オーステンパ球状黒鉛鋳鉄の水による脆化と抑制方法 Embrittlement in Austempered Spheroidal Graphite Cast Iron Caused by Water and Its Controlling Method

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  It is revealed that both the ultimate tensile strength and elongation are decreased remarkably by wetting austempered spheroidal graphite cast iron (ADI) with water at room temperature. The embrittlement behavior of ADI is investigated in detail and then the controlling methods of the embrittlement are proposed. Under the condition of wetting with water compared with the values under the dry condition (in the air), the ultimate tensile strength of ADI is decreased in the range from 65 to 80 % and also the elongation is decreased to about 10%. The white brittle fracture surface which is the starting point of failure is observed near the outer surface of the specimen. This is in contrast with the dimple pattern is usually formed in ADI tested in the air. The embrittlement behavior of ADI is depressed by the formation of ferrite layer on iron surface, because ferrite is not embrittled by water. The coating with paint for the purpose of avoiding direct contact with water is also efficient in depressing the embrittlement behavior. This is suggested that the drastic reduction of strength and ductility for ADI may be caused by hydrogen embrittlement.

収録刊行物

  • 鋳造工学 = Journal of Japan Foundry Engineering Society  

    鋳造工学 = Journal of Japan Foundry Engineering Society 70(2), 115-120, 1998-02 

    Japan Foundry Engineering Society

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各種コード

  • NII論文ID(NAID)
    10002553397
  • NII書誌ID(NCID)
    AN10514770
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13420429
  • NDL 記事登録ID
    4403061
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-277
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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