Abstract
In the present study a considerable decrease in the sheet rolling temperature of γ-TiAl based alloy was achieved through grain refinement. The use of preforms with homogeneous micro- and submicrocrystalline structure made possible to perform rolling of γ-TiAl alloy at temperatures as low as 800–1000°C. The decrease in the rolling temperature was directly related to a decrease in the brittle-to-ductile transition temperature. A homogeneous microcrystalline structure was found to be an optimal initial condition for pack rolling at strain rates of about 10−1 s−1. Along with retained fine-grained microstructure in the γ sheets, which provides superior superplastic elongations, the decrease in rolling temperature leads to a substantial decrease in their cost because of energy savings, applicability of cheaper canning materials than those currently being used, less oxidation during preheating and thus a better surface finish.
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Shagiev, M.R., Salishchev, G.A. (2006). Low-Temperature Sheet Rolling of TiAl Based Alloys. In: Zhu, Y.T., Varyukhin, V. (eds) Nanostructured Materials by High-Pressure Severe Plastic Deformation. NATO Science Series, vol 212. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3923-9_13
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DOI: https://doi.org/10.1007/1-4020-3923-9_13
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-3921-8
Online ISBN: 978-1-4020-3923-2
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