THE INFLUENCE OF SUBSTRATE MATERIAL ON THE EROSION RESISTANCE OF TIN-COATED TOOL STEELS

In the present study the influence of substrate material on the erosio n resistance of three different TiN coated tool steels (two high speed steels and one cold work steel) has been investigated. The particle v elocity was 20 m s(-1), two angles of impingement (20 degrees and 30 d egrees) were used and silicon carbide was used as erodent. The results showed that, the carbide volume fraction and the impact toughness of the substrate material controlled the erosion rate of both coatings an d substrates. It was concluded that as long as the test parameters all ow the impinging particles to significantly affect the substrate mater ial during erosive testing of a coated composite, the substrate materi al will influence the erosive response of the coating.