Experimental Investigation of Ti-6Al-4V with a Biaxial Tensile Test Setup at Elevated Temperature

Abstract:

The requirement for products to reduce weight while maintaining strength is a major challenge to the development of new advanced materials. Especially in the field of human medicine or aviation and aeronautics new materials are needed to satisfy increasing demands. Therefore the titanium alloy Ti-6Al-4V with its high specific strength and an outstanding corrosion resistance is used for high and reliable performance in sheet metal forming processes as well as in medical applications. Due to a meaningful and accurate numerical process design and to improve the prediction accuracy of the numerical model, advanced material characterization methods are required. To expand the formability and to skillfully use the advantage of Ti-6Al-4V, forming processes are performed at elevated temperatures. Thus the investigation of plastic yielding at different stress states and at an elevated temperature of 400°C is presented in this paper. For this reason biaxial tensile tests with a cruciform shaped specimen are realized at 400°C in addition to uniaxial tensile tests. Moreover the beginning of plastic yielding is analyzed in the first quadrant of the stress space with regard to complex material modeling.

• Periodical: Key Engineering Materials (Volumes 622-623)
• Pages: 273-278
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.622-623.273
• Online since: September 2014
• Authors: Marion Merklein*, Sebastian Suttner, Adam Schaub
• Keywords: Formability, High Performance Metals, Sheet Metal Forming

References

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

[2] R. Boyer, G. Welsch, E. W. Collings, Materials properties handbook: titanium alloys. Metals Park, Ohio: ASM International, (1994).

[3] R. C. Picu, A. Majorell, Mechanical behavior of Ti-6Al-4V at high and moderate temperatures-Part II: constitutive modeling, Mater. Sci. Eng., A 326 (2002) 2 306-316.

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

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

[5] Merklein, M., Hagenah, H., Kaupper, M., Schaub, A.: Mechanical response of Ti-6Al-4V alloy on deformation at moderate temperatures. In: Key Engineering Material, 549 (2013) Trans Tech Publications, S. 311-316.

DOI: 10.4028/www.scientific.net/kem.549.311

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

[7] M. Merklein, M. Biasutti, Development of a Biaxial Tensile Machine for Characterization of Sheet Metals, J. Mater. Process. Technol. 213 (2013) 939-946.

DOI: 10.1016/j.jmatprotec.2012.12.005

[8] DIN 17851: 1990-11: Titanium alloys, chemical composition, German Institute for Standardization, Berlin: Beuth, (1990).

[9] A. Hannon, P. Tiernan, A review of planar biaxial tensile test systems for sheet metal. In: J. Mater. Process. Technol., 198 (2008), 1-13.

DOI: 10.1016/j.jmatprotec.2007.10.015

[10] ISO/FDIS 16842: Metallic materials - Sheet and strip - Biaxial tensile testing method using cruciform specimen (ISO/FDIS 16842: 2014); English version ISO/FDIS 16842: 2014, German Institute for Standardization, Berlin: Beuth, (2014).

DOI: 10.4028/www.scientific.net/kem.613.354

[11] DIN EN ISO 6892-2: 2009: Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature (ISO 6892-2: 2009); German version EN ISO 6892-2: 2009, German Institute for Standardization, Berlin: Beuth, (2009).

DOI: 10.3139/120.110269

[12] S. Suttner, A. Kuppert, Investigation of the beginning of plastic yielding and the hardening behaviour under biaxial tension, Adv. Mat. Res. 769 (2013) 197-204.

DOI: 10.4028/www.scientific.net/amr.769.197

[13] J. E. Hockett, O.D. Sherby, Large strain deformation of polycrystalline metals at low homologous temperatures, J. Mech. Phys. Solids 23 (1975) 87-98.

DOI: 10.1016/0022-5096(75)90018-6