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The Effect of Secondary Gamma-Prime on the Primary Creep Behavior of Single-Crystal Nickel-Base Superalloys

  • Symposium: Neutron and X-Ray Studies of Advanced Materials
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Abstract

Some second-, third-, and fourth-generation single-crystal Ni-base superalloys (i.e., Re-containing alloys) have demonstrated the propensity for excessive primary creep at intermediate temperatures. This behavior has been attributed to the presence of secondary gamma-prime precipitates in the gamma channels as well as on the Re content of the alloys. This investigation examined creep behavior for a common first-generation alloy, PWA 1480, a common second-generation alloy, PWA 1484, as well as a modified first-generation alloy, PWA 1480, with 3 wt pct rhenium added. In addition, two different aging heat treatments were given to each alloy to either precipitate or prevent the formation of fine (nanometer-scale) secondary gamma-prime in the gamma channels. The intermediate creep properties and tensile properties of the alloys were determined for both conditions. The microstructures of these samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD), and then the role of the fine-scale microstructure and the alloy composition on the primary creep deformation was determined.

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Acknowledgments

The authors acknowledge the MAIC at the University of Florida and the AMPAC at the University of Central Florida for their help in the characterization and analysis of these alloys. The authors also thank Samuel Krotzer, Alan Cetel, and Dilip Shah, Pratt & Whitney Aircraft Engines, for supplying the materials used in this investigation. This article is based upon work supported by the United States National Science Foundation under Grants Nos. 0072671 and 0353952.

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Authors and Affiliations

  1. Materials Science and Engineering Department, University of Florida, Gainesville, FL, 32611, USA

    B.C. Wilson (Graduate Student) & G.E. Fuchs (Associate Professor)

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  1. B.C. Wilson
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  2. G.E. Fuchs
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Correspondence to G.E. Fuchs.

Additional information

This article is based on a presentation given in the symposium “Neutron and X-Ray Studies of Advanced Materials,” which occurred February 15–19, 2009, during the TMS Annual Meeting in San Francisco, CA, under the auspices of TMS, TMS Structural Materials Division, TMS/ASM Mechanical Behavior of Materials Committee, TMS: Advanced Characterization, Testing, and Simulation Committee, and TMS: Titanium Committee.

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Wilson, B., Fuchs, G. The Effect of Secondary Gamma-Prime on the Primary Creep Behavior of Single-Crystal Nickel-Base Superalloys. Metall Mater Trans A 41, 1235–1245 (2010). https://doi.org/10.1007/s11661-009-9979-x

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