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

SCRIPTA MATERIALIA

卷:170

Article

Massey, Caleb P.^1,2  Hoelzer, David T.²  Edmondson, Philip D.²  Kini, Anoop³  Gault, Baptiste³  Terrani, Kurt A.²  Zinkle, Steven J.^1,2 

[1] Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[3] Max Planck Inst Eisenforsch GmbH, Dusseldorf, Germany

关键词: Atom probe tomography;    Oxide dispersion strengthened (ODS) alloy;    Precipitation;    Creep;   

DOI  :  10.1016/j.scriptamat.2019.06.001

来源: Elsevier

【 摘 要 】

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 + 03Y(2)O(3) in wt %) crept to 61,251 hat 825 degrees 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. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free