Abstract
A laboratory apparatus has been designed to allow investigation of erosion oxidation by particles at concentrations of 40 vol.% and speeds of 0.5–10 m s −1 in air temperatures up to 700°C. The alloy specimens are rotated through a fluidized bed of particles held at the temperature of interest to attain the necessary parameters. This paper considers the effects of temperature on the erosion oxidation of mild steel, 2.25Cr1Mo steel, Fe12Cr and 310 stainless steel. It is shown how particle size and speed of impact influence the relationship between damage and temperature. At an impact speed of 5 m s −1, the erosion by coarse silica particles (800 μm diameter) increases significantly on increasing the temperature from 300 to 500°C. Under other conditions, the reverse is true and the damage decreases with increasing temperature. Thus, erosion by fine silica particles (100–150 μm diameter) at 5 m s −1 is less at 500°C than at 100°C. Likewise, damage by coarse particles at 1 m s −1 and 3 m s −1 decreases as the temperature is increased from 100°C to 600°C. The explanations for these observations and the mechanisms of damage are discussed in terms of the observed morphologies of the eroded surfaces. Under severe conditions, oxidation-enhanced erosion predominates while under less severe conditions oxides protect the surface from damage.
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