Mechanical Response of Ti-6Al-4V Alloy on Deformation at Moderate Temperatures

Abstract:

Due to beneficial characteristics such as high specific strength, corrosion resistance and biocompatibility Ti-6Al-4V alloy has become the most important industrially produced titanium alloy during the last decades. Commonly used for aerospace technology and medical products, nowadays Ti-6Al-4V covers 50% of the worldwide produced titanium alloy parts. Different deformation operations as forging and casting as well as machining are used to shape titanium alloy components. For sheet metals, cost and time of fabrication can be reduced significantly via the near net shape technology sheet metal forming. Materials such as the α + β alloy Ti-6Al-4V with high yield stress and comparatively low elastic modules need to be formed at elevated temperatures to increase their formability. Numerical simulations are applied to calculate the forming behavior during the process and conclude the characteristics of the shaped part. Therefore in this paper the mechanical behavior of this titanium alloy is investigated by uniaxial tensile test within elevated temperatures ranging from 250 to 500 °C. Finally, the experimental results are adapted to models which predict the flow response in order to describe material behavior in finite element analysis of the forming process.

• Periodical: Key Engineering Materials (Volume 549)
• Pages: 311-316
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.549.311
• Online since: April 2013
• Authors: Marion Merklein, Hinnerk Hagenah, Markus Kaupper, Adam Schaub
• Keywords: Plastic Deformation, Temperature Effects, Tensile Test, Ti-6Al-4V Alloy

References

[1] Peters, M., Leyens, C.: Titan und Titanlegierungen. Weinheim: WILEY-VCH Verlag GmbH (2002)

[2] Lütjering, G., Williams, J. C.: Titanium. Engineering Materials, Processes, Berlin, Heidelberg: Springer-Verlag (2007)

[3] Banabic, D.: Sheet Metal Forming Processes: Constitutive Modelling and Numerical Simulation. Berlin, Heidelberg: Springer-Verlag (2010)

[4] Lange, K.: Umformtechnik - Handbuch für Industrie und Wissenschaft. Band 1: Grundlagen. Berlin: Springer-Verlag (2002)

[5] Swift, H. W.: Plastic instability under plane stress. Journal of the Mechanics and Physics of Solids, volume 1, No. 1 (1952), pp.1-18

[6] Lee, W.-S., Lin, M.-T.: The effects of strain rate and temperature on the compressive deformation behaviour of Ti-6Al-4V alloy. Journal of Materials Processing Technology, volume 71, No. 2 (1997), pp.235-246

DOI: 10.1016/s0924-0136(97)00080-0

[7] Follansbee, P. S., Gray, G. T.: An analysis of the low temperature, low and high strain-rate deformation of Ti−6Al−4V. Metallurgical Transactions A, volume 20, No. 5 (1989), pp.863-874

DOI: 10.1007/bf02651653

[8] Picu, R. C., Majorell, A.: Mechanical behavior of Ti–6Al–4V at high and moderate temperatures—Part II: constitutive modeling. Materials Science and Engineering: A, volume 326, No. 2 (2002), pp.306-316

DOI: 10.1016/s0921-5093(01)01508-8

[9] Kim, J. H., Semiatin, S. L., Lee, C. S.: Constitutive analysis of the high-temperature deformation mechanisms of Ti–6Al–4V and Ti–6.85Al–1.6V alloys. Materials Science and Engineering: A, volume 394, No. 1–2 (2005), pp.366-375

DOI: 10.1016/j.msea.2004.11.061

[10] Johnson, G., Cook, W.: A constitutive model and data for metals subjected to large strains, high strain rates and high temperatures. Engineering Fracture Mechanics, volume (1985)

DOI: 10.1016/0013-7944(85)90052-9

[11] Nemat-Nasser, S., Guo, W.-G., Nesterenko, V. F., Indrakanti, S. S. et al.: Dynamic response of conventional and hot isostatically pressed Ti–6Al–4V alloys: experiments and modeling. Mechanics of Materials, volume 33, No. 8 (2001), pp.425-439

DOI: 10.1016/s0167-6636(01)00063-1

[12] Majorell, A., Srivatsa, S., Picu, R. C.: Mechanical behavior of Ti–6Al–4V at high and moderate temperatures—Part I: Experimental results. Materials Science and Engineering: A, volume 326, No. 2 (2002), pp.297-305

DOI: 10.1016/s0921-5093(01)01507-6

[13] DIN EN ISO 6892-1:2009 Metallic materials - Tensile testing - Part 1: Method of test at room temperature, German version EN ISO 6892-1:2009. (2009), Beuth-Verlag: Berlin

[14] DIN EN ISO 6892-2:2011: Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature, German version EN ISO 6892-2:2011. (2011), Beuth-Verlag: Berlin

[15] Lange, K.: Umformtechnik. Handbuch für Industrie und Wissenschaft: Band 3: Blechbearbeitung. Berlin: Springer-Verlag (1990)