Microstructure and Mechanical Properties of Multi-Pass Warm Rolled Ti-6Al-4V Alloy of Different Microstructures

Abstract:

In this investigation three kinds of raw microstructure Ti-6Al-4V alloys were studied using two directional rolling on a conventional rolling mill. The effect of deformation on microstructure and mechanical properties has been attempted. Microstructural observation indicated that the size of the lamellar/equiaxed α grain was sharply decreased to submicro after multi-pass warm rolling. Tensile test results showed that the multi-pass warm rolling process was found to have a remarkable strengthening effect. The ultimate tensile strength and yield stress were increased by more than 10% and 25% respectively compared with unidirection rolled specimen, and the elongation has been increased by more than one times, and the maximum is up to 1.58 times. Meanwhile, the difference of the strength and elongation between in rolling direction and in transverse direction has been greatly reduced.

• Periodical: Key Engineering Materials (Volume 716)
• Pages: 871-876
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.716.871
• Online since: October 2016
• Authors: Yong Xu, Xiang Jie Yang*, Dan Ni Du
• Keywords: Mechanical Properties, Microstructure, Multi-Pass Warm Rolled

References

[1] M. Wang, Y.Q. Yang, X. Luo, Research Status in Preparation and Properties of Ultra-fine Grained Ti Alloys, Materials Review 27 (2013) 94-112.

[2] R.Z. Valiev, A.V. Korznikov, R.R. Mulyukov, Structure and properties of ultrafine-grained materials produced by severe plastic deformation, Mater. Sci. Eng. 168 (1932) 141-148.

DOI: 10.1016/0921-5093(93)90717-s

[3] R.Z. Valiev, Structure and mechanical properties of ultrafine-grained metals, Mater. Sci. Eng. A. 234 (1997) 59-66.

[4] R.M. Imayev, V.M. Imayev, G.A. Salishchev, Formation of submicrocrystalline structure in TiAl intermetallic compound, J. Mater. Sci. 27(1992) 4465-4471.

DOI: 10.1007/bf00541580

[5] G.A. Salishchev, O.R. Valiakhmetov, R.M. Galeyev, Formation of submicrocrystalline structure in the titanium alloy VT8 and its influence on mechanical properties, J. Mater. Sci. 28 (1993) 2898-2902.

DOI: 10.1007/bf00354692

[6] Y. Saito, H. Utsunomiya, N. Tsuji, et al., Novel ultra-high straining process for bulk materials - Development of the accumulative roll-bonding (ARB) process, Acta Mater. 47 (1999) 579-583.

DOI: 10.1016/s1359-6454(98)00365-6

[7] K.T. Park, H.J. Kwon, W.J. Kim, et al., Microstructural characteristics and thermal stability of ultrafine grained 6061 Al alloy fabricated by accumulative roll bonding process, Mater. Sci. Eng. A. 316 (2001) 145-152.

DOI: 10.1016/s0921-5093(01)01261-8

[8] S.V. Zherebtsov, M.A. Murzinova, M.V. Klimova, et al., Microstructure evolution during warm working of Ti–5Al–5Mo–5V–1Cr–1Fe at 600 and 800°C, Mater. Sci. Eng. A. 563 (2013) 168-176.

DOI: 10.1016/j.msea.2012.11.042

[9] S. Zherebtsov, M. Murzinova, G. Salishchev, et al., Spheroidization of the lamellar microstructure in Ti–6Al–4V alloy during warm deformation and annealing, Acta Mater. 59 (2011) 4138-4150.

DOI: 10.1016/j.actamat.2011.03.037

[10] H.W. Song, S.H. Zhang, M. Cheng, Dynamic globularization kinetics during hot working of a two phase titanium alloy with a colony alpha microstructure, J. Alloy. Compd. 480 (2009) 922-927.

DOI: 10.1016/j.jallcom.2009.02.059