Journal
JOM
Volume 66, Issue 12, Pages 2535-2542Publisher
SPRINGER
DOI: 10.1007/s11837-014-1208-4
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Funding
- U.S. Department of Energy (DOE), Office of Fossil Energy
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The Ni-based alloy, Inconel (R) 740, is being extensively examined for use in advanced ultrasupercritical steam boilers because its precipitation-strengthened microstructure appears to offer the necessary creep strength under the high temperatures and pressures (up to 760 degrees C and 35 MPa) needed for high efficiency power generation. However, because this application requires extremely long lifetimes under these conditions (up to 30 years), long-term microstructure stability is a major concern. In this paper, results from microstructural analyses of Inconel 740 specimens aged at 700 and 750 degrees C in the presence and absence of creep loading for times up to similar to 31,000 h are presented. The primary focus was on the development of the eta eta (Ni3Ti) phase and coarsening of coherent gamma'-Ni-3(Al,Ti) precipitates and its depletion near eta/matrix interfaces. However, despite these processes, Inconel 740 showed adequate long-term microstructural stability to assure adequate creep strength for the intended application.
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