Materials Transactions, Vol.54 No.03 (2013) pp.319-325
© 2013 The Japan Institute of Metals
Relationship between Microstructure and Notch Tensile Strength in Ti-15V-3Cr-3Sn-3Al Alloy at Elevated Temperatures
Institute of Materials Engineering, National Taiwan Ocean University, Keelung, 20224, Taiwan, R. O. C.
The notch tensile strength (NTS) of Ti-15V-3Cr-3Sn-3Al (Ti-15-3) aged at temperatures ranging from 426 to 600°C was determined at elevated temperatures, and correlated to microstructure. Notch tensile tests were conducted in laboratory air at the room temperature, 150, 300 and 450°C. The base metal specimen aged at 426°C formed elongated α precipitates interlocked in a basket-weave like structure and then had peak hardness but inferior notch tensile strength at room temperature due to the trans-granular quasi-cleavage fracture seperated along the α/β interface in the aged specimen. As the aging and test temperature increased, the coarse Widmanstätten α in the specimen aged at 540°C was facilitated to perform high NTS owing to crack deflection or microcrack formation in Ti-15-3 alloy under 300°C, while the improved ductility and notch blunting of the specimen aged at 426°C reduced the notch brittleness and resulted in a remarkably improved NTS tested at 450°C. The NTS of the specimen aged at 426°C was much higher than that of the other aged specimen tested at 450°C. This result suggested that the basket-weave-like structure was more resistant to the softening of substance than the coarse Widmansttäten structure at 450°C.
(Received 2012/09/03; Accepted 2012/12/10; Published 2013/02/25)
Keywords: titanium-15vanadium-3chromium-3aluminum-3tin, microstructure, notch tensile strength, fracture
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