Observation of oscillatory radiation induced segregation profiles at grain boundaries in neutron irradiated 316 stainless steel using atom probe tomography
Barr CM, Felfer P, Cole JI, Taheri ML (2018)
Publication Status: Published
Publication Type: Journal article
Publication year: 2018
Journal
Publisher: ELSEVIER SCIENCE BV
Book Volume: 504
Pages Range: 181-190
DOI: 10.1016/j.jnucmat.2018.01.053
Abstract
Radiation induced segregation in austenitic Fe-Ni-Cr stainless steels is a key detrimental microstructural modification experienced in the current generation of light water reactors. In particular, Cr depletion at grain boundaries can be a significant factor in irradiation-assisted stress corrosion cracking. Therefore, having a complete knowledge and mechanistic understanding of radiation induced segregation at high dose and after a long thermal history is desired for continued sustainability of existing reactors. Here, we examine a 12% cold worked AISI 316 stainless steel hexagonal duct exposed in the lower dose, outer blanket region of the EBR-II reactor, by using advanced characterization and analysis techniques including atom probe tomography and analytical scanning transmission electron microscopy. Contrary to existing literature, we observe an oscillatory w-shape Cr and M-shape Ni concentration profile at 31 dpa. The presence and characterization through advanced atom probe tomography analysis of the w-shape Cr RIS profile is discussed in the context of the localized GB plane interfacial excess of the other major and minor alloying elements. The key finding of a co-segregation phenomena coupling Cr, Mo, and C is discussed in the context of the existing solute segregation literature under irradiation with emphasis on improved spatial and chemical resolution of atom probe tomography. (C) 2018 Elsevier B.V. All rights reserved.
Authors with CRIS profile
Additional Organisation(s)
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Professur für Atom Probe Tomography
Involved external institutions
United States (USA) (US)How to cite
APA:
Barr, C.M., Felfer, P., Cole, J.I., & Taheri, M.L. (2018). Observation of oscillatory radiation induced segregation profiles at grain boundaries in neutron irradiated 316 stainless steel using atom probe tomography. Journal of Nuclear Materials, 504, 181-190. https://dx.doi.org/10.1016/j.jnucmat.2018.01.053
MLA:
Barr, Christopher M., et al. "Observation of oscillatory radiation induced segregation profiles at grain boundaries in neutron irradiated 316 stainless steel using atom probe tomography." Journal of Nuclear Materials 504 (2018): 181-190.
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