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Analysis and constitutive modelling of high strain rate deformation behaviour of wire–arc additive-manufactured ATI 718Plus superalloy

  • G. AsalaEmail author
  • J. Andersson
  • O. A. Ojo
ORIGINAL ARTICLE
  • 27 Downloads

Abstract

A fundamental prerequisite for obtaining realistic finite element simulation of machining processes, which has become a key machinability assessment for metals and alloys, is the establishment of a reliable material model. To obtain the constitutive model for wire–arc additive-manufactured ATI 718Plus, Hopkinson pressure bar is used to characterise the flow stress of the alloy over a wide range of temperatures and strain rates. Experiment results show that the deformation behaviours of as-deposited ATI 718Plus superalloy are influenced by the applied strain rate, test temperature and strain. Post-deformation microstructures show localised deformation within the deposit, which is attributable to the heterogeneous distribution of the strengthening precipitates in as-deposited ATI 718Plus. Furthermore, cracks are observed to be preferentially initiated at the brittle eutectic solidification constituents within the localised band. Constitutive models, based on the strain-compensated Arrhenius-type model and the modified Johnson–Cook model, are developed for the deposit based on experimental data. Standard statistical parameters, correlation coefficient (R), root-mean-square error (RMSE) and average absolute relative error (AARE) are used to assess the reliability of the models. The results show that the modified Johnson–Cook model has better reliability in predicting the dynamic flow stress of wire–arc-deposited ATI 718Plus superalloy.

Keywords

Additive manufacturing High strain rates Machining Ni-based superalloys Constitutive modelling Johnson–Cook 

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Notes

Acknowledgments

Financial support from the Natural Sciences and Engineering Research Council of Canada is gratefully acknowledged. One of the authors (Gbenga Asala) also acknowledges the award of the University of Manitoba Graduate Fellowship during his Ph.D. programme.

References

  1. 1.
    Cao WD, Kennedy RL (2004) Role of chemistry in 718 type alloys—Allvac® 718Plus™ development. Superalloys 2004. TMS (The Minerals, Metals & Materials Society), Seven SpringsGoogle Scholar
  2. 2.
    Jeniski RA Jr, Kennedy RL (2006) Development of ATI Allvac® 718Plus® alloy and applications. Symposium on recent advantages of Nb-contain materials in EuropeGoogle Scholar
  3. 3.
    English CL, Tewari SK, Abbott DH (2010) An overview of Ni base additive fabrication technologies for aerospace applications. In: 7th International Symposium on Superalloy 718 and Derivative. TMS, Pittsburgh, PAGoogle Scholar
  4. 4.
    Williams SW, Martina F, Addison AC, Ding J, Pardal G, Colegrove P (2015) Wire+arc additive manufacturing. Mater Sci Technol 032:641–647CrossRefGoogle Scholar
  5. 5.
    Arrazola PJ, Özel T, Umbrello D, Davies M, Jawahir IS (2013) Recent advances in modelling of metal machining processes. CIRP Ann Manuf Technol 62:695–718CrossRefGoogle Scholar
  6. 6.
    Jafarian F, Imaz Ciaran M, Umbrello D, Arrazola PJ, Filice L, Amirabadi H (2014) Finite element simulation of machining Inconel 718 alloy including microstructure changesGoogle Scholar
  7. 7.
    Johnson GR, Cook WH (1985) Fracture characteristics of three metals subjected to various strains, strain rates, temperature and pressure. Eng Fract Mech 21:31–45CrossRefGoogle Scholar
  8. 8.
    Sellars C, McTegart WJ (1966) On the mechanism of hot deformation. Acta Metall 14:1136–1138CrossRefGoogle Scholar
  9. 9.
    Lin YC, Chen X-M, Liu G (2010) A modified Johnson-Cook model for tensile behaviors of typical high-strength alloy steel. Mater Sci Eng A 527:6980–6986CrossRefGoogle Scholar
  10. 10.
    Wang X, Huang C, Zou B, Liu H, Zhu H, Wang J (2013) Dynamic behavior and a modified Johnson–Cook constitutive model of Inconel 718 at high strain rate and elevated temperature. Mater Sci Eng A 580:385–390CrossRefGoogle Scholar
  11. 11.
    Zhao Y, Sun J, Li J, Yan Y, Wang P (2014) A comparative study on Johnson-Cook and modified Johnson-Cook constitutive material model to predict the dynamic behavior laser additive manufacturing FeCr alloyGoogle Scholar
  12. 12.
    Couque H, Boulanger R, Bornet F (2006) A modified Johnson-Cook model for strain rates ranging from 10−3 to 105 s−1. J Phys IV France 134:87–93CrossRefGoogle Scholar
  13. 13.
    He A, Xie G, Zhang H, Wang X (2013) A comparative study on Johnson-Cook, modified Johnson-Cook and Arrhenius-type constitutive models to predict the high temperature flow stress in 20CrMo alloy steel. Mater Des 52:677–685CrossRefGoogle Scholar
  14. 14.
    Xue J, Zhang A, Li Y, Qian D, Wan J, Qi B, Tamura N, Song Z, Chen K (2015) A synchrotron study of microstructure gradient in laser additively formed epitaxial Ni-based superalloy. Sci Rep 5:14903CrossRefGoogle Scholar
  15. 15.
    Zhang D-N, Shangguan Q-Q, Xie C-J, Liu F (2015) A modified Johnson-Cook model of dynamic tensile behaviors for 7075-T6 aluminum alloyGoogle Scholar
  16. 16.
    Zener C, Hollomon JH (1944) Effect of strain rate upon plastic flow of steel. J Appl Phys 15:69CrossRefGoogle Scholar
  17. 17.
    Slooff FA, Zhou AJ, Duszczyk AJ, Katgerman AL (2008) Strain-dependent constitutive analysis of three wrought Mg-Al-Zn alloysGoogle Scholar
  18. 18.
    Slooff FA, Zhou J, Duszczyk J, Katgerman L (2007) Constitutive analysis of wrought magnesium alloy Mg-Al4-Zn1. Scr Mater 57:759–762CrossRefGoogle Scholar
  19. 19.
    Lin YC, Chen M-S, Zhong J (2007) Constitutive modeling for elevated temperature flow behavior of 42CrMo steel. Comput Mater Sci 42:470–477CrossRefGoogle Scholar
  20. 20.
    Asala G, Andersson J, Ojo OA (2018) A study of the dynamic impact behaviour of IN 718 and ATI 718Plus® superalloys. Philos Mag 1–19Google Scholar
  21. 21.
    Asala G, Andersson J, Ojo OA (2018) Improved dynamic impact behaviour of wire-arc additive manufactured ATI 718Plus. Mater Sci Eng A. In PressGoogle Scholar
  22. 22.
    Asala G, Khan AK, Andersson J, Ojo OA (2017) Microstructural analyses of ATI 718Plus? Produced by wire-arc additive manufacturing process. Metall Mater Trans A 48:4211–4228CrossRefGoogle Scholar
  23. 23.
    Trimble D, Shipley H, Lea L, Jardine A, O’Donnell GE (2016) Constitutive analysis of biomedical grade Co-27Cr-5Mo alloy at high strain rates. Mater Sci Eng A. 682:466–474CrossRefGoogle Scholar
  24. 24.
    Kennedy RL (2005) Allvac ® 718Plus™, superalloy for the next forty years. Superalloys 718, 625, 706 and derivatives. TMS, PittsburghGoogle Scholar

Copyright information

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

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringUniversity of ManitobaWinnipegCanada
  2. 2.Department of Engineering ScienceUniversity WestTrollhättanSweden

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