黒鉛形状の異なるオーステンパ処理鋳鉄のころがり疲労 Rolling Contact Fatigue of Austempered Cast Irons with Different Graphite Shapes

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  The effects of graphite shapes and matrix structure on the rolling contact fatigue strength of cast iron were investigated using a Nishihara-type wear test machine with gear oil lubricant. Two kinds of spheroidal graphite cast irons with different graphite diameters, compacted vermicular (CV) cast iron and the flake graphite cast iron were austempered at 648K, 573K and 513K for 7.2 ks. They were also quenched from 1123K and tempered at 825K and 552K for 7.2 ks. The rolling contact fatigue limit (<i><b>F</b></i><sup>∗</sup>) of austempered irons are much higher than those of quenched and tempered irons with the similar graphite morphology and matrix hardness. The morphology of graphite has also large on <i><b>F</b></i><sup>∗</sup>, and <i><b>F</b></i><sup>∗</sup> tends to increase in the order of flake, CV and spheroidal graphite cast iron under the same heat treatment condition. Two types of fatigue cracks were observed : one generated from the contact surface and the other from inside of the specimen. The latter type appeared only in the CV cast iron and the flake graphite cast iron austempered at 648K. The mode of cracking should depend on both the strength and toughness of matrix and the morphology of graphite.

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  • 鋳造工学 = Journal of Japan Foundry Engineering Society  

    鋳造工学 = Journal of Japan Foundry Engineering Society 70(6), 381-387, 1998-06 

    Japan Foundry Engineering Society

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各種コード

  • NII論文ID(NAID)
    10002553855
  • 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
    4502303
  • 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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