Samples A2, A3, B1, B2 and B3 show HF5 and HF6 adhesion strength qualities, indicating a poor adhesion to the substrate. Failure of the coating occurs with delamination due to the growth of radial cracks and to pile-up formation in the substrate. The A1 and A4 coatings show HF4 adhesion strength quality and failure of the coating also occurs by delamination due to the same mechanisms mentioned above, although in a smaller extent. HF4 adhesion strength quality may be interpreted as a transition between good adhesion and poor adhesion. None of the specimens showed circular cracks in the neighborhood of the indentation.