可鍛鋳鉄の内部摩擦とヤング率

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タイトル別名
  • Internal Friction and Young’s Modulus in Malleable Cast Iron
  • カタンチュウテツ ノ ナイブ マサツ ト ヤングリツ
  • Internal Friction and Young’s Modulus in Malleable Cast Iron

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Changes in internal friction and Young’s modulus with the graphitization of malleable cast iron were investigated. The effects of strain-amplitude, the structures of the matrix, the content of graphite, the size and the shape of the graphite nodules were described and discussed. In the as-cast state internal friction was quite low and no amplitude dependence was observed for strains of less than 10−5, while the Young’s modulus was comparatively high. As the specimens, however, were heated to graphitize, internal friction became higher and reached a final value at the end of the graphitization. On the contrary the Young’s modulus decreased by a considerable amount with the graphitization. In the graphitized state the internal friction showed a well-defined amplitude dependence, that is, it increases linearly with the strain-amplitude. By this observation, the cause of internal friction in annealed malleable cast iron is considered to be caused by the magneto-mechanical static hysteresis in ferrite. The notch effect of graphite nodules may cause a local stress concentration and bring about an increase in static hysteresis.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 25 (7), 448-452, 1961

    公益社団法人 日本金属学会

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