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Title: Atom probe tomography study of Fe-Ni-Al-Cr-Ti ferritic steels with hierarchically-structured precipitates

Abstract

The ferritic Fe-Ni-Al-Cr-Mo steel (FBB8) has good creep properties up to 700 °C due to B2-NiAl nanoscale precipitates and its creep resistance can be further improved by additions of 2 or 4 wt.% Ti, as a result of sub-precipitates within the main precipitates. We report the hierarchical structure of the precipitates is studied in the light of phase separation via transmission electron microscopy (TEM) and atom probe tomography (APT). For FBB8-2Ti (with 2% Ti added) exhibiting B2-NiAl precipitates with L21-Ni2AlTi sub-precipitates, APT analysis shows strong partitioning of Ni, Al and Ti from the ferritic matrix into the B2/L21 precipitates and, within the precipitates, partitioning of Ti and Fe within the L21 sub-precipitates. Based on the published pseudo-binary phase-diagram between (Ni,Fe)Al and (Ni,Fe)Ti, this hierarchical precipitate microstructure is discussed based on the known miscibility gap between the B2 and L21 phases, due to partitioning of Ti into the L21 phase and ordering of Al and Ti on the Al sub-lattice of the B2 structure. For FBB8-4Ti (with 4% Ti added), by contrast, the L21 precipitates exhibit bcc sub-precipitates rich in Fe and Cr, with a composition close to that of the matrix; the absence of the B2 structure is consistent withmore » an increase of Ti and Fe concentrations, to 18.2 and 19.3 at.% respectively, as measured via APT, in the L21 precipitates.« less

Authors:
ORCiD logo [1];  [1];  [1]
  1. Northwestern University, Evanston, IL (United States)
Publication Date:
Research Org.:
Univ. of Tennessee, Knoxville, TN (United States); Northwestern Univ., Evanston, IL (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE); National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Fossil Energy and Carbon Management (FECM)
OSTI Identifier:
1537899
Alternate Identifier(s):
OSTI ID: 1549093
Grant/Contract Number:  
FE0005868; DMR-0420532; N00014–0400798; N00014–0610539; N00014–0910781; N00014-1712870; DMR-1720139; ECCS-1542205
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 144; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ferritic steel; precipitate strengthening; hierarchical precipitate structure; B2-L21 phase separation; transmission electron microscopy; TEM; atom-probe tomography; APT

Citation Formats

Baik, Sung-Il, Rawlings, Michael J.S., and Dunand, David C. Atom probe tomography study of Fe-Ni-Al-Cr-Ti ferritic steels with hierarchically-structured precipitates. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.11.013.
Baik, Sung-Il, Rawlings, Michael J.S., & Dunand, David C. Atom probe tomography study of Fe-Ni-Al-Cr-Ti ferritic steels with hierarchically-structured precipitates. United States. https://doi.org/10.1016/j.actamat.2017.11.013
Baik, Sung-Il, Rawlings, Michael J.S., and Dunand, David C. Mon . "Atom probe tomography study of Fe-Ni-Al-Cr-Ti ferritic steels with hierarchically-structured precipitates". United States. https://doi.org/10.1016/j.actamat.2017.11.013. https://www.osti.gov/servlets/purl/1537899.
@article{osti_1537899,
title = {Atom probe tomography study of Fe-Ni-Al-Cr-Ti ferritic steels with hierarchically-structured precipitates},
author = {Baik, Sung-Il and Rawlings, Michael J.S. and Dunand, David C.},
abstractNote = {The ferritic Fe-Ni-Al-Cr-Mo steel (FBB8) has good creep properties up to 700 °C due to B2-NiAl nanoscale precipitates and its creep resistance can be further improved by additions of 2 or 4 wt.% Ti, as a result of sub-precipitates within the main precipitates. We report the hierarchical structure of the precipitates is studied in the light of phase separation via transmission electron microscopy (TEM) and atom probe tomography (APT). For FBB8-2Ti (with 2% Ti added) exhibiting B2-NiAl precipitates with L21-Ni2AlTi sub-precipitates, APT analysis shows strong partitioning of Ni, Al and Ti from the ferritic matrix into the B2/L21 precipitates and, within the precipitates, partitioning of Ti and Fe within the L21 sub-precipitates. Based on the published pseudo-binary phase-diagram between (Ni,Fe)Al and (Ni,Fe)Ti, this hierarchical precipitate microstructure is discussed based on the known miscibility gap between the B2 and L21 phases, due to partitioning of Ti into the L21 phase and ordering of Al and Ti on the Al sub-lattice of the B2 structure. For FBB8-4Ti (with 4% Ti added), by contrast, the L21 precipitates exhibit bcc sub-precipitates rich in Fe and Cr, with a composition close to that of the matrix; the absence of the B2 structure is consistent with an increase of Ti and Fe concentrations, to 18.2 and 19.3 at.% respectively, as measured via APT, in the L21 precipitates.},
doi = {10.1016/j.actamat.2017.11.013},
journal = {Acta Materialia},
number = C,
volume = 144,
place = {United States},
year = {2017},
month = {11}
}

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Cited by: 24 works
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