Microstructure factor of creep behavior in near-α Ti alloy

Haruki Masuyama, Tetsuya Matsunaga, Yoshiaki Toda, Tsutomu Ito, Masayuki Shimojo, Yoko Yamabe-Mitarai

研究成果: Conference contribution

抄録

Heat-resistant Ti-Al-Nb-Zr alloys, which don’t contain Sn, have been designed to obtain good oxidation resistance above 600 °C. In addition, to design Ti alloys with best balance of creep and fatigue properties, prior β grain size which affects fatigue properties and lamellar microstructure which affects creep properties were controlled by heat treatment. In the present study, the effect of microstructure on creep properties of one of the alloys, i.e., Ti-7.5Al-4Nb-4Zr alloy, with the bimodal (B), the lamellar structures in small prior β grains (LS), and the lamellar in large prior β grains (LL) were investigated at 600 °C. The creep deformation mechanism for each microstructure was a powerlaw creep. However, the creep life varied depending on the microstructures. The longest creep life was obtained in LS with prior β grain size of 90 µm and interlamellar spacing of approximately 10 µm, while the shortest creep life was obtained in LL with prior β grain size of 550 µm and fine interlamellar spacing of less than 2~3 µm. This suggests that creep life is more affected by interlamellar spacing than by prior β grain size.

本文言語English
ホスト出版物のタイトルTHERMEC 2021 - International Conference on Processing and Manufacturing of Advanced Materials Processing, Fabrication, Properties, Applications
編集者Mihail Ionescu, Christof Sommitsch, Cecilia Poletti, Ernst Kozeschnik, Tara Chandra
出版社Trans Tech Publications Ltd
ページ1882-1889
ページ数8
ISBN(印刷版)9783035736304
DOI
出版ステータスPublished - 2021
イベントInternational Conference on Processing and Manufacturing of Advanced Materials Processing, Fabrication, Properties, Applications, THERMEC 2021 - Vienna, Austria
継続期間: 2021 5 102021 5 14

出版物シリーズ

名前Materials Science Forum
1016 MSF
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

Conference

ConferenceInternational Conference on Processing and Manufacturing of Advanced Materials Processing, Fabrication, Properties, Applications, THERMEC 2021
CountryAustria
CityVienna
Period21/5/1021/5/14

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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