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Metallurgical and Materials Transactions A

, Volume 45, Issue 7, pp 3051–3063 | Cite as

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

  • Daniel H. BechettiEmail author
  • John N. DuPont
  • John J. deBarbadillo
  • Brian A. Baker
Article

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.

Keywords

Weld Metal Post Weld Heat Treatment Interdendritic Region Post Weld Heat Treatment Dendrite Core 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

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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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2014

Authors and Affiliations

  • Daniel H. Bechetti
    • 1
    Email author
  • John N. DuPont
    • 1
  • John J. deBarbadillo
    • 2
  • Brian A. Baker
    • 2
  1. 1.Lehigh UniversityBethlehemUSA
  2. 2.Special Metals CorporationHuntingtonUSA

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