Correlation between Solution Treatment Temperature, MicroStructure, and Yield Strength of Forged Ti-17 Alloys

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) temperatu...

Full description

Saved in:
Bibliographic Details
Published inCrystals (Basel) Vol. 11; no. 6; p. 625
Main Authors Yamabe-Mitarai, Yoko, Kuroda, Syuji, Motohashi, Norie, Hiroto, Takanobu, Ishida, Akira, Murakami, Hideyuki, Itsumi, Yoshio
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.06.2021
Subjects
Alloys
Aviation
Cooling
Correlation
Disks
Ductility
Forging
Investigations
Jet engines
Mechanical properties
Metal fatigue
Microstructure
near β Ti alloys
prediction of strength
Room temperature
Solution heat treatment
Tensile properties
tensile strength
Tensile tests
titanium
Titanium base alloys
Yield strength
α precipitation
Japan
Online AccessGet full text

Cover

More Information
Summary: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 α phase formed during the ST, and the secondary α phase formed during the aging treatment at 620 °C. The yield strength increased with increasing volume fraction of the primary α phase and increased further upon formation of the secondary α phase during the tensile test at room temperature. The correlation of the primary and secondary α 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 α phases.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst11060625