Abstract
A single impact technique has been used to study the erosion of turbine blade materials IN738C, IN739 and IN792 mod 5A, by sea salt particles. It has been shown that sea salt particles can cause severe erosive damage to these materials and that the predominant mode of material loss is by removal of oxide scale. The erosive response of these materials differs significantly at 700 and 850°C, the type of response being a function of the oxide scale thickness and plasticity, with lower temperatures and thicker oxides favouring brittle erosion behaviour of the surface scale. This behaviour can account for the reported increase in corrosion of super alloy materials at 700°C, provided that an erosive component is present in the system.
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