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

Caleb P. Massey; David T. Hoelzer; Philip D. Edmondson; Anoop Kini; Baptiste Gault; Kurt A. Terrani; Steven J. Zinkle

doi:10.1016/j.scriptamat.2019.06.001

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

Caleb P. Massey, David T. Hoelzer, Philip D. Edmondson, Anoop Kini, Baptiste Gault, Kurt A. Terrani, Steven J. Zinkle

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

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, this work examines 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 shown 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.

Original language	English
Pages (from-to)	134-139
Number of pages	6
Journal	Scripta Materialia
Volume	170
DOIs	https://doi.org/10.1016/j.scriptamat.2019.06.001
State	Published - Sep 2019

Funding

This research was sponsored by the U.S. Department of Energy , Office of Nuclear Energy, through the Nuclear Technology Research and Development Program. This manuscript has been authored by Oak Ridge National Laboratory, managed by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. This research was conducted, in part, using instrumentation within ORNL's Materials Characterization Core provided by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The authors would also like to acknowledge Dr. Jonathan Poplawsky at the Center for Nanophase Materials Sciences at Oak Ridge National Laboratory for his help in finding the archived LEAP data for comparison.

Keywords

Atom probe tomography
Creep
Oxide dispersion strengthened (ODS) alloy
Precipitation

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10.1016/j.scriptamat.2019.06.001

Cite this

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abstract = "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, this work examines 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 shown 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.",

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AU - Gault, Baptiste

AU - Terrani, Kurt A.

AU - Zinkle, Steven J.

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

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Keywords

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