Superplasticity in Aeroengine Titanium Alloy VT-9 and its Modified Compositions
Keywords:
Superplastic characteristics, Superplastic forming, Optimum thermomechanical processing
Abstract
The alloy (Ti-6.5AL-3.3 Mo-1.6Zr-O.3Si) is a Soviet composition designated VT-9. Excellent superplastic characteristics found by us in this alloy prompted us to explore the possibility of use of Si-free VT-9 in sheet form for superplastic forming. An optimum thermomechanical processing produced a microstructure that resulted in an elongation of 1700 per cent at a fairly high deformation rate (2 X 10-3 set-1). Thus, the same aeroengine alloy (VT-9) can be used for superplastically formed airframe parts in the Si-free condition. The present study also shows that for making the forming process commercially viable, deformation temperature could be lowered by temporarily alloying with hydrogen in a particular concentration range (0.1 to 0.2 wt per cent).
Published
2014-01-20
How to Cite
Dutta, A., & Birla, N. (2014). Superplasticity in Aeroengine Titanium Alloy VT-9 and its Modified Compositions. Defence Science Journal, 36(2), 179-190. https://doi.org/10.14429/dsj.36.5970
Issue
Section
Special Issue Papers
Copyright (c) 2016 Defence Science Journal
Where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India