Abstract
Although Ti-6Al-4V titanium can be quickly and easily formed by electric hot incremental forming, the material property is the key factor for industrial application. In the current work, mechanical properties of Ti-6Al-4V sheet in one-sided electric hot incremental forming, such as microstructure, hardness, and tensile strength, were investigated. The results show that the current is obviously the most important factor to elevate temperature, so a higher feed rate can be adopted if the current is increased. In order to keep a constant processing temperature, an online temperature detector and current feedback system should be adopted. After observation and analysis of the microstructure of forming workpieces, the electric hot incremental forming is an integrated process, which involves plastic hardening and annealing. The temperature of the tool–workpiece contact side reached the β-transus one, α phase disappeared, and the basket weave structure was formed because of the fast air-cool. A composite organization with superior property which includes elongated α phase grains and basket weave structure can be acquired by one-sided electric hot incremental forming. If a uniform metal structure is obtained, special heat treatment must be adopted. Micro-hardness analysis shows that electric hot incremental forming is an enhanced processing. In order to improve the tensile strength, the oxidation of sheet must be prevented and inert gas protection should be adopted in future research.
Similar content being viewed by others
References
Ambrogio G, Filice L, Gagliardi F (2012) Formability of lightweight alloys by hot incremental sheet forming. Mater Des 34:501–508
Eylon D, Seagle SR (2000) In: I.V. Gorynin, S.S. Ushkov (Eds.), Titanium 99: Science and Technology, CRISM “PROMETEY”, St. Petersburg, pp 37–41
Lee HS, Yoon JH, Park CH, Ko YG, Shin DH (2007) A study on diffusion bonding of superplastic Ti–6Al–4V ELI grade. J Mater Process Technol 187–188:526–529
Ghosh AK, Hamilton CH (1979) Mechanical behavior and hardening characteristics of a superplastic Ti-6A1-4V alloy. Metall Trans A 10A:699–706
Vanderhasten M, Rabet L, Verlinden B (2008) Ti–6Al–4V: deformation map and modelisation of tensile behaviour. Mater Des 29:1090–1098
Jeswiet J, Micari F, Hirt G, Bramley A, Duflou J, Allwood J (2005) Asymmetric single point incremental forming of sheet metal. Ann CIRP 54(2):623–650
Hussain G, Gao L, Zhang ZY (2008) Formability evaluation of a pure titanium sheet in the cold incremental forming process. Int J Adv Manuf Technol 37:920–926
Leach D, Green AJ, Bramley AN (2001) A new incremental forming process for small batch and prototype parts. Proceedings of the Ninth International Conference on Sheet Metal, Leuven
Amino H, Lu Y, Ozawa S, Fukuda K, Maki T (2002) Dieless NC forming of automotive service panels. In: Proceedings of the Conference on Advanced Techniques of Plasticity: 1015–1020
Ambrogio G, De Napoli L, Filice L, Gagliardi F, Muzzupappa M (2005) Application of incremental forming process for highly customized medical product manufacturing. J Mater Process Technol 162–163:156–162
Maria BS, Peter SN, Bay N, Martins PAF (2011) Failure mechanisms in single-point incremental forming of metals. Int J Adv Manuf Technol 56:893–903
Jacob S, Rajiv M, Liu WK, Jian C (2013) The formability of annealed and pre-aged AA-2024 sheets in single-point incremental forming. Int J Adv Manuf Technol 69:1185–1201
Hussain G, Gao L, Hayat N, Dar NU (2010) The formability of annealed and pre-aged AA-2024 sheets in single-point incremental forming. Int J Adv Manuf Technol 49:543–549
Duflou JR, Callebautl B, Verbert J, De Baerdemaeker H (2007) Laser assisted incremental forming: formability and accuracy improvement. Ann CIRP 56:273–276
Fan GQ, Gao L, Hussain G, Wu ZL (2008) Electric hot incremental forming: a novel technique. Int J MachTools Manuf 48:1688–1692
Fan GQ, Sun FT, Meng XG, Gao L, Tong GQ (2010) Electric hot incremental forming of Ti-6Al-4V titanium sheet. Int J Adv Manuf Technol 49:941–947
Palumbo G, Brandizzi M (2012) Experimental investigations on the single point incremental forming of a titanium alloy component combining static heating with high tool rotation speed. Mater Des 40:43–51
Ambrogio G, Gagliardi F, Bruschi S, Filice L (2013) On the high-speed single point incremental forming of titanium alloys. CIRP Ann Manuf Technol 62:243–246
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Fan, G., Gao, L. Mechanical property of Ti-6Al-4V sheet in one-sided electric hot incremental forming. Int J Adv Manuf Technol 72, 989–994 (2014). https://doi.org/10.1007/s00170-014-5733-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00170-014-5733-7