Abstract
The combined erosion-corrosion behavior of 9Cr-1Mo steel (where the composition is in approximate weight per cent) was determined at 850°C using a stream of air and Al 2O 3 particles, 130 μm in diameter, from a nozzle at velocities from 10 to 70 m s −1 at two impact angles, α = 30° and α = 90°. The mechanism of surface degradation and the rates of sound metal loss were determined. Corrosion was the dominant mechanism at all the velocities tested. It was determined that at α = 90° there was a change in the scale loss mechanism at about 30 m s −1 from cracking and chipping to periodic spalling. The spalling increased the sound metal loss rates at the higher velocities. At an impact angle α = 30° the erosion mechanism and rates and the resulting scale morphologies were considerably different from those which occurred at α = 90°.
Published Version
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