Ex-situ and in-situ investigations of thermal anti-oxidation treatments of stainless steels by reflection mode EXAFS

16th International Conference on X-ray Absorption Fine Structure

Lützenkirchen-Hecht, D.^1 ; Wulff, D.^2 ; Wagner, R.^1 ; Holländer, U.^2 ; Maier, H.J.^2 ; Frahm, R.^1

Bergische Universität Wuppertal, Gaußstr. 20, Wuppertal

42097, Germany^1

Leibniz Universität Hannover, Institut für Werkstoffkunde, An der Universität 2, Garbsen

30823, Germany^2

关键词: Anti-oxidation;    Conveyor belts;    High-vacuum environments;    In-situ investigations;    Inert carrier gas;    Metallic state;    Reflection modes;    Steel surface;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012047/pdf
DOI  :  10.1088/1742-6596/712/1/012047

来源: IOP

【 摘 要 】

Different thermal treatments were performed for the anti-oxidation of steel surfaces, and the processes were investigated ex-situ and in-situ by surface sensitive reflection mode EXAFS experiments at the Cr and Fe K-edges. While the samples for the ex-situ studies were heat-treated in a conveyor belt furnace at temperatures between 600 and 900 °C in inert carrier gases (N2or Ar) using different additives such as hydrogen (H2) and monosilane (SiH4), the in- situ anti-oxidation treatments have been performed in a high vacuum environment (p -6mbar). While the ex-situ experiments suggest that SiH4-additives are needed for the reduction of the steel to a metallic state, the in-vacuum treatments appear successful for temperatures above approx. 900 °C.