オーステンパ球状黒鉛鋳鉄の靱性に及ぼす焼戻し処理の影響

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タイトル別名
  • Effect of Tempering Treatment on Toughness of Austempered Ductile Iron
  • オーステンパ球状黒鉛鋳鉄の靭性に及ぼす焼戻し処理の影響
  • オーステンパ キュウジョウ コクエン チュウテツ ノ ジンセイ ニ オヨボス

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説明

  Toughness of austempered ductile iron (ADI) tempered at 673, 723 and 773 K for various time periods are examined. The toughness increases gradually with increasing tempering time at 673 K while that decreases drastically even in short time tempering at 773 K. The toughness shows a peak value, and then decreases by tempering at 723 K. The highest toughness value is obtained by tempering at 723 K for 10 min in this study. The tempering process of ADI is found to be composed of two stages by SEM, TEM and X-ray analyses. In the first stage, the toughness increase is attributed to the increase in the ductility caused by the decrease in dislocation density mainly in the ferrite phase that has been introduced during the austempering process. The decrease in toughness occurs with the precipitation of carbides corresponding to the decomposition of retained austenite in the second stage. The carbides are identified to be Fe3C by TEM.

収録刊行物

  • 鋳物

    鋳物 66 (7), 483-488, 1994

    公益社団法人 日本鋳造工学会

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