Investigation on Constitutive Equations for TA15 during Hot Working

Abstract:

Hot compression tests were conducted on Gleeble-1500 thermal simulator for TA15 titanium alloy at temperatures of 750~1050 °C and at strain rate of 0.001 ~ 1 s with a deformation reduction of 60%. The results show that the flow stress of TA15 titanium alloy increases rapidly to a peak with deformation strain, then decreases to a saturation status. The steady and peak stress significantly decreases with deformation temperature increasing and strain rate decreasing. The activation energies (Q) are 619.264kJ/mol in (α+β) phase and 522.58kJ/mol in β phase, respectively. It was found that the parameters, peak stress σp, steady stress σres, peak strain εp and steady strain εres, have linear relationships with Zenner-Hollomon parameter, Z.

• Periodical: Applied Mechanics and Materials (Volumes 184-185)
• Pages: 1492-1496
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.184-185.1492
• Online since: June 2012
• Authors: Yan Shu Zhang, Yan Sun
• Keywords: Activation Energy (Q), Constitutive Equation, Hot Compression, TA15 Alloy

References

[1] Q. Hong, Z.Q. Zhang, Journal of Aeronautical Materials 21 (1) (2001) 10–12.

[2] W.C. Xu, D.B. Shan, CF. Li, et al., Journal of Aeronautical Materials 8 (4) (2005) 10–15.

[3] PengY.P., CengF.C. WangJ.J. The application and characteristics analysis of the development of titanium alloy used in foreign airlines [J]. Materials engineering, 1997(10)：3-6.

[4] SEO S, MIN O, YANG H. Constitutive equation for Ti-6Al-4V at high temperatures measured using the SHPB technique [J]. Int J Impact Eng, 2005, 31(6): 735-754.

DOI: 10.1016/j.ijimpeng.2004.04.010

[5] QuYin change, SunJianKe, MengXiangJun. Research on hot compressive deformation behavior of Tc4 alloy [J]. Materials development and application, ，2006 , 21(2): 24-29.

[6] LI M Q, PAN H S, LIN Y Y, LUO J. High temperature deformation behavior of near alpha Ti-5. 6Al-4. 8Sn-2. 0Zr alloy [J]. J Mater Process Tech, 2007, 183(1): 71-76.

DOI: 10.1016/j.jmatprotec.2006.10.002

[7] KIM J H, SEMIATIN S L, LEE C S. Constitutive analysis of the high-temperature deformation of Ti-6Al-4V with a transformed microstructure[J]. Acta Meter, 2003, 51(18): 5613-5626.

DOI: 10.1016/s1359-6454(03)00426-9

[8] ZhangXiaoLou, lee pay countries, at al. The study on hot forming performance of TC4 alloy based on the hot working diagram [J]. Journal of aviation materials, 2007, 27(5): 40-44.

[9] KIM J H, SEMIATIN S L, LEE C S. Constitutive analysis of the high-temperature deformation mechanisms of Ti-6Al-4V andTi-6. 85-1. 6V alloys [J]. Mater Sci Eng A, 2005, 394(1/2): 366-375.

DOI: 10.1016/j.msea.2004.11.061