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Low-Temperature Carburization of the Ni-base Superalloy IN718: Improvements in Surface Hardness and Crevice Corrosion Resistance

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Abstract

“Case-hardening” of the Ni-base superalloy IN718 has been achieved by low-temperature gas-phase carburization. After carburization under optimum conditions, the hardened surface layer (the “case”) has about twice the hardness of the core (HV of ≈800) and contains ≈12 at pct carbon in interstitial solid solution. This causes a lattice parameter expansion of ≈1 pct perpendicular to the surface and, because of the mechanical constraint provided by the noncarburized core below, develops a large biaxial surface compressive residual stress (≈1.9 GPa) parallel to the surface. Microstructural studies and X-ray diffractometry reveal no carbide precipitates in the case. In agreement with this observation, low-temperature carburization does not compromise the ductility and actually improves the crevice corrosion resistance of the alloy.

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Acknowledgments

The authors gratefully acknowledge the support of Leo Christodoulou, DARPA. We thank Sunniva Collins, Steven Marx, and Peter Williams for constructive discussions and the Swagelok Company for carburization of the specimens and for hardness measurements. This research was supported financially by DARPA and the Naval Research Laboratory.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA

    Reza Sharghi-Moshtaghin (Senior Research Associate), Harold Kahn (Research Associate Professor), Yindong Ge (Research Assistant), Xiaoting Gu (Research Assistant), Gary M. Michal (Professor), Frank Ernst (Professor) & Arthur H. Heuer (Professor)

  2. Chemistry Division, Naval Research Laboratory, Washington, DC, 20375, USA

    Farrel J. Martin (Research Metallurgist), Paul M. Natishan (Research Metallurgist) & Roy J. Rayne (Materials Engineer)

Authors
  1. Reza Sharghi-Moshtaghin
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  2. Harold Kahn
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  3. Yindong Ge
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  4. Xiaoting Gu
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  5. Farrel J. Martin
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  6. Paul M. Natishan
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  8. Gary M. Michal
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  9. Frank Ernst
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  10. Arthur H. Heuer
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Corresponding author

Correspondence to Arthur H. Heuer.

Additional information

Manuscript submitted June 25, 2009.

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Sharghi-Moshtaghin, R., Kahn, H., Ge, Y. et al. Low-Temperature Carburization of the Ni-base Superalloy IN718: Improvements in Surface Hardness and Crevice Corrosion Resistance. Metall Mater Trans A 41, 2022–2032 (2010). https://doi.org/10.1007/s11661-010-0299-y

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  • DOI: https://doi.org/10.1007/s11661-010-0299-y

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