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, 2.25Cr1Mo steel, Fe12Cr 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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