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HomeMaterials Science ForumMaterials Science Forum Vols. 838-839High-Temperature-Tensile-Deformation Behavior of...

High-Temperature-Tensile-Deformation Behavior of Ti-6Al-4V Alloy with the Acicular α′ Martensite Microstructure

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Abstract:

Titanium alloys are widely used in aerospace components, with the most widely used alloy being (α+β)-type Ti-6Al-4V (hereafter designated as Ti-64) alloy owing to its high specific strength and high formability associated with superplasticity. This work examines the tensile deformation behavior of the Ti-64 alloy with the acicular α′ martensite microstructure tested at from 700°C to 900°C. Higher tensile-elongation and higher strain-rate-sensitivity value are seen in the Ti-64 alloy with the α′ martensite microstructure as compared to that with the lamellar (α+β) microstructure. During deformation of the α′ martensite microstructure at 700°C or 800°C, acicular microstructure evolves into fine equiaxed (α+β) structure, whereas there is no apparent change in microstructure in the case of the lamellar (α+β) starting microstructure. This result indicates that dynamic globularization during deformation is strongly enhanced in the acicular α′ martensite starting microstructure, thereby leading to higher tensile elongation.

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Periodical:

Materials Science Forum (Volumes 838-839)

Pages:

243-248

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.838-839.243

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Online since:

January 2016

Authors:

Takuro Nishihara, Hiroaki Matsumoto, Yohei Iwagaki, Tohru Shiraishi, Yoshiki Ono

Keywords:

Dynamic globularization, Ti-6Al-4V Alloy, α′ Martensite Microstructure

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[1] B. Cantor, H. Assender, and P. Grant: Aerospace materials Institute of Physics Publishing (2001) pp.15-27.

[2] J.W. Edington, K.N. Melton, C.P. Cutler, Superplasticity, Progr. Mater. Sci. 21 (1976) 63-170.

[3] M. Meier, A.K. Mukherjee. In: T.R. McNelly and H.C. Heikkenen, editors. Proceedings of 119th annual meeting of Shaping and Forming Committee. Warrendale (PA): TMS ; 1990. 317-332.

[4] R.S. Mishra, V.V. Stolyarov, C. Echer, R.Z. Valiev, A.K. Mukherjee, Mechanical behavior and superplasticity of a severe plastic deformation processed nanocrystalline Ti–6Al–4V alloy, Mater. Sci. Eng. A298 (2001) 44-50.

DOI: 10.1016/s0921-5093(00)01338-1

[5] Y.G. Ko, W.G. Kim, C.S. Lee, D.H. Shin, Microstructural influence on low-temperature superplasticity of ultrafine-grained Ti–6Al–4V alloy, Mater. Sci. Eng. A410-411 (2005) 156-159.

DOI: 10.1016/j.msea.2005.08.080

[6] A.V. Sergueeva, V.V. Stolyarov, R.Z. Valiev, A.K. Mukherjee, Enhanced superplasticity in a Ti-6Al-4V alloy processed by severe plastic deformation, Scripta Mater., 43 (2000) 819-824.

DOI: 10.1016/s1359-6462(00)00496-6

[7] G.A. Salishchev, R.M. Galeyev, O.R. Valiakhmetov, R.V. Safiullin, R.Y. Lutfullin, O.N. Senkov, F.H. Froes, O.A. Kaibyshev, Equal channel angular extrusion from macro-mechanics to structure formation., J. Mater. Proc. Tech., 116 (2001) 265-268.

DOI: 10.1016/s0924-0136(01)01037-8

[8] H. Matsumoto, K. Yoshida, S.H. Lee, Y. Ono, A. Chiba, 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

[9] H. Matsumoto, L. Bin, S.H. Lee, Y. Li, Y. Ono, A. Chiba, Frequent occurrence of discontinuous dynamic recrystallization in Ti-6Al-4V alloy with a' starting microstructure , Metall. Mater. Trans., A 44 (2013) 3245-3260.

DOI: 10.1007/s11661-013-1655-5

[10] T. Seshacharyulu, S.C. Medeiros, W.G. Frazier, Y.V.R.K. Prasad, Microstructural mechanisms during hot working of commercial grade Ti- 6Al-4V with lamellar starting structure, Mater. Sci. Eng. A325 (2002) 112-125.

DOI: 10.1016/s0921-5093(01)01448-4

[11] T. Seshacharyulu, S.C. Medeiros, W.G. Frazier, Y.V.R.K. Prasad, Hot working of commercial Ti–6Al–4V with an equiaxed α–β microstructure: materials modeling considerations, Mater. Sci. Eng. A284 (2000) 184-194.

DOI: 10.1016/s0921-5093(00)00741-3

[12] Y. Mishin and Chr. Herzig, Diffusion in the Ti-Al System, Acta Mater. 48 (2000) 589-623.

DOI: 10.1016/s1359-6454(99)00400-0

[13] S.L. Semiatin, V. Seetharaman, I. Weiss, Flow behavior and globularization kinetics during hot working of Ti-6Al-4V with a colony alpha microstructure, Mater. Sci. Eng. A263 (1999) 257-271.

DOI: 10.1016/s0921-5093(98)01156-3

[14] H.J. McQueen, J.K. Solberg, N. Ryum, E. Nes, Influence of ultra-high strains at elevated temperatures on the microstructure of aluminium, Philos. Mag. A60 (1989) 473-485.

[15] R.D. Doherty, D.A. Hughes, F.J. Humphreys, J.J. Jonas, D.J. Jensen, M.E. Kassner, W.E. King, T.R. McNelley, H.J. McQueen, A.D. Rollett, Current issues in recrystallization: a review, Mater. Sci. Eng. A238 (1997) 219-274.

DOI: 10.1016/s0921-5093(97)00424-3

[16] R.C. Gifkins In: N.E. Paton, C.H. Hamilton, editors, Superplastic forming of structural alloys. Warrendale: TMS-AIME; 1982. P. 3-26.

[17] J.S. Kim, Y.W. Chang, C.S. Lee, Quantitative analysis on boundary sliding and its accommodation mode during superplastic deformation of two-phase Ti-6Al-4V alloy, Metall. Mater. Trans. 29A (1998) 217-226.

DOI: 10.1007/s11661-998-0174-2