オースフォームをほどこしたMn-Cr-Bばね鋼の疲労強度について

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書誌事項

タイトル別名
  • On the Fatigue Strength of Ausformed Mn-Cr-R Spring Steel
  • オースフォーム オ ホドコシタ Mn-Cr-Bバネ コウ ノ ヒロウ キョウド ニ ツイテ カコウ オンド , カコウド ノ エイキョウ
  • The Effects of Deformation Temperature and the Rate of Deformation
  • 加工温度, 加工度の影響

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説明

When Mn-Cr-B spring steel is ausformed in the stable austenite phase the deformation of the material will concern its fatigue properties. It is the aim of the present study to clarify what are the effects that the deformation will have with its temperature and at its rate on the fatigue properties of the material. The steel specimens were ausformed at 800°, 850° and 900°C up to nearly 50% reductions in thickness and tempered at 480°C for 1 hour. Then, their fatigue properties have been investigated under completely reversed plane bending stresses and compared with those of the specimens treated conventionally and processed by the thermomechanical treatment of cooling it continuously. The results obtained within this scope of experiment are summarized as follows.<br>(1) The average endurance limit of the ausformed specimens within the range of 22-40% reductions shows an increase of nearly 29% over that of the specimen treated conventionally.<br>(2) The fatigue lives of the ausformed specimens too are remarkably prolonged as compared with the conventionally treated specimens.<br>(3) The fatigue properties at the higher rate of deformation are unreliable because of the slight improvement of the fatigue limit and the great variation of the data.<br>(4) There is not much difference between the fatigue strengths of the ausformed specimens and those specimens produced by the thermomechanical treatment of cooling continuously at the equal rate of deformation, but the hardness levels of the former are by Rc 1-2 numbers lower than those of the latter.<br>(5) The authors recommend the range of 850°-900°C as the appropriate deformation temperature and reductions in thickness up to 40% for this spring steel.

収録刊行物

  • 材料

    材料 20 (217), 1101-1106, 1971

    公益社団法人 日本材料学会

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