Microstructure evolution and creep behavior of near-¡ Ti alloy produced by thermomechanical processing

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A microstructure evolution based on the processing and heat-treatment conditions was investigated for Ti-13Al-2Nb-2Zr (at%) alloy, which has a promising oxidation resistance. Three processing temperatures, 900°C and 1000°C in the ¡+¢ phase field, and 1080°C in the ¢ phase field, and two rolling reduction ratios, 93% and 67%, were selected as the processing conditions. In the samples processed and heat-treated in the ¡+¢ phase field, an almost fully equiaxed structure, i.e., the equiaxed or ellipsoid ¡ phase surrounded by the ¢ phase, was formed through furnace cooling, and a bi-modal structure was formed using air cooling. The morphology of the ¡ phase in the near fully equiaxed and lamellar structure depends on the rolling reduction ratio; in other words, the equiaxed and ellipsoid ¡ phases are formed at rolling reduction ratios of 93% and 67%, respectively. The volume fraction of the equiaxed ¡ phase in the bi-modal structure is processed at 900°C, which is higher than that of the bi-modal structure processed at 1000°C despite the same heat-treatment temperature applied. This is because the induced strain when processed at 1000°C is smaller than that when processed at 900°C. By contrast, in the samples processed in the ¢ phase field and heat-treated in either the ¡+¢ or ¢ phase field, a lamellar structure is formed. The creep behavior of the bi-modal structure obtained upon processing at 900°C and 1000°C for up to a 93% rolling reduction ratio was investigated. The creep life of the sample processed at 1000°C was two-times longer than the sample processed at 900°C. This is because a smaller volume fraction of the equiaxed ¡ phase in the sample processed at 1000°C than that of the sample processed at 900°C.

Original languageEnglish
Pages (from-to)2336-2345
Number of pages10
JournalMaterials Transactions
Volume60
Issue number11
DOIs
Publication statusPublished - 2019 Jan 1
Externally publishedYes

Keywords

  • Bi-modal microstructure
  • Creep test
  • Deformation mechanism
  • Equiaxed ¡
  • Thermomechanical processing
  • Titanium alloy
  • ¡+¢ phase

ASJC Scopus subject areas

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

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  • Cite this

    Masuyama, H., Shimagami, K., Toda, Y., Matsunaga, T., Ito, T., Shimojo, M., & Yamabe-Mitarai, Y. (2019). Microstructure evolution and creep behavior of near-¡ Ti alloy produced by thermomechanical processing. Materials Transactions, 60(11), 2336-2345. https://doi.org/10.2320/matertrans.MT-MAW2019010