Electron Beam Welding (EBW) is employed to both melt and unite materials, influencing their thermal history and subsequently determining the microstructure and properties of the welded joint. Welding Titanium alloys involves undergoing local melting and rapid solidification, subjecting the material to thermal stresses induced by a thermal expansion coefficient of 9.5 × 10 m/m°C. This process, reaching range temperatures from the full melting alloy to room temperature, results in phase formation dictated by the thermodynamic preferences of the alloyed elements, posing a significant challenge. Recent efforts in simulation and calculations have been undertaken elsewhere to address this challenge. This study focuses on a joint of two plates with differing cross-sectional areas, influencing heat transfer during welding. This report presents a case study focusing on the metallurgical changes observed in the microstructure within the welded zone, emphasizing alterations in the cooling rate of the welded joint. The investigation utilizes optical metallography, Vickers’s Hardness testing, and SEM (scanning electron microscopy) to comprehensively characterize the observed changes in addition to heat transfer simulation of the welded zone.
References
[1]
Inakagi, I., Takechi, T., Shirai, Y. and Ariyasu, N. (2014) Application and Features of Titanium for the Aerospace Industry. Nippon Steel & Sumitomo Metal Technology Report No. 106 July 2014, UDC 669. 295: 629. 735. 3, 22-27. https://www.nipponsteel.com/en/tech/report/nssmc/pdf/106-05.pdf
[2]
Williams, J.C. and Boyer, R. (2020) Opportunities and Issues in the Application of Titanium Alloys for Aerospace Components.Metals, 10, 705. https://doi.org/10.3390/met10060705
[3]
Filice, L., Gagliardi, F., Lazzaro, S. and Rocco, C. (2010) FE Simulation and Experimental Considerations on Titanium Alloy Superplastic Forming for Aerospace Applications. International Journal of Material Forming, 3, 41-46. https://link.springer.com/article/10.1007/s12289-009-0415-y https://doi.org/10.1007/s12289-009-0415-y
[4]
Fang, Y.-J., Jiang, X.-S., Mo, D.-F., Song, T.-F., Shao, Z.-Y., Zhu, D.-G., Zhu, M.-H. and Luo, Z.-P. (2018) Microstructure and Mechanical Properties of Electron Beam-Welded Joints of Titanium TC4 (Ti-6Al-4V) and Kovar (Fe-29Ni-17Co) Alloys with Cu/Nb Multi-Interlayer. Advances in Materials Science and Engineering, 2018, Article ID 2042871. https://doi.org/10.1155/2018/2042871
[5]
Alluaibi, M.H.I., Cojocaru, E.M., Rusea, A., Serban, N., Coman, G. and Cojocaru, V.D. (2020) Microstructure and Mechanical Properties Evolution during Solution and Ageing Treatment for a Hot Deformed, Above β-Transus, Ti-6246 Alloy. Metals, 10, 1114. https://doi.org/10.3390/met10091114
[6]
Alluaibi, M.H., Alturaihi, S.S., Cojocaru, E.M. and Cinca, I. (2019) Microstructural Evaluation During Thermomechanical Processing of Ti-6246 Titanium Alloy. UPB Scientific Bulletin, Series B: Chemistry and Materials Science, 81, 225-234. https://www.researchgate.net/publication/331409347
[7]
Huang, J. (2011) The Characterization and Modelling of Porosity Formation in Electron Beam Welded Titanium Alloys. Doctor Dissertation, The University of Birmingham. https://etheses.bham.ac.uk/id/eprint/3276/1/Huang_12_PhD.pdf
[8]
Mendez, P.F. (2023) Calculation of Thermal Features in Welding and Additive Manufacturing. IOP Conference Series: Materials Science and Engineering, 1281, 012021. https://iopscience.iop.org/article/10.1088/1757-899X/1281/1/012021/pdf https://doi.org/10.1088/1757-899X/1281/1/012021
[9]
Burtscher, M., Weißensteiner, I., Wartbichler, R., Kirchheimer, K., Bernhard, C., Kiener, D. and Clemens, H. (2023) Precipitation Behavior of Hexagonal Carbides in a C Containing Intermetallic γ-Tial Based Alloy. Journal of Alloys and Compounds, 969, Article ID 172400. https://doi.org/10.1016/j.jallcom.2023.172400
[10]
Zhang, J.H., Li, X.X., Xu, D.S. and Yang, R. (2019) Recent Progress in the Simulation of Microstructure Evolution in Titanium Alloys. Progress in Natural Science: Materials International, 29, 295-304. https://doi.org/10.1016/j.pnsc.2019.05.006
[11]
Rai, R., Burgardt, P., Milewski, J.O., Lienert, T.J. and DebRoy, T. (2009) Heat Transfer and Fluid Flow during Electron Beam Welding of 21Cr-6Ni-9Mn Steel and Ti-6Al-4V Alloy. Journal of Physics D: Applied Physics, 42, 025503. https://doi.org/10.1088/0022-3727/42/2/025503
[12]
Pederson, R. (2004) The Microstructures of Ti-6A1-4V and Ti-6Al-2Sn-4Zr-6Mo and Their Relationship to Processing and Properties. Doctoral Thesis, Luleå University of Technology. https://www.diva-portal.org/smash/get/diva2:991452/FULLTEXT01.pdf
[13]
Pederson, R., Niklasson, F., Skystedt, F. and Warren, R. (2012) Microstructure and Mechanical Properties of Friction-and Electron Beam Welded Ti-6Al-4V and Ti-6Al-2Sn-4Zr-6Mo. Materials Science and Engineering A, 552, 555-565. https://doi.org/10.1016/j.msea.2012.05.087
[14]
Greenfield, M.A. and Duvall, D.S. (1975) Welding of an Advanced High Strength Titanium Alloy. Welding Research Supplement, 73-80. https://app.aws.org/wj/supplement/WJ_1975_03_s73.pdf
[15]
Britton, T.B., Dunne, F.P.E. and Wilkinson, A.J. (2015) On the Mechanistic Basis of Deformation at the Microscale in Hexagonal Close-Packed Metals. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 471, 20140881-20140881. https://doi.org/10.1098/rspa.2014.0881 http://rspa.royalsocietypublishing.org/content/471/2178/20140881
