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Grain orientation dependent Nb-Ti microalloying mediated surface segregation on ferritic stainless steel

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Details

Original languageEnglish
Pages (from-to)204-213
JournalCorrosion Science
Volume112
DOIs
Publication statusPublished - Nov 2016
Publication typeA1 Journal article-refereed

Abstract

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 ∼550. °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.

Keywords

  • A. Stainless steel, B. SEM, B. XPS, C. Interfaces, C. Oxidation, C. Segregation

Publication forum classification

Field of science, Statistics Finland