β Recrystallisation characteristics of α + β titanium alloys for aerospace applications

Allan, Michael and Thomas, Matthew and Brooks, Jeffery and Blackwell, Paul; Venkatesh, Vasisht and Pilchak, Adam L. and Allison, John E. and Ankem, Sreeramaurthy and Boyer, Rodney and Christodoulou, Julie and Fraser, Hamish L. and Imam, M. Ashraf and Kosaka, Yoji and Rack, Henry J. and Chaterjee, Amit and Woodfield, Andy, eds. (2016) β Recrystallisation characteristics of α + β titanium alloys for aerospace applications. In: Proceedings of the 13th World Conference on Titanium. John Wiley & Sons Inc., USA, pp. 203-208. ISBN 9781119293668 (https://doi.org/10.1002/9781119296126.ch30)

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Abstract

To investigate the recrystallisation characteristics of Ti-6Al-4V and the novel alloy Timetal 575 (Ti575), twelve 100mm diameter double cone samples were forged, sectioned then heat treated in the beta phase field. The double cone geometry chosen provided a gradient of strain in each sample with a strain profile provided by output from a finite element modelling package. The matrix of tests covered three forging temperatures and two deformation rates and was followed by heat treatments to two temperatures for two different times at temperature generating a recrystallised microstructure as a function of these parameters. The extent of microstructural refinement for both alloys was analysed using optical microscopy of the as-received and recrystallised micro-structure.

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