Microstructure factor of creep behavior in near-α Ti alloy

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationTHERMEC 2021 - International Conference on Processing and Manufacturing of Advanced Materials Processing, Fabrication, Properties, Applications
EditorsMihail Ionescu, Christof Sommitsch, Cecilia Poletti, Ernst Kozeschnik, Tara Chandra
PublisherTrans Tech Publications Ltd
Pages1882-1889
Number of pages8
ISBN (Print)9783035736304
DOIs
Publication statusPublished - 2021
EventInternational Conference on Processing and Manufacturing of Advanced Materials Processing, Fabrication, Properties, Applications, THERMEC 2021 - Vienna, Austria
Duration: 2021 May 102021 May 14

Publication series

NameMaterials Science Forum
Volume1016 MSF
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

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

Keywords

  • Bi-modal structure
  • Creep
  • Deformation mechanism
  • Lamellar structure
  • titanium alloy

ASJC Scopus subject areas

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

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