Low temperature superplasticity and production of hollow structures out of VT6 titanium alloy

R.Y. Lutfullin1, A.A. Kruglov, M.K. Mukhametrakhimov1, O.A. Rudenko1
1Institute for Metals Superplasticity Problems RAS, Khalturin St. 39, 450001 Ufa, Russia
Abstract
Application of the conventional superplasticity (SP) allows producing the unique hollow structures. One remarkable example is the hollow titanium blade of the air engine fan produced by Rolls-Royce. However, high temperature of Ti-6Al-4V titanium alloy processing (~ 927 °С) limits wide industrial application of the conventional SP. On the base of experimental data examples of superplastic forming (SPF) of hollow structures for aerospace application out of ultrafine-grained (UFG) VT6 (Ti-6Al-4V) titanium alloy by using an effect of low temperature SP are demonstrated. We used two-phase VT6 titanium alloy produced in VSMPO, Verhnyaya Salda, Russia. Investigated VT6 alloy had standard chemical composition according GOST 19807-91. The UFG sheets with a mean grain size of about 0,2 μm were processed by multiple step forging and subsequent isothermal rolling. SPF of UFG sheets was performed at temperatures of 550, 600, 650, 700, 750 and 800°C. Trials on SPF within the temperature range of 550 – 800 °C were performed by an original technique using special model parts. Investigated sheets showed good processing properties. The use of the low temperature SP provides high quality of hollow components such as blades. Application of low temperature SP can be a basis for creation of economically efficient SPF technologies for producing hollow structures out of UFG titanium Ti-6Al-4V system alloys.
Accepted: 26 May 2015
Views: 1141   Downloads: 478
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Сисанбаев А.В., Круглов А.А., Лутфуллин Р.Я., Химическая физика и мезоскопия 17(4), 595-598 (2015).