Abstract
The oxide evolution of 9Cr3W3Co martensitic steel in the supercritical water environment at 650 °C and 30 MPa was studied. The results indicated that a double-layer oxide film, composed of a columnar Fe3O4 outer layer and a fine grain FeCr2O4/Fe3O4 spinel mixed inner one, that thicknesses followed a sub-parabolic law, was formed. The FeCr2O4 first grew along various boundaries, then grew into lath along subgrain boundary, dislocation line or by bulk diffusion. After a continuous Cr-rich oxide layer was formed at the inner oxide layer/matrix interface, the inner layer was gradually completely oxidized, which significantly slowed down the oxide rate.
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