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

Harri Ali-Löytty, Markku Hannula, Timo Juuti, Yuran Niu, Alexei A. Zakharov, Mika Valden

    Research output: Contribution to journalArticleScientificpeer-review

    23 Citations (Scopus)
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    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 suppressed.
    Original languageEnglish
    Pages (from-to)214-222
    JournalCorrosion Science
    Volume132
    DOIs
    Publication statusPublished - Mar 2018
    Publication typeA1 Journal article-refereed

    Publication forum classification

    • Publication forum level 3

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