A note on threshold velocity criteria for modelling the solid particle erosion of WC/Co MMCs

Abstract

The threshold velocity for erosion of a ductile material is considered as the velocity required for initiation of plastic deformation in the substrate. For a brittle material, it defines the velocity required to nucleate a median crack in the elastic/plastic interface beneath the indentation. By invoking models for the solid particle erosion of ductile and brittle materials from the literature, together with a set of criteria based on threshold velocity calculations for erosion of the individual components, various predictions of erosion behaviour of WC/Co MMCs have been made. Qualitative agreement was found between the model predictions and various trends of the solid particle erosion behaviour of WC/Co cermets in the literature. The implications of the findings in addressing some of the puzzling trends of the solid particle erosion of MMCs in the literature, and how such insights may result in a reconsideration of some "classical" solid particle erosion relationships, are addressed in this paper

Mapping Synergy of Erosion Mechanisms of Tidal Turbine Composite Materials in Sea Water Conditions

“…Moreover, the fluctuation in erosive wear peaks can be attributed to the different slurries, angles of attack, particles characteristics and material as composites behave differently than metals (Fig. 4) [21].…”

Research on Erosion-Corrosion Rate of 304 Stainless Steel in Acidic Slurry via Experimental Design Method

“…The second is acid, concentration with contribution percentage of 5%. The smallest is speed only contribution percentage of 0.4%, such trend could be due to so-called speed threshold effect [34,35,36,37,38,39]. Only when impact speed is higher than threshold value will it cause wear rate transition of the test material [34].…”

“…The smallest is speed only contribution percentage of 0.4%, such trend could be due to so-called speed threshold effect [34,35,36,37,38,39]. Only when impact speed is higher than threshold value will it cause wear rate transition of the test material [34]. Although many investigations have indicated that impact velocity is a critical test variable on erosion wear rate [40], in this research the rotational speed of 1200 rpm, i.e., high level, could still not be high enough to reach the threshold velocity.…”

Wear of Hardmetals

“…Erosion maps for ceramics have also been generated using threshold velocity criteria and indicated the importance of particle size and velocity on the erosion rate transitions for these materials. However, Jana and Stack (Jana, 2011) have recently attempted to use such threshold velocity criteria for the ductile and ceramic phases of an metal matrix composite (MMC) to model the erosion behavior of a WC/Co hardmetal. Their erosion model was based on the establishment of critical velocity transitions for the onset of plastic deformation of the ductile matrix material and median crack formation of the brittle reinforcement, with the model predictions showing qualitative agreement with some, but not all, of the trends observed for the solid particle erosion of MMCs in the literature.…”