Abstract
The mechanisms of erosion in ductile metals subjected to the impact of solid particles are discussed and experimental observations are presented. The possible effects associated with the local temperature rise caused by particle impact are discussed and a simple heat diffusion model is used to identify the regime of particle impact velocity and particle size over which the deformation may be treated as effectively adiabatic. Heat conduction is found to play an important role in reducing the maximum temperature rise in all practical cases of erosion and the cumulative effect on the temperature rise of successive impacts is shown to be negligible. It is concluded that the lack of influence of metallurgical strengthening mechanisms on erosion resistance cannot be satisfactorily explained by postulating the formation of a thermally softened surface layer.
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