Effect of Hydrogen on the Development of Superplastic Deformation in the Submicrocrystalline Ti–6Al–4V Alloy

Abstract:

Hydrogenation effect on the development of superplastic deformation in the submicrocrystalline Ti–6Al–4V alloy at temperatures (0.4–0.5)Т_melt is investigated. Hydrogenation of the submicrocrystalline Ti–6Al–4V alloy to 0.26 mass% during superplastic deformation is found to result in solid solution strengthening, plastic deformation localization, and as a consequence, decrease of the deformation to failure. Possible reasons for the decrease of the flow stress and increase of the deformation to failure in the submicrocrystalline Ti–6Al–4V–0.26H alloy during deformation under conditions of superplasticity and simultaneous hydrogen degassing from the alloy are discussed.

• Periodical: Materials Science Forum (Volumes 838-839)
• Pages: 344-349
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.838-839.344
• Online since: January 2016
• Authors: Galina P. Grabovetskaya, Ekaterina N. Stepanova*, Il'ya V. Ratochka, I.P. Mishin, Olga V. Zabudchenko
• Keywords: Grain Boundary Sliding, Hydrogen, Submicrocrystalline Structure, Superplastic Deformation, Titanium Alloy

References

[1] Matsumoto H., Chiba A., Yoshida K., Lee S. -H., and Ono Y. Ti–6Al–4V alloy with an ultrafine-grained microstructure exhibiting low-temperature-high-strain-rate superplasticity, Mater. Lett. 98 (2013) 209–212.

DOI: 10.1016/j.matlet.2013.02.033

[2] E.V. Naydenkin, I.V. Ratochka, G.P. Grabovetskaya, The aspects of practical application of ultrafine-grained titanium alloys produced severe plastic deformation, Mat. Sci. Forum. 667–669 (2011) 1183–1188.

DOI: 10.4028/www.scientific.net/msf.667-669.1183

[3] O.A. Kaybyshev, F.Z. Utyashev, Superplasticity, Structure Refinement and Treatment of Hard-to-Deform Alloys, Nauka, Moscow (2002).

[4] G.P. Grabovetskaya, E.N. Stepanova, I.V. Ratochka, E.V. Naydenkin, and O.N. Lykova, Structure and mechanical properties of ultrafine-grained Ti–6Al–4V alloy made by applying reversible hydrogen alloying, Inorganic Materials: Applied Research. 4(2) (2013).

DOI: 10.1134/s2075113313020056

[5] I.O. Bashkin, V. Yu. Malyshev, Yu.A. Aksenov, T.E. Antonova, E.G. Ponyatovskii, V.L. Kolmogorov, V.K. Kataya, I.V. Levin, Yu.I. Potapenko, A.N. Trubin, G.G. Taluts, and S.A. Nikitin, Influence of hydrogen on plasticity and resistance of deformation of titanic alloy VT6 at temperatures up to 930°С, Fiz. Met. Metalloved. 5 (1990).

[6] T.G. Langdon, Grain boundary sliding revisited: Developments in sliding over four decades, J. Mater. Sci. 41 (2006) 597–609.

DOI: 10.1007/s10853-006-6476-0

[7] A.M. Lokoshchenko, A.A. Il'in, A.M. Mamonov, and V.V. Nazarov, Experimental and theoretical study of the effect of hydrogen on the creep and long-term strength of VT6 titanium alloy, Russ. Metall. 2 (2008) 142–147.

DOI: 10.1134/s0036029508020109

[8] A.K. Grosh and R. Raj, Grain size distribution effects in superplasticity, Acta Metall. 29 (1981) 607–616.

DOI: 10.1016/0001-6160(81)90142-5

[9] G.P. Grabovetskaya, Creep mechanisms in bulk submicrocrystalline metals under the influence of diffusion fluxes of coating additive atoms, Phys. Mesomech. 8 (2005) 49-60.