チタン合金の極低温疲労特性に及ぼす切欠きの影響と内部破壊

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  • 由利 哲美
    物質・材料研究機構材料基盤情報ステーション極低温材料グループ
  • 小野 嘉則
    物質・材料研究機構材料基盤情報ステーション極低温材料グループ
  • 緒形 俊夫
    物質・材料研究機構材料基盤情報ステーション極低温材料グループ

書誌事項

タイトル別名
  • Notch Effects on Cryogenic Fatigue Properties of Titanium Alloy and Internal Type Fracture
  • チタン ゴウキン ノ キョクテイオン ヒロウ トクセイ ニ オヨボス キリカキ ノ エイキョウ ト ナイブ ハカイ

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抄録

To evaluate material risk caused by human-error, the notch effects on the fatigue properties of forged Ti-5Al-2.5Sn ELI alloys have been investigated at cryogenic temperatures. Smooth and notched specimens with the Kt=1.5, 2 and 3 were prepared. High-cycle fatigue tests were carried out at 4 K (liquid helium), 77 K (liquid nitrogen) and 293 K (room temperature). The S-N curves of each specimen shifted to higher stress level with a decrease of the test temperature. At 4 K, the fatigue strength of the Kt=3 specimens were substantially lower than those of the smooth specimens. Although the notch effects on the fatigue properties of the Kt=1.5 and the Kt=2 notched specimens are not clear or significant. Fatigue crack initiation sites of the smooth and the Kt=1.5 notched specimens were in the specimen interior (internal type fracture) and those of the Kt=2 and the Kt=3 notched specimens were at the notch root (surface type fracture). The location of the fatigue crack initiation sites showed transition from the internal type fracture for the Kt=1.5 notched specimens to the surface type fracture for the Kt=2 notched specimens. Therefore, the Kt values of the internal fatigue crack initiation sites correspond between 1.5 and 2. The sizes of the internal fatigue crack initiation sites were calculated by the \sqrtarea. The \sqrtarea size of the Kt=1.5 notched specimens and smooth specimens were in a similar range and the fatigue strength of the two are not significant.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 67 (9), 494-498, 2003

    公益社団法人 日本金属学会

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