析出硬化型ステンレス鋼の脆性破壊 Brittle Fracture of Precipitation Hardening Stainless Steel

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Fracture of a hook of a launching strop used for lifting a launch on a patrol vessel is investigated in detail. The hook was made of a precipitation hardening stainless steel (JIS SUS630) . No apparent deformation was observed in the hook and the fracture surface exhibited features of brittle fracture, such as chevron patterns in macroscopic observations and quasi-cleavage fracture in scanning electron microscopy. Hardness measurement revealed that the material was harder than expected from the prescribed heat treatment conditions. Charpy impact energy was less than one-half of the value in the literature. Elemental distribution maps obtained by electron-probe microanalysis showed segregations of the major additives including chromium, nickel and copper. The distribution patterns suggest that the segregations were formed during the die forging. These segregations may have formed low-toughness phases in the matrix. It is concluded that non-uniform microstructure with substantial segregation is responsible for the brittleness, or low toughness, probably caused by inadequate forging conditions such as low temperature and high pressing speed.

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  • 日本舶用機関学会誌  

    日本舶用機関学会誌 33(10), 764-771, 1998-10-01 

    The Japan Institute of Marine Engineering

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各種コード

  • NII論文ID(NAID)
    10002246874
  • NII書誌ID(NCID)
    AN00196373
  • 本文言語コード
    JPN
  • 資料種別
    OTR
  • ISSN
    03883051
  • NDL 記事登録ID
    4620199
  • NDL 雑誌分類
    ZN24(科学技術--運輸工学--船舶)
  • NDL 請求記号
    Z16-747
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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