TY - JOUR
T1 - Correlation between solution treatment temperature, microstructure, and yield strength of forged ti-17 alloys
AU - Yamabe-Mitarai, Yoko
AU - Kuroda, Syuji
AU - Motohashi, Norie
AU - Hiroto, Takanobu
AU - Ishida, Akira
AU - Murakami, Hideyuki
AU - Itsumi, Yoshio
N1 - Funding Information:
Funding: This research was funded by Structural Materials for Innovation, Cross-ministerial Strategic Innovation Promotion Program, Cabinet Office, Government of Japan.
Publisher Copyright:
© 2021 by the authors.
PY - 2021/6/1
Y1 - 2021/6/1
N2 - 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.
AB - 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.
KW - A precipitation
KW - Forging
KW - Near B Ti alloys
KW - Prediction of strength
KW - Tensile strength
KW - Titanium
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U2 - 10.3390/cryst11060625
DO - 10.3390/cryst11060625
M3 - Article
AN - SCOPUS:85107888233
SN - 2073-4352
VL - 11
JO - Crystals
JF - Crystals
IS - 6
M1 - 625
ER -