Effect of Pre-weld Solution Treatment on Mechanical Properties and Microstructure of Micro-Plasma Arc Welded Inconel 718

  • Ajit Kumar SahuEmail author
  • Swarup Bag
Conference paper
Part of the Lecture Notes on Multidisciplinary Industrial Engineering book series (LNMUINEN)


Welding of Inconel 718 is always a challenging task due to the presence of complex alloying elements, which segregates in the interdendritic region and form various brittle intermetallic secondary phases. Hence, in the current investigation, an attempt has been made to study the effect of pre-weld solution treatment on micro-plasma arc welded Inconel 718 microstructure and corresponding mechanical properties. Two different quenching medium, i.e., water and air cooling, were considered during the solution treatment at 980 °C to control the initial grain size and mechanical properties of the base material. The results of this study showed that change in quenching medium affected the grain size, tensile strength, yield strength, ductility, and heat input during the micro-plasma welding to achieve full penetration. The full weld penetrations of solution-treated sheets were achieved with lower heat input as compared to the as-received rolled sheets. Lower heat input during welding resulted in refined solidified microstructure and lower segregation in the interdendritic region, hence improving the joint efficiency of the micro-plasma arc welded Inconel 718.


Inconel 718 Micro-plasma welding Laves phase Solution treatment Cooling rate 



The authors gratefully acknowledge the Central Instruments Facility (CIF), Central Workshop, Mechanical Engineering Department, Advanced Welding Laboratory, IIT Guwahati, India, for providing the experimental and analysis facility to carry out this research work.


  1. 1.
    Brooks, J.W., Bridges, P.J.: Metallurgical stability of Inconel alloy 718. Superalloys 88, 33–42 (1988)Google Scholar
  2. 2.
    Radhakrishna, C., Rao, K.P.: Studies on creep/stress rupture behaviour of superalloy 718 weldments used in gas turbine applications. Mater. High Temp. 12, 323–327 (1994)CrossRefGoogle Scholar
  3. 3.
    Cao, X., Rivaux, B., Jahazi, M., Cuddy, J., Birur, A.: Effect of pre- and post-weld heat treatment on metallurgical and tensile properties of Inconel 718 alloy butt joints welded using 4 kW Nd:YAG laser. J. Mater. Sci. 44, 4557–4571 (2009)CrossRefGoogle Scholar
  4. 4.
    Pereira, J.M., Lerch, B.A.: Effects of heat treatment on the ballistic impact properties of Inconel 718 for jet engine fan containment applications. Int. J. Impact Eng 25, 715–733 (2001)CrossRefGoogle Scholar
  5. 5.
    Sims, C.T., Hagel, W.C.: The superalloys-vital high temperature gas turbine materials for aerospace and industrial power. Wiley, Hoboken (1972)Google Scholar
  6. 6.
    Kuo, C.M., Yang, Y.T., Bor, H.Y., Wei, C.N., Tai, C.C.: Aging effects on the microstructure and creep behavior of Inconel 718 superalloy. Mater. Sci. Eng. A 510, 289–294 (2009)CrossRefGoogle Scholar
  7. 7.
    You, X., Tan, Y., Shi, S., Yang, J.-M., Wang, Y., Li, J., You, Q.: Effect of solution heat treatment on the precipitation behavior and strengthening mechanisms of electron beam smelted Inconel 718 superalloy. Mater. Sci. Eng. A 689, 257–268 (2017)CrossRefGoogle Scholar
  8. 8.
    Ram, G.J., Reddy, A.V., Rao, K.P., Reddy, G.M.: Microstructure and mechanical properties of Inconel 718 electron beam welds. Mater. Sci. Technol. 21, 1132–1138 (2005)CrossRefGoogle Scholar
  9. 9.
    Radhakrishnan, B., Thompson, R.G.: A model for the formation and solidification of grain boundary liquid in the heat-affected zone (HAZ) of welds. Metall Mat. Trans. A. 23, 1783–1799 (1992)CrossRefGoogle Scholar
  10. 10.
    Huang, C.A., Wang, T.H., Lee, C.H., Han, W.C.: A study of the heat-affected zone (HAZ) of an Inconel 718 sheet welded with electron-beam welding (EBW). Mater. Sci. Eng. A 398, 275–281 (2005)CrossRefGoogle Scholar
  11. 11.
    Gobbi, S., Zhang, L., Norris, J., Richter, K.H., Loreau, J.H.: High powder CO2 and Nd-YAG laser welding of wrought Inconel 718. J. Mater. Process. Technol. 56, 333–345 (1996)CrossRefGoogle Scholar
  12. 12.
    Radhakrishna, C.H., Rao, K.P.: The formation and control of Laves phase in superalloy 718 welds. J. Mater. Sci. 32, 1977–1984 (1997)CrossRefGoogle Scholar
  13. 13.
    Janaki Ram, G.D., Venugopal Reddy, A., Prasad Rao, K., Madhusudhan Reddy, G.: Control of Laves phase in Inconel 718 GTA welds with current pulsing. Sci. Technol. Weld. Joining 9, 390–398 (2004)CrossRefGoogle Scholar
  14. 14.
    Kou, S.: Welding metallurgy. Wiley, New Jersey, USA (2003)Google Scholar
  15. 15.
    Janaki Ram, G.D., Venugopal Reddy, A., Prasad Rao, K., Reddy, G.M., Sarin Sundar, J.K.: Microstructure and tensile properties of Inconel 718 pulsed Nd-YAG laser welds. J. Mater. Process. Technol. 167, 73–82 (2005)CrossRefGoogle Scholar
  16. 16.
    Mei, Y., Liu, Y., Liu, C., Li, C., Yu, L., Guo, Q., Li, H.: Effect of base metal and welding speed on fusion zone microstructure and HAZ hot-cracking of electron-beam welded Inconel 718. Mater. Des. 89, 964–977 (2016)CrossRefGoogle Scholar
  17. 17.
    Vernot-Loier, C., Cortial, F., Loria, E.A.: Superalloys 718, 625 and various derivatives, pp. 409–422. Miner. Metals Mater. Soc., Warrendale, PA (1991)CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringIndian Institute of Technology GuwahatiGuwahatiIndia

Personalised recommendations