Modelling of two-body abrasive wear under multiple contact conditions

Abstract A general model for wear rate and specific wear energy of materials in two-body abrasive wear under multiple contact conditions is presented. Wear mode transitions and material removal fraction have been considered. This model is further evaluated under various conditions by assuming conical particles with round tips. To validate the model, the effect of grit size and repeated sliding on abrasive wear and specific wear energy of a high carbon steel treated to martensite and pearlite microstructures have been experimentally investigated under various conditions. Typical variations of wear rate as a function of grit size have been observed for both microstructures and the critical grit sizes were identical. Specific wear energy decreased with increase in grit size and showed a similar critical grit size to wear. The harder martensite microstructure exhibited lower wear rate and higher specific wear energy. The same order of magnitude of wear rate and specific wear energy as experimentally observed values has been predicted using the model. The grit size effect is explained on the basis of the model. It is concluded that the presence of a critical grit size mainly results from the rounded feature of tip geometry of particles, in agreement with Sin et al. [H. Sin, S. Saka, N.P. Suh. Abrasive wear mechanisms and the grit size effect. Wear 55 (1979) 163–190]. It is shown that for ideally sharp particles, the classical abrasion model applies and no ssize effect is expected. The size effect can be observed for tip radius as small as 0.5 μm.

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