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

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Grain orientation dependent Nb-Ti microalloying mediated surface segregation on ferritic stainless steel. / Ali-Löytty, Harri; Hannula, Markku ; Honkanen, Mari; Östman, Kauko; Lahtonen, Kimmo ; Valden, Mika.

In: Corrosion Science, Vol. 112, 11.2016, p. 204-213.

Research output: Contribution to journal › Article › Scientific › peer-review

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@article{c6cb76608bb540b1a0596276c4080a03,

title = "Grain orientation dependent Nb-Ti microalloying mediated surface segregation on ferritic stainless steel",

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",

author = "Harri Ali-L{\"o}ytty and Markku Hannula and Mari Honkanen and Kauko {\"O}stman and Kimmo Lahtonen and Mika Valden",

year = "2016",

month = "11",

doi = "10.1016/j.corsci.2016.07.024",

language = "English",

volume = "112",

pages = "204--213",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier",

}

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TY - JOUR

T1 - Grain orientation dependent Nb-Ti microalloying mediated surface segregation on ferritic stainless steel

AU - Ali-Löytty, Harri

AU - Hannula, Markku

AU - Honkanen, Mari

AU - Östman, Kauko

AU - Lahtonen, Kimmo

AU - Valden, Mika

PY - 2016/11

Y1 - 2016/11

N2 - 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.

AB - 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.

KW - A. Stainless steel

KW - B. SEM

KW - B. XPS

KW - C. Interfaces

KW - C. Oxidation

KW - C. Segregation

U2 - 10.1016/j.corsci.2016.07.024

DO - 10.1016/j.corsci.2016.07.024

M3 - Article

VL - 112

SP - 204

EP - 213

JO - Corrosion Science

JF - Corrosion Science

SN - 0010-938X

ER -

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