Stability of a model Fe-14Cr nanostructured ferritic alloy after long-term thermal creep

Journal Article · 10 June 2019 · Scripta Materialia

DOI: https://doi.org/10.1016/j.scriptamat.2019.06.001 · OSTI ID:1543208

Massey, Caleb P. ^[1]; Hoelzer, David T.  ^[2]; Edmondson, Philip D.  ^[2]; Kini, Anoop ^[3]; Gault, Baptiste ^[3]; Terrani, Kurt A.  ^[2]; Zinkle, Steven J. ^[1]

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1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
3. Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf (Germany)

The successful development of advanced materials such as nanostructured ferritic alloys (NFA) for next generation nuclear reactor concepts and ultra-supercritical steam power plants requires information on long term thermal creep. To support this initiative, we examine the NFA MA957 (Fe-14Cr-1.0Ti-0.3Mo + 0.3Y₂O₃ in wt%) crept to 61,251 h at 825 °C and 70 MPa, the longest creep test available to date for this material. Using atom probe tomography and electron microscopy, it is demonstrated that the grain size and nanoprecipitate size/composition are unaffected following this 7 yr creep test, although significant porosity is noted throughout the microstructure attributed to microvoid coalescence and growth.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1543208
• Journal Information: Scripta Materialia, Vol. 170, Issue C; ISSN 1359-6462
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English