Commenced in January 2007
Paper Count: 31584
Effect of Welding Processes on Fatigue Properties of Ti-6Al-4V Alloy Joints
Abstract:This paper reports the fatigue crack growth behaviour of gas tungsten arc, electron beam and laser beam welded Ti-6Al-4V titanium alloy. Centre cracked tensile specimens were prepared to evaluate the fatigue crack growth behaviour. A 100kN servo hydraulic controlled fatigue testing machine was used under constant amplitude uniaxial tensile load (stress ratio of 0.1 and frequency of 10 Hz). Crack growth curves were plotted and crack growth parameters (exponent and intercept) were evaluated. Critical and threshold stress intensity factor ranges were also evaluated. Fatigue crack growth behaviour of welds was correlated with mechanical properties and microstructural characteristics of welds. Of the three joints, the joint fabricated by laser beam welding exhibited higher fatigue crack growth resistance due to the presence of fine lamellar microstructure in the weld metal.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1332494Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 4220
 Qi Yunlian, Deng Ju, Hong Quan, Zeng Liying, Electron beam welding, laser beam welding and gas tungsten arc welding of titanium sheet, Materials Science and Engineering A280 (2000) 177-181.
 N. Saresh, M. Gopalakrishna Pillai and Jose Mathew, Investigations into the effects of electron beam welding on thick Ti-6Al-4V titanium alloy, Journal of Materials Processing Technology 192-193 (2007) 83- 88
 M. Balasubramanian & V. Jayabalan & V. Balasubramanian, a mathematical model to predict impact toughness of pulsed-current gas tungsten arc- welded titanium alloy, Int. J. Adv. Manuf Techno (2008) 35:852-858
 N.J. Noolua,, H.W. Kerra, Y. Zhoua, and J. Xieb, Laser weldability of Pt and Ti alloys, Materials Science and Engineering A 397 (2005) 8-15
 M. Balasubramanian,V. Jayabalan and V. Balasubramanian, Prediction and Optimization of Pulsed Current Gas Tungsten Arc Welding Process Parameters to Obtain Sound Weld Pool Geometry in Titanium Alloy Using Lexicographic Method, ASM International, JMEPEG (2009) 18:871-877
 K. Keshava murthy and S. Sundaresan, Fatigue crack growth behavior in a welded ╬▒ - β Ti-Al-Mn alloy in relation to the microstructural features , Material science and engineering, 1997, A222, 201-211.
 Vikas Kumar Saxena and V.M. Radhakrishnan, Effect of Phase Morphology on Fatigue Crack Growth Behavior of a-b Titanium AlloyÔÇöA Crack Closure Rationale, metallurgical and materials transactions a volume 29A, (1998), 245-261
 V. Sinha, C. Mercer , W.O. Soboyejo ,An investigation of short and long fatigue crack growth behavior of Ti-6Al-4V, Materials Science and Engineering A287 (2000) 30-42
 B.L. Boyce and R.O. Ritchie, Effect of load ratio and maximum stress intensity on the fatigue threshold in Ti-6Al-4V, Engineering Fracture Mechanics 68 (2001) 129-147
 L. W. Tsay, Y.P. Shan, Y.-H. Chao and W. Y. Shu, The influence of porosity on the fatigue crack growth behavior of Ti-6Al-4V laser welds, J Mater Sci (2006) 41:7498-7505
 Y.S. Ding, L.W. Tsay and C. Chen, The effects of hydrogen on fatigue crack growth behaviour of Ti-6Al-4V and Ti-4.5Al-3V-2Mo-2Fe alloys, Corrosion Science, Volume 51, Issue 6, June 2009, Pages 1413- 1419
 Xuedong Wang, Qingyu Shi, Xin Wang and Zenglei Zhang , The influences of precrack orientations in welded joint of Ti-6Al-4V on fatigue crack growth, Materials Science and Engineering: A, Volume 527, Issues 4-5, 15 February 2010, Pages 1008-1015
 Paris P.C and Erdogan F (1963) Basic Engineering, Transaction ASTM Journal, pp (528-534)
 Hellan K (1984) Introduction to Fracture Mechanics, 172-173, 2nd ed., McGraw Hill Book Company, New York.
 ASM Hand Book Volume 9 -Metallography&Microstructures, pp 968- 1015
 ASM Hand Book Volume 6 - Welding, Brazing and Soldering; pp.740- 754, 1289-1230.
 ASM Hand Book Volume 12 - Fractography, pp768-793
 Eripret, C and P. Hornet (1994) Prediction of overmatching effects on the fracture of stainless steel cracked welds, Mis - matching of welds, ESIS 17, Edited by K.H. Schwalbe and M. Kocak, Mechanical Engineering publications, London, pp (685-708).
 Potluri N.B, Ghosh P.K, Gupta P.C and Reddy Y.S (1996) Studies on weld metal characteristics and their influences on tensile and fatigue properties of pulsed current GMA welded Al-Zn-Mg alloy, Welding Research Supplement, pp (62s-70s).
 Ahmed.T, Rack.H.J, Phase transformation during cooling in ╬▒+β titanium alloys.MaterialsScienceandEngineering1998; A243:206-11.
 Mohandas T, Banerjee D, Kutumba Rao VV.,Fusion zone microstructure and porosity in electron beam welds of an a + b titanium alloy. Metal Trans 1998; 30A:789-98.
 A.W. Thompson and J.C. Chesnutt, Metall. Trans. A, Vol 10A, 1979, p 1193
 G.Magudeeswaran, V.Balasubramanian, T.S.Balasubramanian and G.Madhusudhan Reddy, Effect of welding consumables on tensile impact properties of shielded metal arc welded high strength, quenched and tempered steel joints, Science and Technology of Welding and Joining, 2008, Vol 13, pp 97-105
 A. Berg, J. Kiese and L. Wagner: in Light-Weight Alloys for Aerospace Applications III, E.W. Lee, K.V. Jata, N.J. Kim and W. E. Frazier (eds.), TMS (1995) 407
 Titanium and titanium alloys (Fundamentals and applications), Edited by C. Leyens and M.