Weldability and microstructural variations in weldments of Ti-5Ta-1.8Nb alloy

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

The successful replacement of the present generation of corrosion-resistant materials (nitric acid-grade stainless steel and Ti) by Ti-5Ta-1.8Nb, which has better corrosion resistance, depends on its weldability characteristics. This article presents the results of a study on the fabrication, qualification, and microstructural characterization of the welds. Welding was carried out using the direct current electrode negative (DCEN) polarity tungsten inert gas (TIG) (manual) welding method with high-purity Ar shielding. Testing was carried out as per the ASME standard (section IX, welding and brazing). Qualification tests found that the weldment met the required properties. The weldment showed heterogeneous microstructures, which are rationalized based on differences in phase transformation mechanisms that are dictated by the thermal cycles experienced by various microscopic regions. The results, described in this article, confirm that the weldability of the developmental Ti-Ta-Nb alloy is excellent. A preliminary evaluation of the corrosion behavior of the welds showed rates comparable to that of the base metal, establishing that this alloy could be considered as an alternative material for use in highly corrosive environments.

This is a preview of subscription content, log in to check access.

References

  1. 1.

    B. Raj, U.K. Mudali, T. Jayakumar, K.V. Kasiviswanathan, and R. Natarajan, Sadhana, Vol 26 (No. 6), 2000, p 519–559

    Google Scholar 

  2. 2.

    U.K. Mudali, R.K. Dayal, and J.B. Gnanamoorthy, J. Mater. Eng. Perform., Vol 4, 1995, p 756–760

    CAS  Google Scholar 

  3. 3.

    U.K. Mudali, R.K. Dayal, and J.B. Gnanamoorthy, J. Nucl. Mater., Vol 203, 1993, p 73–82

    Article  CAS  Google Scholar 

  4. 4.

    H. Nagano, H. Kajimura, and K. Yamanaka, Mater. Sci. Eng. A, Vol A198, 1995, p 127–134

    CAS  Google Scholar 

  5. 5.

    J.D. Destefani, Introduction to Titanium and Titanium Alloys, Metals Handbook, Vol 2, 10th ed., ASM International, 1990, p 586–591

  6. 6.

    A. Takamura, K. Arakawa, and Y. Moriguchi, Corrosion Resistance of Titanium and Titanium-5% Tantalum Alloy in Hot Concentrated Nitric Acid, Proc. Int. Conf. on Science, Technology and Applications of Titanium, R.I. Jaffee and N.E. Promisel, Ed., Pergamon Press, 1970, p 209–216

  7. 7.

    W.A. Baeslack, D.W. Becker, and F.H. Froes, J. Metals, Vol 36, 1984, p 46–58

    CAS  Google Scholar 

  8. 8.

    S. Sundaresan, G.D. Janaki Ram, and G. Madhusudhan Reddy, Mater. Sci. Eng. A, Vol 262, 1999, p 88–100

    Article  Google Scholar 

  9. 9.

    K. Kapoor, V. Kain, T. Gopalkrishna, T. Sanyal, and P.K. De, J. Nucl. Mater., Vol 322, 2003, p 36–44

    Article  ADS  CAS  Google Scholar 

  10. 10.

    R. Mythili, V. Thomas Paul, S. Saroja, M. Vijayalakshmi, and V.S. Raghunathan, Study of Transformation Behavior in a Ti-4.4Ta-1.9Nb Alloy, J. Mater. Sci. Eng. A, Vol 390, 2005, p 299–312

    Article  Google Scholar 

  11. 11.

    R. Mythili, S. Saroja, M. Vijayalakshmi, and V.S. Raghunathan, Determination of Processing Window for Hot Working of Ti-5wt%Ta1.8wt%Nb Alloy for Reprocessing Applications, Proc. Conf. on Mater. and Technol. for Nucl. Fuel Cycle, B. Raj, K.B.S. Rao, P. Shankar, and N. Murali, Ed., Board of Research in Nuclear Sciences, Indian Nuclear Society, and Indian Institute of Metals, 2003, p C29–C34

  12. 12.

    R. Mythili, S. Saroja, M. Vijayalakshmi, and V.S. Raghunathan, Design of Heat Treatments for Optimum Microstructure in Ti-5wt%Ta2wt%Nb Alloy, Proc. Conf. on Mater. and Technol. for Nucl. Fuel Cycle, B. Raj, K.B.S. Rao, P. Shankar, and N. Murali, Ed., Board of Research in Nuclear Sciences, Indian Nuclear Society, and Indian Institute of Metals, 2003, p C24–C28

  13. 13.

    T. Karthikeyan, A. Dasgupta, S. Saroja, and M. Vijayalakshmi, Texture Development during β → α Transformation in Severely Cold Rolled Ti-Ta-Nb Alloys Treated Above β Transus, I.D. Garg, Ed., Proc. XXVI Annual Conf. on Elec. Microscy. and Allied Fields, EMSI, 2003, p 197–198

  14. 14.

    T. Karthikeyan, Arup Dasgupta, S. Saroja, M. Vijayalakshmi, A.J. Khan, D. Bhattacharjee, and V.S. Raghunathan, Commun. Mater. Sci. Eng. A., Vol A393, 2005, p 294–302

    Article  CAS  Google Scholar 

  15. 15.

    K. Easterling, Introduction to The Physical Metallurgy of Welding, 2nd ed., Butterworth-Heinemann Ltd., Oxford, UK, 1992.

    Google Scholar 

  16. 16.

    O. Grong, Metallurgical Modelling of Welding, 2nd ed., The Institute of Materials, London, UK, 1997

    Google Scholar 

  17. 17.

    M. Rappaz, S.A. David, J.M. Vitek, and L.A. Boatner, Metall. Trans., Vol 20A, 1989, p 1125–1138

    CAS  Google Scholar 

  18. 18.

    F.J. Gil, M.P. Genebra, J.M. Manero, and J.A. Planell, J. Alloys Compd., Vol 329, 2001, p 142–152

    Article  CAS  Google Scholar 

Download references

Author information

Affiliations

Authors

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Karthikeyan, T., Dasgupta, A., Saroja, S. et al. Weldability and microstructural variations in weldments of Ti-5Ta-1.8Nb alloy. J. of Materi Eng and Perform 14, 241–248 (2005). https://doi.org/10.1361/10599490523391

Download citation

Keywords

  • microstructure
  • solidification
  • titanium
  • Ti-5Ta-1.8Nb
  • weldment
  • weld qualification