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http://dx.doi.org/10.12656/jksht.2016.29.2.56

Heat-Treated Microstructures of Ti-3Al-2.5V Tube for the Successive Process of Superplastic Hydroforming and Diffusion Bonding  

Bae, Geun-Soo (Dept. of Advanced Materials Engineering, Andong National University)
Lee, Sang-Yong (Dept. of Advanced Materials Engineering, Andong National University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.29, no.2, 2016 , pp. 56-61 More about this Journal
Abstract
Heating experiments using the Ti-3Al-2.5V tube materials in a vacuum furnace have been performed to investigate a pertinent range of working temperatures and holding times for the development of the successive or simultaneous operation of superplastic hydroforming and diffusion bonding. The specimens were heated at $820^{\circ}C$, $870^{\circ}C$ and $920^{\circ}C$ respectively. Holding times at each temperature were varied up to 4 hours. Holding times longer than 1 hour were selected to consider the diffusion bonding process after or during the hydroforming process in the superplastic state. Grain sizes were varied from $5.7{\mu}m$ of the as-received tube to $9.2{\mu}m$ after heating at $870^{\circ}C/4hours$. Homogeneus granular microstructures could be maintained up to $870^{\circ}C$, while microstructures at $920^{\circ}C$ showed no more granular type.
Keywords
Ti-3Al-2.5V tube; Superplastic hydroforming; Diffusion bonding; Microstructure;
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