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Segregation of B, P, and C in the Ni-Based Superalloy, Inconel 718

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Abstract

Small additions of B, P, and C can result in dramatic changes in the mechanical performance and welding behavior of Inconel 718. Although additions of B and P improve the mechanical properties, they have a detrimental effect on weldability. Adding C mitigates the negative effect on welding while retaining the improvements in mechanical performance. In this study, precise observations of the segregation of B, P, and C to the grain boundaries are made using site-specific atom probe tomography and NanoSIMS. Changes in the segregation behavior provide a quantitative explanation for the welding response, where hot cracking is attributed to the formation of a eutectic film. Calculations of the relative positions of the B, P, and C revealed that these atoms were less likely to cluster together in the presence of C, providing insight into the likely mechanisms behind the segregation behavior in this complex, multicomponent alloy.

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Acknowledgments

This work was funded by the Australian Research Council. The authors are grateful for the scientific and technical input of the Australian Microscopy and Microanalysis Research Facility (AMMRF) nodes at the University of Sydney and the University of Western Australia and support from the AMMRF travel and access program.

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Authors and Affiliations

  1. Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, NSW, 2006, Australia

    Talukder Alam (Ph.D. Student), Peter J. Felfer (Ph.D. Student), Leigh T. Stephenson (Research Associate) & Julie M. Cairney (Associate Professor)

  2. Department of Mechanical and Industrial Engineering, The University of Manitoba, Winnipeg, MB, R3T 5V6, Canada

    Mahesh Chaturvedi (Professor)

  3. Centre for Microscopy, Characterisation and Analysis (CMCA), The University of Western Australia, Crawley, WA, 6009, Australia

    Matthew R. Kilburn (Associate Professor)

Authors
  1. Talukder Alam
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  2. Peter J. Felfer
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  3. Mahesh Chaturvedi
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  4. Leigh T. Stephenson
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  5. Matthew R. Kilburn
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  6. Julie M. Cairney
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Corresponding author

Correspondence to Julie M. Cairney.

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Manuscript submitted May 15, 2011.

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Alam, T., Felfer, P.J., Chaturvedi, M. et al. Segregation of B, P, and C in the Ni-Based Superalloy, Inconel 718. Metall Mater Trans A 43, 2183–2191 (2012). https://doi.org/10.1007/s11661-012-1085-9

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  • DOI: https://doi.org/10.1007/s11661-012-1085-9

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