Correlation between solution treatment temperature, microstructure, and yield strength of forged ti-17 alloys

Yoko Yamabe-Mitarai, Syuji Kuroda, Norie Motohashi, Takanobu Hiroto, Akira Ishida, Hideyuki Murakami, Yoshio Itsumi

Research output: Contribution to journalArticlepeer-review

Abstract

The Ti compressor disks of aviation jet engines are produced by forging. Their microstructure, which depends on the forging conditions, strongly affects their mechanical properties. In this study, changes in the microstructure of Ti-17 alloy as a result of different solution-treatment (ST) temperatures and the related tensile yield strengths were investigated to elucidate the correlation between the ST temperature, microstructure, and yield strength. Ti-17 alloys ingots were isothermally forged at 800 C and solution-treated at 750, 800, and 850 C. The microstructure and yield strength were investigated for samples subjected to different ST temperatures. The primary a phase formed during the ST, and the secondary a phase formed during the aging treatment at 620 C. The yield strength increased with increasing volume fraction of the primary a phase and increased further upon formation of the secondary a phase during the tensile test at room temperature. The correlation of the primary and secondary a phases with yield strength was clarified for tensile properties at room temperature, 450, and 600 C. An equation to predict the yield strength was constructed using the volume fraction of the primary and secondary a phases.

Original languageEnglish
Article number625
JournalCrystals
Volume11
Issue number6
DOIs
Publication statusPublished - 2021 Jun 1
Externally publishedYes

Keywords

  • A precipitation
  • Forging
  • Near B Ti alloys
  • Prediction of strength
  • Tensile strength
  • Titanium

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

Fingerprint

Dive into the research topics of 'Correlation between solution treatment temperature, microstructure, and yield strength of forged ti-17 alloys'. Together they form a unique fingerprint.

Cite this