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Homogenization and Dissolution Kinetics of Fusion Welds in INCONEL® Alloy 740H®

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Abstract

Thermodynamic and kinetic modeling were used to determine appropriate heat treatment schedules for homogenization and second phase dissolution in INCONEL® alloy 740H® (INCONEL and 740H are registered trademarks of Special Metals Corporation) fusion welds. Following these simulations, a two-step heat treatment process was applied to specimens from a single pass gas tungsten arc weld (GTAW). Scanning electron microscopy (SEM) has been used to assess the changes in the distribution of alloying elements as well as changes in the fraction of second phase particles within the fusion zone. Experimental results demonstrate that adequate homogenization of alloy 740H weld metal can be achieved by a 1373 K/4 h (1100 °C/4 h) treatment. Complete dissolution of second phase particles could not be completely achieved, even at exposure to temperatures near the alloy’s solidus temperature. These results are in good agreement with thermodynamic and kinetic predictions.

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Acknowledgments

The authors gratefully acknowledge the financial support of the NSF I/UCRC Center for Integrative Materials Joining Science for Energy Applications (CIMJSEA) under contract #IIP-1034703. They would also like to acknowledge the financial support provided by Special Metals Corporation, Huntington, WV. Additional thanks are given for the technical discussion and assistance provided by Ronnie Gollihue at Special Metals, Jim Tanzosh at Babcock and Wilcox Company, and Paul Mason at ThermoCalc USA.

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Authors and Affiliations

  1. Lehigh University, Bethlehem, PA, 18015, USA

    Daniel H. Bechetti (Research Assistant) & John N. DuPont (Professor)

  2. Special Metals Corporation, Huntington, WV, 25705, USA

    John J. deBarbadillo (Manager, Product & Process Development) & Brian A. Baker (Engineer)

Authors
  1. Daniel H. Bechetti
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  2. John N. DuPont
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  3. John J. deBarbadillo
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  4. Brian A. Baker
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Correspondence to Daniel H. Bechetti.

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Manuscript submitted February 13, 2013.

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Bechetti, D.H., DuPont, J.N., deBarbadillo, J.J. et al. Homogenization and Dissolution Kinetics of Fusion Welds in INCONEL® Alloy 740H® . Metall Mater Trans A 45, 3051–3063 (2014). https://doi.org/10.1007/s11661-014-2243-z

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  • DOI: https://doi.org/10.1007/s11661-014-2243-z

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