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Precipitate Evolution and Creep Behavior of a W-Free Co-based Superalloy

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Abstract

The morphological and temporal evolution of \(\gamma ^{\prime }\) (L1\(_2\))-precipitates is studied in a polycrystalline Co-based superalloy (Co-30Ni-9.9Al-5.1Mo-1.9Nb at. pct) free of tungsten, aged at 1173 K (900 °C). Over a \(1000\,{{\rm{hours}}}\) heat-treatment, the \(\gamma ^{\prime }\) morphology evolves due to precipitate coalescence. The particles grow in size and the volume fraction decreases, while there is no significant change in the microhardness value. Compressional creep tests at 1123 K (850 °C) on a specimen aged at 1173 K (900 °C) demonstrate that the creep resistance is comparable to the original, W-containing, higher-density Co-based superalloy (Co-9Al-9.8W at. pct). This represents the first creep study of the Co-Al-Mo-Nb-based superalloy system. The W-free alloy exhibits directional coarsening of the \(\gamma ^{\prime }\) precipitates in the direction perpendicular to the applied compressive stress, which indicates a positive misfit. This is consistent with neutron diffraction results.

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Acknowledgments

This work was performed under the following financial assistance award 70NANB14H012 from U.S. Department of Commerce, National Institute of Standards and Technology as part of the Center for Hierarchical Materials Design (ChiMad). JC acknowledges support from the European Union Seventh Framework Programme under the Marie Curie grant Agreement No. 628643. The neutron scattering study at the SNS was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy, at Oak Ridge National Laboratory under contract DE-AC05-00OR22725 with UT-Battelle. This work made use of the EPIC facility of the NUANCE Center at Northwestern University, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF NNCI-1542205); the MRSEC program (NSF DMR-1121262) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208-3108, USA

    Qinyuan Liu (PhD Student), James Coakley (Research Fellow), David N. Seidman (Professor) & David C. Dunand (Professor)

  2. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK

    James Coakley (Research Fellow)

  3. Northwestern University Center for Atom-Probe Tomography (NUCAPT), 2220 Campus Drive, Evanston, IL, 60208, USA

    David N. Seidman (Professor)

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  1. Qinyuan Liu
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  2. James Coakley
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  3. David N. Seidman
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Correspondence to James Coakley.

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Manuscript submitted April 20, 2016.

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Liu, Q., Coakley, J., Seidman, D.N. et al. Precipitate Evolution and Creep Behavior of a W-Free Co-based Superalloy. Metall Mater Trans A 47, 6090–6096 (2016). https://doi.org/10.1007/s11661-016-3775-1

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  • DOI: https://doi.org/10.1007/s11661-016-3775-1

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