Author/Authors :
Bonny، نويسنده , , K. and De Baets، نويسنده , , P. and Quintelier، نويسنده , , J. and Vleugels، نويسنده , , J. and Jiang، نويسنده , , D. and Van der Biest، نويسنده , , O. and Lauwers، نويسنده , , B. and Liu، نويسنده , , W.، نويسنده ,
Abstract :
Flat samples of WC–Co hardmetals with 6–12 wt%Co were surface finished by grinding, polishing and wire-electro-discharge machining (EDM). Comparative dry reciprocating sliding experiments against WC–6 wt%Co pins were performed using a Plint TE77 tribometer. Tribological characteristics were recorded online. Wear surfaces were characterized by surface scanning topography and scanning electron microscopy. Wire-EDM’ed samples exhibited higher friction and wear compared to ground and polished equivalents. This trend was correlated to X-ray diffraction measurements revealing tensile residual surface stresses in WC after wire-EDM contrary to compressive surface stresses after grinding and polishing. However, finer executed EDM reduces friction and wear significantly.
Keywords :
WC–Co cemented carbide , Pin-on-plate , Surface Finish , Wire-EDM , Dry reciprocating sliding
