アームコ鉄のSnoek Damping Peakに対する熱処理の影響

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  • Effect of Heat Treatments on Snoek Damping Peak in Armco Iron
  • アームコテツ ノ Snoek Damping Peak ニ タイスル ネツ ショリ ノ エイキョウ

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The Snoek damping peak in iron has been studied in Armco iron with variation in microstructure, using a torsion pendulum at about 3 cps. Fully developed α-veining and grain boundary ridges are observed in a specimen cooled in furnace from γ-range. A Snoek damping peak in such a specimen quenched from temperatures below 650°C is only the normal nitrogen peak. On the other hand, that in a specimen freed from α-veining by quenching from 720°C becomes broadened with the internal friction considerably higher on the higher temperature side of the normal nitrogen peak. This broadened peak can be described as the sum of the normal carbon and nitrogen peaks. The height of the nitrogen peak does not vary appreciably with increasing quenching temperature up to 650°C. From this nitrogen peak, we estimate that the nitrogen content in the alpha solid solution was about equal to that in Armco iron. From these results, it is evident that carbon concentrates along the sub-boundaries and grain boundaries. Therefore, it seems likely that carbon is responsible for the α-veining and grain boundary ridging effects visible under the microscope. The Snoek damping peak in a specimen freed from the α-veining and grain boundary ridges by recrystallization in α-range is broadened. This broadened peak also can be described as the sum of the normal carbon and nitrogen peaks. The height of the component carbon peak increases with increasing quenching temperature, but that of the component nitrogen peak does not vary appreciably.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 23 (9), 526-530, 1959

    公益社団法人 日本金属学会

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