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Solid particle erosion of an austenitic stainless steel was studied utilizing various metallographic techniques. Examination of single impacts on a polished surface resulted in a semiquantitative crater clmsiJication. It was, however, found that material removal generally involves the interactive effect of several cumulative impacts. Consequently, topography and internal structure of the target surface layer afier multiple impacts were investigated. In particular, preeroded targets were reexamined after additional single impacts.The strength of the suface layer was estimated by a simple tape experiment, which also supplied information of the size and morphology of presumptive wear debris. Two major erosion mechanisms were distinguished:1. Cutting erosion. Detachment of crater lips by cutting action of one or several impacts. Deformation erosion. Detachment of material by su face fragmentation due to multiple cumulative impacts.Suface layer hardness and duclility are the most important material properties for cutting and deformation erosion resistance, respectively.

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