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Characterization of Discontinuous Coarsening Reaction Products in INCONEL® Alloy 740H® Fusion Welds

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Abstract

Characterization of γ′ coarsened zones (CZs) in alloy 740H fusion welds via a variety of electron microscopy techniques was conducted. The effects of solute partitioning during nonequilibrium solidification on the amount of strengthening precipitates along the grain boundaries were evaluated via electron-probe microanalysis and scanning electron microscopy. Electron backscatter diffraction was used to present evidence for the preferential growth of CZs toward regions of lower γ′ content, even if growth in that direction increases grain boundary area. Scanning electron microscopy and image analysis were used to quantify the propensity for CZs to develop along certain segments of the grain boundaries, as governed by the local variations in γ′ content. Scanning transmission electron microscopy with X-ray energy-dispersive spectrometry (XEDS) was used to assess the compositions of the matrix and precipitate phases within the CZs and to quantify the segregation of alloying components to the reaction front. Thermodynamic and kinetic modeling were used to compare calculated and experimental compositions. The work presented here provides new insight into the progression of the discontinuous coarsening (DC) reaction in a complex engineering alloy.

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Notes

  1. INCONEL and 740H are registered trademarks of Special Metals Corporation, Huntington, WV.

  2. NIMONIC is a registered trademark of Special Metals Corporation, Huntington, WV.

  3. JEOL is a trademark of JEOL, Tokyo.

  4. HAYNES and 282 are registered trademarks of Haynes International.

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Acknowledgments

The authors gratefully acknowledge the financial support of the NSF I/UCRC Manufacturing and Materials Joining Innovation Center (Ma2JIC) under Contract No. IIP-1034703. They also acknowledge the financial support provided by Special Metals Corporation and Thermo-Calc software. Special thanks for the technical discussions are given to John Shingledecker and John Siefert, Electric Power Research Institute (Charlotte, NC) and Paul Mason and Kevin Wu (Thermo-Calc).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Lehigh University, Bethlehem, PA, 18015, USA

    Daniel H. Bechetti, John N. Dupont & Masashi Watanabe

  2. Product and Process Development Department, Special Metals Corporation, Huntington, WV, 25705, USA

    John J. de Barbadillo

Authors
  1. Daniel H. Bechetti
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  2. John N. Dupont
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  3. Masashi Watanabe
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  4. John J. de Barbadillo
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Correspondence to Daniel H. Bechetti.

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Manuscript submitted July 19, 2016.

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Bechetti, D.H., Dupont, J.N., Watanabe, M. et al. Characterization of Discontinuous Coarsening Reaction Products in INCONEL® Alloy 740H® Fusion Welds. Metall Mater Trans A 48, 1727–1743 (2017). https://doi.org/10.1007/s11661-016-3952-2

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