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The role of (FeCrSi)2(MoNb)-type Laves phase on the formation of Mn-rich protective oxide scale on ferritic stainless steel

Ali-Löytty, Harri; Hannula, Markku; Juuti, Timo; Niu, Yuran LU ; Zakharov, Alexei A. LU and Valden, Mika (2017) In Corrosion Science
Abstract

Microalloying of stainless steel with reactive elements increases oxidation resistance but makes the alloy prone to microstructural changes. XPS results reveal changes in the initial oxidation mechanism on Ti-Nb stabilized ferritic stainless steel (EN 1.4521) after 120 h heat treatment at 650 °C. Age-precipitation of (FeCrSi)2(MoNb)-type Laves phase resulted in less pronounced surface segregation and oxidation of microalloying elements. Si oxidizes preferentially at the Laves precipitate locations via outward diffusion forming diffusion barrier for the other scale forming elements. Most significantly the diffusion of Mn and the formation of low volatile (Mn,Cr)3O4 spinel oxide at the surface was strongly... (More)

Microalloying of stainless steel with reactive elements increases oxidation resistance but makes the alloy prone to microstructural changes. XPS results reveal changes in the initial oxidation mechanism on Ti-Nb stabilized ferritic stainless steel (EN 1.4521) after 120 h heat treatment at 650 °C. Age-precipitation of (FeCrSi)2(MoNb)-type Laves phase resulted in less pronounced surface segregation and oxidation of microalloying elements. Si oxidizes preferentially at the Laves precipitate locations via outward diffusion forming diffusion barrier for the other scale forming elements. Most significantly the diffusion of Mn and the formation of low volatile (Mn,Cr)3O4 spinel oxide at the surface was strongly suppressed.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
A. Stainless steel, B. XPS, C. Interfaces, C. Oxidation, C. Segregation
in
Corrosion Science
publisher
Elsevier Limited
external identifiers
  • scopus:85039953400
ISSN
0010-938X
DOI
10.1016/j.corsci.2017.12.026
language
English
LU publication?
yes
id
ab6b2240-760e-437e-86fd-384d852f495a
date added to LUP
2018-01-11 07:44:57
date last changed
2018-01-14 04:38:09
@article{ab6b2240-760e-437e-86fd-384d852f495a,
  abstract     = {<p>Microalloying of stainless steel with reactive elements increases oxidation resistance but makes the alloy prone to microstructural changes. XPS results reveal changes in the initial oxidation mechanism on Ti-Nb stabilized ferritic stainless steel (EN 1.4521) after 120 h heat treatment at 650 °C. Age-precipitation of (FeCrSi)<sub>2</sub>(MoNb)-type Laves phase resulted in less pronounced surface segregation and oxidation of microalloying elements. Si oxidizes preferentially at the Laves precipitate locations via outward diffusion forming diffusion barrier for the other scale forming elements. Most significantly the diffusion of Mn and the formation of low volatile (Mn,Cr)<sub>3</sub>O<sub>4</sub> spinel oxide at the surface was strongly suppressed.</p>},
  author       = {Ali-Löytty, Harri and Hannula, Markku and Juuti, Timo and Niu, Yuran and Zakharov, Alexei A. and Valden, Mika},
  issn         = {0010-938X},
  keyword      = {A. Stainless steel,B. XPS,C. Interfaces,C. Oxidation,C. Segregation},
  language     = {eng},
  month        = {12},
  publisher    = {Elsevier Limited},
  series       = {Corrosion Science},
  title        = {The role of (FeCrSi)<sub>2</sub>(MoNb)-type Laves phase on the formation of Mn-rich protective oxide scale on ferritic stainless steel},
  url          = {http://dx.doi.org/10.1016/j.corsci.2017.12.026},
  year         = {2017},
}