Abstract
Diffusion bonding is an effective method that can avoid microcracks and reduce residual stress obtained between dissimilar materials, so it is chosen for the preparation of TiAl/Ti2AlNb annular component. A new diffusion bonding method is proposed to obtain sufficient and adjustable bonding pressure on the annular interface. The bonding interface is designed as oblique surface, which allows TiAl part dropping. The diffusion bonding finite element (FE) model is established, and the influences of dropping distance and cone angle on bonding pressure are investigated and optimized. The results show that the bonding pressure generates after the dropping and gets stable during the holding. Too large cone angle will cause great bonding pressure difference along the interface. Considering the machine precision, the ideal cone angle is 3°. The best dropping distance is about 3–4% of the radius of the Ti2AlNb component, which will obtain sufficient bonding pressure and avoid great stress concentration at the interface.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (No. 51771150), the National key Research and Development Program of China (No. 2016YFB0701303), and the Natural Science Basic Research Project of Shanxi (No. 2018JM5174).
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Zhang, X., Tang, B., Li, J., Kou, H. (2019). The Finite Element Simulation of Diffusion Bonding for TiAl/Ti2AlNb Annular Structural Component. In: Han, Y. (eds) Physics and Engineering of Metallic Materials. CMC 2018. Springer Proceedings in Physics, vol 217. Springer, Singapore. https://doi.org/10.1007/978-981-13-5944-6_49
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DOI: https://doi.org/10.1007/978-981-13-5944-6_49
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