High‐Temperature Initial Oxidation Behavior in LDX 2101.

High‐temperature initial oxidation behavior at 1000 °C in LDX 2101 oxidized in a closed element is studied. The samples are investigated using optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, glow discharge optical emission spectroscopy, and Raman spectra. Results show differences in morphology and development of oxides on the two phases. In the initial stage, the oxide on austenite is granular, whereas that on the ferrite region is homogeneous. However, the entire surface is full of chromium oxide. In the austenite phase, oxide gradually changes from Fe₂O₃ to Cr₂O₃. By contrast, oxide transforms from Mn₂O₃ to Fe₂O₃ and then to Cr₂O₃ in the ferrite phase. In addition, manganese enrichment is observed in the entire oxidation process. [ABSTRACT FROM AUTHOR]