Ti-5%Al-2.5%Sn ELI合金の高サイクル疲労特性と内部亀裂発生

DOI Web Site Web Site 被引用文献4件 参考文献34件
  • 小野 嘉則
    物質・材料研究機構材料基盤情報ステーション
  • 由利 哲美
    物質・材料研究機構材料基盤情報ステーション
  • 住吉 英志
    物質・材料研究機構材料基盤情報ステーション
  • 松岡 三郎
    物質・材料研究機構材料基盤情報ステーション
  • 緒形 俊夫
    物質・材料研究機構材料基盤情報ステーション

書誌事項

タイトル別名
  • High-Cycle Fatigue Properties and Sub-Surface Crack Initiation in Ti-5%Al-2.5%Sn ELI Alloy
  • Ti 5パーセント Al 2 5パーセント Sn ELI ゴウキン ノ コウサイクル ヒロウ トクセイ ト ナイブ キレツ ハッセイ

この論文をさがす

抄録

High-cycle fatigue properties and crack initiation behavior were investigated in Ti-5%Al-2.5%Sn ELI alloy with a mean alpha grain size of 80 μm, which had been prepared using the same manufacturing process as the material employed for the liquid hydrogen turbo-pump of H-II launch vehicle No. 8. The 0.2% proof stress and the ultimate tensile strength of this alloy increased with decreasing temperature. Fatigue strength in the longer-life region did not increase in response to increments in tensile strength at cryogenic temperatures. This is attributable to the temperature dependence of crack initiation behavior, and indicates that fatigue cracks tend to initiate earlier at lower temperatures. Fatigue cracks initiated in the specimen interior independently of the test temperatures of 4 K, 77 K and 293 K and formed large crack initiation sites consisting of several crystallographic facet-like structures at cryogenic temperatures. Each facet-like structure was formed through transgranular initiation and growth of micro cracks along slip bands. These sub-surface micro cracks initiated separately in the thinner part of the hourglass-type test piece, and propagated to adjacent grains or combined with each other to form a fatigue crack initiation site. On the other hand, there were no facets that could be clearly identified as the crack initiation sites at 293 K.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 67 (8), 391-397, 2003

    公益社団法人 日本金属学会

被引用文献 (4)*注記

もっと見る

参考文献 (34)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ