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题名: Relationship between microstructure and notch tensile strength in Ti-15V-3Cr-3Al-3Sn alloy at elevated temperature
作者: R.-T. Huang
W.-H. Chen
L. W. Tsay
贡献者: 國立臺灣海洋大學:光電與材料科技學系
关键词: titanium–15vanadium–3chromium–3aluminum–3tin
microstructure
notch tensile strength
fracture
日期: 2013-06
上传时间: 2018-08-15T01:31:12Z
出版者: Materials Transactions
摘要: Abstract: 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.
關聯: 54(3) pp.319-325
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/48165
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