Abstract
The present study investigates the isothermal oxidation behaviour of Sanicro 25 (42Fe22Cr25NiWCuNbN) in dry and wet environments at 600–750 °C. GDOES, SEM, TEM and EDX were used as analytical techniques. The alloy formed a protective oxide when exposed in dry O2 (600–750 °C). When water vapour was present, the oxide exhibited protective behaviour only at 600 °C with breakaway occurring at 700 and 750 °C. Apparently, the chromium supply from the bulk was not able to counteract the increasing rate of chromium evaporation favoured by water vapour in the latter conditions and thus breakaway oxidation occurs.
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