Characterization of Hot Deformation Behavior of TC18 Titanium Alloy

Abstract:

In this work, hot compression tests on columniform TC18 titanium alloy specimens were performed with a Gleeble^® 3500 thermal and mechanical simulator in the temperature range of 820-875 °C and at constant strain rates of 0.01, 0.1 and 1 s⁻¹. Relationship model of true stress versus true strain as well as peak stress versus deformation temperature were established, and microstructural micrographs of TC18 titanium alloy were analyzed. The results showed that the flow stress decreased as the deformation temperature increased or the strain rate decreased. Besides, the deformation resistance at temperature above T_β (β transus temperature) was obviously lower than that at below T_β. In addition, flow stresses kept almost constant when it deformed in β region where hot deformation mechanism is DRV, but significant flow softening occurred in α+β region, where deformation mechanism is mainly dominated by DRX. And in α+β region, DRX is prone to occur at a low strain rate, and it is difficult for DRX to occur at high strain rate.

• Periodical: Materials Science Forum (Volume 815)
• Pages: 263-267
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.815.263
• Online since: March 2015
• Authors: Qing Chuan Yang, Ke Hui Qiu*, Ren Gui Jiang, De Ming Huang, Hua Lin He
• Keywords: Flow Behavior, Hot Deformation, Kinetic Analysis, Microstructure Evolution, TC18 Alloy

References

[1] Lanlan Y, Xiaonan M, Yongqing Z, et al: Rare Metal Materials and Engineering Vol. 36 (2007) 505.

[2] Eylon. D, Fujishiro. S, Postans. P. J, et al: JOM Vol. 36(11) (1984), pp.55-62.

[3] P. R. Boyer: Beta Titanium Alloy in the 1990's-Titanium Committee of TMS (2003).

[4] Shen G, Furrer D, Rollins J: Microstructural development in a titanium alloy, WEISS. I, Advances in the Science and Technology of Titanium Alloy Processing, Warrendale, The Minerals, Metals & Materials Society, 1997, pp.75-82.

[5] Warchomicka. F, Stockinger. M, Degischer. H. P, Quantitative analysis of the microstructure of near titanium alloy during compression tests, J. Journal of Materials Processing Technology. 177 (2006) 473-477.

DOI: 10.1016/j.jmatprotec.2006.04.022

[6] G. Ying, Deformation Behavior and Processing Map of High Temperature of TC21 Titanium Alloy, J. Applied Mechanics and Materials. 274 (2013) 427-431.

DOI: 10.4028/www.scientific.net/amm.274.427

[7] Q. R. Wang, A. X. Sha, X. W. Li, et al, Analysis of Hot Deformation Dynamics of TC18 Titanium Alloy, J. Materials Science Forum Vols. 747-748 (2013) 878-884.

DOI: 10.4028/www.scientific.net/msf.747-748.878

[8] J. K. Fan, H. C. Kou, M. J. Lai, et al, Characterization of hot deformation behavior of a new near beta titanium alloy: Ti-7333, J. Materials and Design. 49 (2013) 945-952.

DOI: 10.1016/j.matdes.2013.02.044

[9] Wang. X, Jahazi. M, Yue. S, Substructure of high temperature compressed titanium alloy, J. Mater. Sci. Eng. A. 434 (2006) 188-93.

DOI: 10.1016/j.msea.2006.06.119

[10] H. Q. Chen, C. X. Cao, Characterization of hot deformation microstructures of alpha-beta titanium alloy with equiaxed structure, J. Sci. Trans. Nonferrous Met. Soc. China. 22 (2012) 503-509.

DOI: 10.1016/s1003-6326(11)61205-3