Journal
CORROSION SCIENCE
Volume 112, Issue -, Pages 204-213Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2016.07.024
Keywords
Stainless steel; XPS; SEM; Interfaces; Segregation; Oxidation
Funding
- Academy of Finland [141481, 286713]
- Academy of Finland (AKA) [286713, 286713, 141481, 141481] Funding Source: Academy of Finland (AKA)
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Surface segregation and oxide formation anisotropy on Ti-Nb stabilized ferritic stainless steel (EN 1,4521) were studied by XPS and Electron Backscatter Diffraction. Competitive surface segregation of Si, Nb and Ti was initiated at similar to 550 degrees C, and segregation was favored to the open surface sites of (111) oriented grains. Furthermore, the surface segregation of Cr was strongly limited at the locations of stable Ti(CN)- and (NbTi)C-type precipitates. Consequently, the oxidation resistance of stainless steels can be enhanced cost efficiently, without alloy additions, by optimizing the microstructure to facilitate the fast and uniform growth of protective oxide scale. (C) 2016 Elsevier Ltd. All rights reserved.
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