Ｗ‐Ｍｏ系高速度工具鋼の高温疲労特性

DOI Web Site Web Site 参考文献9件
  • 寺沢 正志
    金沢大学大学院自然科学研究科機能機械科学専攻
  • 沙魚川 智之
    金沢大学大学院自然科学研究科機能機械科学専攻
  • 三谷 状士
    （株）不二越機械工具事業部
  • 渡邊 千尋
    金沢大学大学院自然科学研究科システム創成科学専攻
  • 門前 亮一
    金沢大学大学院自然科学研究科システム創成科学専攻

書誌事項

タイトル別名
  • High-temperature Fatigue Property of a W-Mo Type High-speed Steel
  • W-Mo系高速度工具鋼の高温疲労特性
  • W Moケイ コウソクド コウグ コウ ノ コウオン ヒロウ トクセイ

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抄録

Fatigue tests of W–Mo type high-speed steel specimens were carried out at 20 and 600°C under various stress amplitudes σ. Fatigue lives of the specimens tested at 20 and 600°C under each amplitude between 1100 and 1400 MPa were identical, but under each amplitude between 700 and 1000 MPa, those of the specimens tested at 600°C were shorter than those at 20°C. Fracture origins of the specimens fatigued at 20°C under all stress amplitudes and at 600°C under σ≧1100 MPa were large aggregates of 10~13 μm, comprising two or three M6C·MC carbides, and those tested at 600°C under σ≦1000 MPa were large isolated M6C·MC carbides of about 8 μm. When fatigued at 20°C under all stress amplitudes and at 600°C under σ≧1100 MPa, a crack propagated between two voids, produced by decohesion of the M6C/MC interfaces, in adjacent large two M6C·MC carbides which constitute a carbide aggregate, whereas in the specimens tested at 600°C under σ≦1000 MPa, cracking was initiated from the voids in large isolated M6C·MC carbides of about 8 μm. The fatigue lives of the specimens tested at 600°C under σ≦1000 MPa are shorter because the nucleation of cracks from isolated M6C·MC carbides occurs more rapidly than that of cracks in large M6C·MC carbide aggregates.

収録刊行物

  • 鉄と鋼

    鉄と鋼 95 (9), 655-659, 2009

    一般社団法人 日本鉄鋼協会

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