球状黒鉛鋳鉄の表面と内部の凝固時間比による溶湯ひけ傾向評価 Evaluation of Molten Spheroidal Graphite Cast Iron Shrinkage Tendency by Solidification Time Ratio Between Casting Surface and Inside

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  In order to evaluate a shrinkage tendency of molten spheroidal graphite cast iron, test pieces having a variety of widths with a constant thickness were cast and the shrinkage areas were measured. Also, cooling curves of the surface and the inside of test pieces were prepared to find a relationship between the shrinkage area and the inside solidification ratio when the surface solidified (temporarily referred as <i>S/I</i>). The <i>S/I</i> value at the start of shrinkage occurrence is determined as a critical <i>S/I</i> to shrinkage, with which the shrinkage tendency for the molten iron has been evaluated. The critical <i>S/I</i> to shrinkage are determined for different contents of C, Mo, Sb, Cr and P and inoculation methods and Bi addition. Resultantly the higher amount of C makes the shrinkage lower and minimum at the C content approx. 3.7 %, and it becomes higher with the increase of the amount of alloy element and Bi addition and lower by inoculation. Also, it is found that the shrinkage tendency by adding an alloy element can be converted to C content. Other causes of shrinkage e.g. the lack of graphitization, worse fluidity due to primary graphite, or the difference of solidification time between the surface and the inside are also explained.

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 71(2), 104-110, 1999-02

    公益社団法人 日本鋳造工学会

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各種コード

  • NII論文ID(NAID)
    10002554804
  • 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
    4658666
  • 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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