Skip to main content

Microstructural Evolution of Inconel 625 and Inconel 686CPT Weld Metal for Clad Carbon Steel Linepipe Joints: A Comparator Study

The Effect of Iron Dilution on the Elemental Segregation of Alloying Elements in Nickel Based Filler Metals

We’re sorry, something doesn't seem to be working properly.

Please try refreshing the page. If that doesn't work, please contact support so we can address the problem.

Abstract

Microstructural evolution of Inconel 625 and Inconel 686CPT filler metals, used for the fusion welding of clad carbon steel linepipe, has been investigated and compared. The effects of iron dilution from the linepipe parent material on the elemental segregation potential of the filler metal chemistry have been considered. The results obtained provide significant evidence to support the view that, in Inconel 686CPT weld metal, the segregation of tungsten is a function of the level of iron dilution from the parent material. The data presented indicate that the incoherent phase precipitated in the Inconel 686CPT weld metal has a morphology that is dependent on tungsten enrichment and, therefore, iron dilution. Furthermore, in the same weld metal, a continuous network of finer precipitates was observed. The Charpy impact toughness of each filler metal was evaluated, and the results highlighted the superior impact toughness of the Inconel 625 weld metal over that of Inconel 686CPT.

This is a preview of subscription content, access via your institution.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12
Fig. 13
Fig. 14
Fig. 15
Fig. 16
Fig. 17

References

  1. 1.

    F. J. Xu, Y. H. Lv, B. S. Xu, Y. X. Liu, F. Y. Shu and P. He: Mater. Des., 2013, vol. 45, pp. 446-455.

    Article  Google Scholar 

  2. 2.

    H. R. Zareie Rajani, S. A. A. Akbari Mousavi and F. Madani Sani: Mater. Des., 2013, vol. 43, pp. 467-474.

    Article  Google Scholar 

  3. 3.

    M.C. Maguire, J.R. Michael: in Superalloys 718, 625, 706 and Various Derivatives, E.A. Loria, ed., The Minerals, Metals & Materials Society, Pennsylvania, 1994, pp. 881–92.

  4. 4.

    J. N. DuPont, S. W. Banovic and A. R. Marder: Weld. J., 2003, vol. 82, pp. 125S-135S.

    Google Scholar 

  5. 5.

    S. W. Banovic, J. N. DuPont and A. R. Marder: Sci. Technol. Weld. Joining, 2002, vol. 7, pp. 374-383.

    Article  Google Scholar 

  6. 6.

    M. Cieslak, T. Headley and R. Frank: Weld. J., 1989, vol. 68, pp. 473-482.

    Google Scholar 

  7. 7.

    M. Cieslak: Weld. J., 1991, vol. 70, pp. 49s–56s.

    Google Scholar 

  8. 8.

    J. DuPont: Metall. Mater. Trans. A, 1996, vol. 27, pp. 3612-3620.

    Article  Google Scholar 

  9. 9.

    S. Floreen, G.E. Fuchs, and W.J. Yang: in Superalloys 718, 625, 706 and Various Derivatives, E.A. Loria, ed., The Minerals, Metals and Materials Society, Pennsylvania, 1994, pp. 13–37.

  10. 10.

    C.C. Silva, H.C.D. Miranda, M.F. Motta, J.P. Farias, C.R.M. Afonso, and A.J. Ramirez: J. Mater. Res. Technol., 2013, vol. 2, pp. 228–237.

    Article  Google Scholar 

  11. 11.

    J. N. DuPont, J. C. Lippold and S. D. Kiser: Welding Metallurgy and Weldability of Nickel-Base Alloys, John Wiley & Sons, Hoboken NJ USA, 2009, pp. 47-157.

    Book  Google Scholar 

  12. 12.

    T. S. Edgecumbe, R. B. Rebak and R. R. Seeley: The Minerals-Metals-Materials Society Conference, Lawrence Livermore National Laboratory, St. Louis MO USA, 2000.

    Google Scholar 

  13. 13.

    S.-L. Jeng and Y.-H. Chang: J. Mater. Sci. Eng. A, 2012, vol. 555, pp. 1-12.

    Google Scholar 

  14. 14.

    J. S. Ogborn, D. L. Olson and M. J. Cieslak: Mater. Sci. Eng. A, 1995, vol. 203, pp. 134-139.

    Article  Google Scholar 

  15. 15.

    M. J. Perricone, J. N. DuPont and M. J. Cieslak: Metall. Mater. Trans. A, 2003, vol. 34, pp. 1127-1132.

    Article  Google Scholar 

  16. 16.

    D. Stefanescu: Science and Engineering of Casting Solidification, 2nd ed., Springer, New York, NY, 2009, pp. 135–139.

    Google Scholar 

  17. 17.

    S.V. Nagender Naidum, A.M. Sriramamurthy, and P. Rama Rao: in Alloy Phase Diagrams, vol. 3, H. Baker, ed., ASM International, Materials Park, OH, 1992, pp. 873–74.

  18. 18.

    S. K. Rai, A. Kumar, V. Shankar, T. Jayakumar, K. Bhanu Sankara Rao and B. Raj: Scr. Mater., 2004, vol. 51, pp. 59-63.

    Article  Google Scholar 

  19. 19.

    M. Donachie and S. Donachie: in Superalloys: A Technical Guide, M. Donachie, ed., ASM International, Materials Park, OH, 2002, pp. 218–221.

  20. 20.

    A. Yeh and S. Tin: Metall. Mater. Trans. A, 2006, vol. 37, pp. 2621-2631.

    Article  Google Scholar 

  21. 21.

    F.D.S. Borchardt: Characterization of the Proeutectoid Cementite Networks Observed in the SAE 1092 Wire Rod Steel Grade, University of Pittsburgh, Pittsburgh, 2004, pp. 54–55.

    Google Scholar 

  22. 22.

    M. Ahmad, J. I. Akhter, M. Iqbal, M. Akhtar, E. Ahmed, M. A. Shaikh and K. Saeed: J. Nucl. Mater., 2005, vol. 336, pp. 120-124.

    Article  Google Scholar 

Download references

Acknowledgments

This work was supported by the Pipeline Production Group division of Subsea 7. The author would also like to gratefully acknowledge the support and expertize of the AMRL department of the University of Strathclyde.

Author information

Affiliations

Authors

Corresponding author

Correspondence to Charles A. Maltin.

Additional information

Manuscript submitted May 25, 2013.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Maltin, C.A., Galloway, A.M. & Mweemba, M. Microstructural Evolution of Inconel 625 and Inconel 686CPT Weld Metal for Clad Carbon Steel Linepipe Joints: A Comparator Study. Metall Mater Trans A 45, 3519–3532 (2014). https://doi.org/10.1007/s11661-014-2308-z

Download citation

Keywords

  • Weld Metal
  • Impact Toughness
  • Filler Metal
  • Interdendritic Region
  • Fusion Line