TY - JOUR
T1 - Effect of forging temperature on microstructure evolution and tensile properties of Ti-17 alloys
AU - Yamabe-Mitarai, Yoko
AU - Kuroda, Syuji
AU - Motohashi, Norie
AU - Matsumoto, Hiroaki
AU - Miyamoto, Goro
AU - Chandiran, Elango
AU - Yoshida, Yoshinori
AU - Itsumi, Yoshio
N1 - Funding Information:
This work was partly supported by Structural Materials for Innovation, Cross-ministerial Strategic Innovation Promotion Program, Cabinet Office, Government of Japan. We are grateful to Ms. H. Gao and T. Bolotova for performing microstructure observation and analysis by SEM-EBSD and SEM image analysis by OLYMPUS Stream software.
Publisher Copyright:
©2019 The Japan Institute of Metals and Materials.
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
KW - Elongation
KW - Forging temperature
KW - Tensile strength
KW - ¡ phase
KW - ¢-Ti alloy
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U2 - 10.2320/matertrans.ME201911
DO - 10.2320/matertrans.ME201911
M3 - Article
AN - SCOPUS:85071477543
SN - 1345-9678
VL - 60
SP - 1733
EP - 1739
JO - Materials Transactions
JF - Materials Transactions
IS - 9
ER -