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Finite element analysis of thermomechanical behavior and residual stresses in cold flowformed Ti6Al4V alloy

  • Abhishek Kumar Singh
  • K. Narasimhan
  • Ramesh SinghEmail author
ORIGINAL ARTICLE
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Abstract

Ti6Al4V alloy is very hard to flowform at room temperature due to its limited ductility. However, it retains excellent adiabatic heat trapping and thermal softening abilities, which can play an important role in improving the formability. In this paper, a 3-D finite element model of backward flowforming with three staggered rollers has been developed in Abaqus/explicit to study the thermomechanical behavior and the residual stress evolution. The model has been validated via flowforming experiments. The role of the heat generation due to plastic deformation is highlighted by comparing a thermomechanical analysis to a purely mechanical analysis without incorporating the additional heat input due to the plastic work. The maximum predicted temperature rise during cold flowforming is 911 °C, which significantly reduces the flow stress in the deformation zone. The two most important factors, which affect the temperature rise in the deformation zone, are friction coefficient and coolant heat transfer coefficient. Hence, a study has been done to assess the sensitivity of the thermomechanical behavior and the residual stresses towards these factors. The friction between the mating surfaces is helpful, but a friction coefficient higher than 0.1 causes through-thickness strain heterogeneity. An increase in the friction coefficient reduces the residual stresses, while an increase in the convective heat transfer coefficient causes a transition from compressive to tensile residual stress along the thickness of the tube.

Keywords

Ti6Al4V alloy Flowforming process Thermomechanical behavior Finite element model Residual stresses Heat transfer 

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Notes

Acknowledgments

The authors acknowledge the cooperation of the Paras Flowform Industries for conducting the flowforming experiments.

References

  1. 1.
    Durfee GL (2010) The importance of adiabatic heating in flowforming Ti-6Al-4V. Adv Mater Process 168:32–36Google Scholar
  2. 2.
    Rusinek A (2012) Temperature increase associated with plastic deformation under dynamic compression. J Theor Appl Mech 50:377–398Google Scholar
  3. 3.
    Karpat Y (2011) Temperature dependent flow softening of titanium alloy Ti6Al4V: an investigation using finite element simulation of machining. J Mater Process Technol 211:737–749.  https://doi.org/10.1016/j.jmatprotec.2010.12.008 CrossRefGoogle Scholar
  4. 4.
    Hua FA, Yang YS, Zhang YN et al (2005) Three-dimensional finite element analysis of tube spinning. J Mater Process Technol 168:68–74.  https://doi.org/10.1016/j.jmatprotec.2004.10.014 CrossRefGoogle Scholar
  5. 5.
    Xia QX, Cheng XQ, Hu Y, Ruan F (2006) Finite element simulation and experimental investigation on the forming forces of 3D non-axisymmetrical tubes spinning. Int J Mech Sci 48:726–735.  https://doi.org/10.1016/j.ijmecsci.2006.01.014 CrossRefGoogle Scholar
  6. 6.
    Shinde H, Mahajan P, Singh AK, Singh R, Narasimhan K (2016) Process modeling and optimization of the staggered backward flow forming process of maraging steel via finite element simulations. Int J Adv Manuf Technol 87:1851–1864.  https://doi.org/10.1007/s00170-016-8559-7 CrossRefGoogle Scholar
  7. 7.
    Xu W, Zhao X, Ma H, Shan D, Lin H (2016) Influence of roller distribution modes on spinning force during tube spinning. Int J Mech Sci 113:10–25.  https://doi.org/10.1016/j.ijmecsci.2016.04.009 CrossRefGoogle Scholar
  8. 8.
    Bylya OI, Khismatullin T, Blackwell P, Vasin RA (2018) The effect of elasto-plastic properties of materials on their formability by flow forming. J Mater Process Technol 252:34–44.  https://doi.org/10.1016/j.jmatprotec.2017.09.007 CrossRefGoogle Scholar
  9. 9.
    Miguélez MH, Zaera R, Molinari A, Cheriguene R, Rusinek A (2009) Residual stresses in orthogonal cutting of metals: the effect of thermomechanical coupling parameters and friction. J Therm Stress 32:269–289.  https://doi.org/10.1080/01495730802637134 CrossRefGoogle Scholar
  10. 10.
    Mahdi M, Zhang LC (1999) Residual stresses in ground components caused by coupled thermal and mechanical plastic deformation. J Mater Process Technol 95:238–245CrossRefGoogle Scholar
  11. 11.
    Hua F, Yang Y, Guo D et al (2004) Elasto-plastic FEM analysis of residual stress in spun tube. J Mater Sci Technol 20:379–382Google Scholar
  12. 12.
    Song X, Fong KS, Oon SR, Tiong WR, Li PF, Korsunsky AM, Danno A (2013) Diametrical growth in the forward flow forming process: simulation, validation, and prediction. Int J Adv Manuf Technol 71:207–217.  https://doi.org/10.1007/s00170-013-5492-x CrossRefGoogle Scholar
  13. 13.
    Noyan IC, Huang TC, York BR (1995) Residual stress/strain analysis in thin films by X- ray diffraction. Crit Rev Solid State Mat Sci 8436:125–177.  https://doi.org/10.1080/10408439508243733 CrossRefGoogle Scholar
  14. 14.
    Cullity BD, Stock SR (2001) Elements of x-ray diffraction, third edition. Prentice-Hall, New YorkGoogle Scholar
  15. 15.
    Noyan IC, Cohen JB (2013) Residual stress: measurement by diffraction and interpretation, materials. Springer, New YorkGoogle Scholar
  16. 16.
    Withers PJ, Bhadeshia HKDH (2001) Residual stress. Part 1—measurement techniques. Mater Sci Technol 17:355–365CrossRefGoogle Scholar
  17. 17.
    Wang L, Long H (2011) A study of effects of roller path profiles on tool forces and part wall thickness variation in conventional metal spinning. J Mater Process Technol 211:2140–2151.  https://doi.org/10.1016/j.jmatprotec.2011.07.013 CrossRefGoogle Scholar
  18. 18.
    Abaqus user’s manual, version 6.14, Dassault Systémes Simulia Corp., Providence, RIGoogle Scholar
  19. 19.
    Parsa MH, Pazooki a M a, Nili Ahmadabadi M (2008) Flow-forming and flow formability simulation. Int J Adv Manuf Technol 42:463–473.  https://doi.org/10.1007/s00170-008-1624-0 CrossRefGoogle Scholar
  20. 20.
    Zhan M, Guo J, Fu MW, Li R, Gao PF, Long H, Ma F (2017) Formation mechanism and control of flaring in forward tube spinning. Int J Adv Manuf Technol 94:59–72.  https://doi.org/10.1007/s00170-017-0690-6 CrossRefGoogle Scholar
  21. 21.
    Wu HB, Zhang SJ (2014) 3D FEM simulation of milling process for titanium alloy Ti6Al4V. Int J Adv Manuf Technol 71:1319–1326.  https://doi.org/10.1007/s00170-013-5546-0 CrossRefGoogle Scholar
  22. 22.
    Johnson GR, Cook WH (1985) Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures. Eng Fract Mech 21:31–48.  https://doi.org/10.1016/0013-7944(85)90052-9 CrossRefGoogle Scholar
  23. 23.
    Khan AS, Sung Suh Y, Kazmi R (2004) Quasi-static and dynamic loading responses and constitutive modeling of titanium alloys. Int J Plast 20:2233–2248.  https://doi.org/10.1016/j.ijplas.2003.06.005 CrossRefzbMATHGoogle Scholar
  24. 24.
    Kalpakjian S, Rajagopal S (1982) Spinning of tubes: a review. J Appl Metalwork 2:211–223.  https://doi.org/10.1007/BF02834039 CrossRefGoogle Scholar
  25. 25.
    Kemin X, Zhen W, Yan L, Kezhi L (1997) Elasto-plastic FEM analysis and experimental study of diametral growth in tube spinning. J Mater Process Technol 69:172–175.  https://doi.org/10.1016/S0924-0136(97)00013-7 CrossRefGoogle Scholar
  26. 26.
    Depriester D, Massoni E (2013) Submicrocristalline structure and dynamic recovery of cold flowformed ELI grade Ti-6Al-4V. Key Eng Mater 554–557:157–168.  https://doi.org/10.4028/www.scientific.net/KEM.554-557.157 CrossRefGoogle Scholar
  27. 27.
    Seshacharyulu T, Medeiros SC, Morgan JT et al (2000) Hot deformation and microstructural damage mechanisms in extra-low interstitial (ELI) grade Ti–6Al–4V. Mater Sci Eng A 279:289–299CrossRefGoogle Scholar
  28. 28.
    Ericsson, T (2002) The effect of final shaping prior to heat treatment, handbook of residual stress and deformation of steel. ASM Int., pp 150–158Google Scholar
  29. 29.
    Mahdi M, Zhang L (1997) Applied mechanics in grindingis—V. Thermal residual stresses. Int J Mach Tools Manuf 37:619–633CrossRefGoogle Scholar
  30. 30.
    Lee MK, Kim GH, Kim KH, Kim WW (2006) Effects of the surface temperature and cooling rate on the residual stresses in a flame hardening of 12Cr steel. J Mater Process Technol 176:140–145.  https://doi.org/10.1016/j.jmatprotec.2006.03.119 CrossRefGoogle Scholar
  31. 31.
    Zhang Z, Wang W, Fu H, Xie J (2011) Effect of quench cooling rate on residual stress, microstructure and mechanical property of an Fe–6.5Si alloy. Mater Sci Eng A 530:519–524.  https://doi.org/10.1016/j.msea.2011.10.013 CrossRefGoogle Scholar
  32. 32.
    IIT Kharagpur NPTEL Web Course (2012) Finite element formulation for 3 dimensional elements, NPTEL: National Programme on Technology Enhanced Learning. Available at: https://nptel.ac.in/courses/105105041/31[Accessed 10 Jan. 2019]

Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  • Abhishek Kumar Singh
    • 1
  • K. Narasimhan
    • 1
  • Ramesh Singh
    • 2
    Email author
  1. 1.Department of Metallurgical Engineering and Materials ScienceIndian Institute of Technology BombayMumbaiIndia
  2. 2.Department of Mechanical EngineeringIndian Institute of Technology BombayMumbaiIndia

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