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

Baik, Sung-Il; Rawlings, Michael J.S.; Dunand, David C.

doi:10.1016/j.actamat.2017.11.013

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

Journal Article · Mon Nov 13 00:00:00 EST 2017 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2017.11.013· OSTI ID:1537899

^[1]; Rawlings, Michael J.S. ^[1]; Dunand, David C. ^[1]

Northwestern University, Evanston, IL (United States)

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.

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Research Organization:: Univ. of Tennessee, Knoxville, TN (United States); Northwestern Univ., Evanston, IL (United States)

Sponsoring Organization:: 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)

Grant/Contract Number:: FE0005868; DMR-0420532; N00014–0400798; N00014–0610539; N00014–0910781; N00014-1712870; DMR-1720139; ECCS-1542205

OSTI ID:: 1537899

Alternate ID(s):: OSTI ID: 1549093

Journal Information:: Acta Materialia, Vol. 144, Issue C; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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

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