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Microstructural and morphological observations of the surface scale on a high Cr and Ni austenitic heat resistant steel oxidised in water vapour at 700 °C are reported. Analysis of microstructure was carried out by analytical techniques of transmission- and scanning electron microscopy. Investigation of M 23 C 6 nucleated at the interface between matrix and the Z-phase precipitates after exposing to high temperature showed semicoherency between M 23 C 6 and the matrix and no coherency with the Z-phase. Plates developed on the oxide scale surface consist of Cr 2 O 3 crystals separated by amorphous SiO 2 .

Microstructural Characterisation of Austenitic Heat Resistant Sanicro 25 Steel after Steam Oxidation