Effect of forging temperature on microstructure evolution and tensile properties of Ti-17 alloys

Yoko Yamabe-Mitarai, Syuji Kuroda, Norie Motohashi, Hiroaki Matsumoto, Goro Miyamoto, Elango Chandiran, Yoshinori Yoshida, Yoshio Itsumi

Research output: Contribution to journalArticle

Abstract

In this study, the microstructure, tensile strength, elongation, and reduction of area of near-¢ Ti alloys (Ti-17) were investigated after being subjected to solution and aging treatments. Ti-17 was forged at temperatures between 700 and 850°C followed by air cooling. Then, the forged Ti-17 was subjected to solution treatment at 800°C for 4 h followed by water quenching and aging treatment at 620°C for 8 h followed by air cooling. Tensile tests were performed at room temperature, 450°C, and 600°C. The change in microstructure at different forging temperatures was exhibited by only the volume fraction and morphology of the grain boundary (GB) ¡ phase. That is, a granular GB ¡ phase was formed in the samples forged at 700 and 750°C. Moreover, a film-like GB ¡ phase was formed in the samples forged at 800 and 850°C. The tensile strength was the same for all the tested samples, indicating that the microstructure has little effect on the tensile strength. The elongation and reduction of area increased with decreasing volume fraction in the GB ¡ phase. It is considered that the film-like morphology slightly improves ductility.

Original languageEnglish
Pages (from-to)1733-1739
Number of pages7
JournalMaterials Transactions
Volume60
Issue number9
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • Elongation
  • Forging temperature
  • Tensile strength
  • ¡ phase
  • ¢-Ti alloy

ASJC Scopus subject areas

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

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  • Cite this

    Yamabe-Mitarai, Y., Kuroda, S., Motohashi, N., Matsumoto, H., Miyamoto, G., Chandiran, E., Yoshida, Y., & Itsumi, Y. (2019). Effect of forging temperature on microstructure evolution and tensile properties of Ti-17 alloys. Materials Transactions, 60(9), 1733-1739. https://doi.org/10.2320/matertrans.ME201911