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Author: search.filters.author.Parry, Valérie

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    Morpho-chemical investigations and thermodynamic study of Nb-rich passive nodules grown on AISI 441 oxidized in wet atmosphere
    (2018-08-15)
    Parry, Valérie
    ;
    Wongpromrat, Wichitra
    ;
    Latu-Romain, Laurence
    ;
    Pascal, Céline
    ;
    Chandra-ambhorn, Walairat
    AISI 441 sheets were oxidized from 4 to 24 h at 800 °C in wet atmosphere. Micrometric oxide nodules containing Ti, Nb, Cr and Mn were observed to form on the passive scale. The internal microstructure of these objects was investigated using STEM–EDX and FIB-SEM tomography. Experimental results reveal a complex microstructure linked with the presence of Si and Nb and their competition for interfacial oxidation. Eventually, the chemical compositions of the nodule and of the oxidation affected zone in the nodule vicinity are discussed in relation with thermodynamic calculations investigating the stability of the different oxides.
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    Advanced microstructural investigations of AISI 441 early stage oxidation in wet atmosphere
    (2017-01-01)
    Wongpromrat, Wichitra
    ;
    Parry, Valérie
    ;
    Chandra-Ambhorn, Walairat
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    Chandra-Ambhorn, Somrerk
    ;
    Galerie, Alain
    AISI 441 ferritic stainless steel is a good candidate for metallic interconnects in solid oxide fuel cells (SOFCs). The minor elements Ti and Nb are used to stabilize the ferritic matrix and also to reduce creep by a combination of solid solution strengthening and precipitation of intermetallic Laves phase particles along the grain boundaries. However their influence on the oxidation behavior is not well understood. This study focuses on the early stages oxidation (from 4 to 24 h) at 800°C of AISI 441 under 5% H<inf>2</inf>O in O<inf>2</inf>. A relatively smooth micro-crystallized oxide scale and Ti, Nb containing nodules are observed. The internal microstructure of these objects is studied by FIB tomography which allows computing cross sectional views in any direction of interest. FIB study reveals a complex microstructure and a development strongly linked to the presence of niobium and/or titanium in the substrate.
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    Reduction of chromium volatilisation from stainless steel interconnector of solid oxide electrochemical devices by controlled preoxidation
    (2016-05-01)
    Wongpromrat, Wichitra
    ;
    Berthomé, Grégory
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    Parry, Valérie
    ;
    Chandra-ambhorn, Somrerk
    ;
    Chandra-ambhorn, Walairat