鑄鐵の熱傳導率に就て(第 1 報)

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概要

• 論文の詳細を見る

• In the hot rolling practice of sheet iron, there are sometimes occurred the breaking the chilled roll, which is generally perceived to be caused by the thermal stress induced in the roll due to the radial temperature gradient occurred during heating and cooling the roll. The measurement of the thermal stress or the temperature gradient is almost impossible in the practical scale, so that, in general case, it is estimated by the calculation. To calculate the temperature distribution of the roll during heating and cooling, it is very important to have a corrected knowledge on the thermal conductivity of materials constituted the roll such as the out-side chilled part and the inner pearlitic one. In addition to this, it is also important to give some knowledges of the thermal conductivity to the problems on the cooling of the ingot case after teeming melt and on the cooling of the cylinder and its head of the internal combustion engine. There are a few reports on the thermal conductivity of cast iron, but the observation is almost done at the ordinary temperature and the kind of cast iron is limitted to a narrow range. The authour measured the thermal conductivity on the following kinds of cast iron to extend over the temperature range of the ordinary temperature to about 800℃ by a special apparatus in which heats propagated by the convection and the radiation from the heating source are almost illiminated. 1. Two kinds of gray cast iron. 2. Chilled part, i. e., white iron part and pearlitic structure part of the chilled roll. 3. White iron and pearlitic iron part of the sand roll. 4. Pearlitic part of the high carbon chilled roll. 5. White iron to be produced malleable cast iron, pearlitic iron with graphitic carbon specks and ferritic iron with graphitic carbon specks, i. e., malleable cast iron. 6. Iron castings of the martensitic structure. From the results of the experiment, it is known that the thermal conductivity of cast irom is much more affected by the microstructure of the matrix than by the chemical composition.

• 社団法人日本鉄鋼協会の論文
• 1933-01-25

著者

• 菊田 多利男

  日立製作所中央研究所

• 菊田 多利男

  戸畑鑄物會社

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