• Schiffer, Jurgen
• Summer, Florian
• Papadimitriou, Ilias
• Gódor, István
• Grün, Florian

Abstract

<p>The conclusions derived from this study are listed below: The used test methodology is appropriate to visualize the sliding performance of the tested systems under mixed friction regime. The pre-test surface treatment of the ring counterpart ensures surface preconditions similar to real life crankshafts. Additionally, an optimized GJS surface was produced exposing the graphite inclusions. The tested forged steel material (34CrNiMo6) shows good sliding performances with low wear tendencies and is a well selected counterpart material for current high-end bearing solutions. Furthermore, it has been depicted that the World Tribology Congress 2013 Torino, Italy, September 8 - 13, 2013 performance of the systems tested with 34CrNiMo6 was conditioned by the surface roughness of the steel surface. The smoother surface showed marginally better sliding conditions. GJS-tests with burrs around the graphite sticking out of the surface showed inferior sliding performances compared to tests with 34CrNiMo6. The sharp edges around the graphite cause abrasive friction and wear. Tribometric tests of GJS with a burr-free surface and exposed graphite showed sliding performances comparable to tests with 34CrNiMo6. On the one hand the exposed graphite is able to act as solid lubricant and on the other, if the graphite is consumed the residual holes serve as additional lubricant reservoirs thus enhance hydrodynamic contacts.</p>

Topics

• impedance spectroscopy
• surface
• inclusion
• steel
• iron
• cast iron