Microstructural Characterization and Tensile Behavior of TA1 Titanium Alloy Sheet Welded by Electron Beam Welding

Abstract:

In the present study, TA1 titanium alloy sheets with a thickness of 0.8mm were welded by electron beam welding. Microstructure of the welded region was investigated using optical microscope and electron backscattered diffraction. Then, the tensile test was conducted to analyse the tensile behavior of the welded sheets as well as the fractography of the fracture surfaces. It is shown that the mean grain size in the heat-affected zone is smaller than that in the fusion zone and base material. The strength of the base metal is lower than that of the fusion zone and heat-affected zone. The average values of the yield strength, tensile strength and elongation of the tensile specimens are 224MPa, 335MPa and 35%, respectively. In addition, the tensile specimens of the welded sheets suffer both ductile and brittle deformation during the tensile tests.

• Periodical: Materials Science Forum (Volume 1027)
• Pages: 149-154
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1027.149
• Online since: April 2021
• Authors: Sen Dong Gu*, Ji Peng Zhao, Rui Jie Ouyang, Yong Hong Zhang
• Keywords: Electron Beam Welding, Microstructure, TA1 Titanium Alloy, Tensile Behavior

References

[1] R. R. Boyer, An overview on the use of titanium in the aerospace industry, Mater. Sci. Eng. A 213 (1996) 103–114.

[2] L. Y. Feng, L. L. Li, Z. Y. Pan, Characteristic study on titanium-liner/carbon-Fiber overwrapped vessels on the satellite, J. Astronautics 35 (2014), 1318-1325.

[3] K. Lu. The Future of Metals. Science 328 (2010), 319-320.

[4] S. Sang, D. Li, C. Wang, et. al, Microstructure and mechanical properties of electron beam welded joints of tantalum and GH3128, Mater. Sci. Eng. A 768 (2019), 138491.

DOI: 10.1016/j.msea.2019.138431

[5] H. J. Liu, L. Zhou, Q. W. Liu, Microstructural characteristics and mechanical properties of friction stir welded joints of Ti–6Al–4V titanium alloy, Mater. Des. 31 (2010), 1650-1655.

DOI: 10.1016/j.matdes.2009.08.025

[6] R.Cao, T.Wang, C.Wang, et. al, Cold metal transfer welding–brazing of pure titanium TA2 to magnesium alloy AZ31B, J. Alloy. Compd. 605 (2014), 12-20.

DOI: 10.1016/j.jallcom.2014.03.051

[7] R. K. Leary, E. Merson, K. Birmingham, et. al, Microstructural and microtextural analysis of InterPulse GTCAW welds in Cp-Ti and Ti–6Al–4V, Mater. Sci. Eng. A 527 (2010), 7694-7705.

DOI: 10.1016/j.msea.2010.08.036

[8] W. Lu, Y. Shi, Y. Lei, et. al, Effect of electron beam welding on the microstructures and mechanical properties of thick TC4-DT alloy, Mater. Des. 34 (2012), 509-515.

DOI: 10.1016/j.matdes.2011.09.004

[9] F. Gao, W. Yu, D. Song, et. al, Fracture toughness of TA31 titanium alloy joints welded by electron beam welding under constrained condition, Mater. Sci. Eng. A 772 (2020), 138612.

DOI: 10.1016/j.msea.2019.138612

[10] M. L. Su, J. N. Li, K. G. Liu, et. al, Mechanical property and characterization of TA1 titanium alloy sheets welded by vacuum electron beam welding, Mater. Sci. Eng. A 159 (2019), 315-318.

DOI: 10.1016/j.vacuum.2018.10.027

[11] R. K. Guptaa, V. Anilkumara, X. Roshan Xavierb, et. al, Electron beam welding study of grade 1 CP Titanium, Mater. Today: Proc. 5 (2018), 8464-8470.

[12] P. S. Lin Prakash, R. Bijoy, K. P. Sushanta, et. al, Mechanical properties and stretch forming behavior of electron beam welded titanium sheets of grade-2 and grade-5, Mater. Today: Proc. 4 (2017) 908-916.

DOI: 10.1016/j.matpr.2017.01.102

[13] M. Y. Wu, R. L. Xin, Y. Wang, et. al, Microstructure, texture and mechanical properties of commercial high-purity thick titanium plates jointed by electron beam welding, Mater. Sci. Eng. A 677 (2016), 50-57.

DOI: 10.1016/j.msea.2016.09.030

[14] P. Luo, D. T. McDonald, W. Xu, et. al, A modified Hall-Petch relationship in ultrafine-grained titanium recycled from chips by equal channel angular pressing, Scr. Mater. 66 (2012), 785-788.

DOI: 10.1016/j.scriptamat.2012.02.008