサン ノ ジッケン

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抄録

Low-carbon steel of the composition of C 0.13∼0.2%, Mn 0.7∼2%, is used for large-size chains. It is sometimes quenched and tempered, after welding, for the purpose of increasing its strength. Because of the low content of C, this sort of steels in such a structure, is not completely martensitized. Its mechanical property is influenced to a large extent in the cooling state, according to the quenching method. At the same time it is affected by the mode of heat treatment, that is pre-treatment, heating temperature and heating time in the quenching. These are very important affairs in the practical production. Nevertheless these seem to be neglected and the studies on the quenching of this sort of structure are very rare. This experiment first intend to describe the state how the mechanical properties of this sort of steel are changed by heat treatment.This is considered in relation to the growth of γ grains in the austenite region. Then follows an inspection of the tendency of the ferrite precipitation in the cooling process from the various heating conditions being expressed as the functions of temperature and time. We come to the conclusion that, the rate of ferrite precipitation at the subcritical temperature and its hardness after quenching is closely related with the state of Al, N and AlN which are dissolved or precipitated in the γ region.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 23 (3), 137-141, 1959

    公益社団法人 日本金属学会

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