Morphology and elemental composition of a new iron-rich ferrite phase in highly irradiated austenitic steel

Merezhko, D. A.; Gussev, Maxim N.; Merezhko, M. S.; Rofman, O. V.; Rosseel, T. M.; Garner, Francis A.

doi:10.1016/j.scriptamat.2022.114690

Title: Morphology and elemental composition of a new iron-rich ferrite phase in highly irradiated austenitic steel

Journal Article · 01 April 2022 · Scripta Materialia

DOI: https://doi.org/10.1016/j.scriptamat.2022.114690 · OSTI ID:1890331

Merezhko, D. A. ^[1];

^[2]; Merezhko, M. S. ^[1]; Rofman, O. V. ^[1];

^[2]; Garner, Francis A. ^[3]

Institute of Nuclear Physics, Almaty (Kazakhstan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Radiation Effects Consulting, Richland, WA (United States); Texas A & M Univ., College Station, TX (United States)

Here, elemental composition and morphology of a previously unidentified radiation-induced ferrite phase were investigated in a 300-series steel irradiated by neutrons in-service up to 57.6 dpa. Specimens of 18Cr-10Ni-Ti stainless steel (AISI 321 analog) were cut from a hexagonal wrapper of a fuel assembly irradiated in the BN-350 sodium-cooled fast reactor. An Fe-rich bcc-phase was observed primarily on grain boundaries. In this phase, the concentration of Cr is ~8–12% (compared to ~19% in the matrix), the concentration of Ni is ~1.5–3% (~9% in the bulk material), and the concentration of Mn is ~0.23% (1.3% in the matrix). This Fe-rich phase is distinctly different from the retained-ferrite phase, commonly found in commercial austenitic steels. The extensive appearance of this Fe-rich ferrite on grain boundaries suggests that enhanced surface–intergranular corrosion may occur in water-cooled power reactors, arising from the low Ni, Mn, and Cr concentrations in this phase.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); Ministry of Education and Science of the Republic of Kazakhstan

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1890331

Alternate ID(s):: OSTI ID: 1861462

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 7 Vol. 215; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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