Abstract
Vickers and Knoop microhardness measurements on hard coatings on WC-Co substrates were studied as a function of indentation load. It is shown that the increase in conventional Vickers hardness with decreasing load, i.e. the indentation size effect, can be derived by considering the elastic recovery in indent length on unloading. It further follows that the large increase in microhardness at light loads (up to 100 gf) depends inversely on the elastic modulus of the hard coating. Microhardness numbers based on Vickers or Knoop diagonal measurements are shown to have varying sensitivity to the elastic recovery effect. Depending on coating thickness, the microhardness- load profiles can indicate the existence of gradient residual stresses in the coatings as well as effects due to the coating-substrate interface and the substrate hardness.
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