Effect of surface finishing on the elastic contact area evaluation of austempered ductile iron

Abstract

The effect of surface finishing on the contact area evaluation of an austempered ductile iron (ADI) with 10% volume fraction of graphite nodules is presented. The nodules were scratched during the roughness measurement made using a stylus. A model based on two functional roughness parameters was used to evaluate the contact area, considering the deformation as elastic. Two sets of ADI specimens were prepared. In the first set, the surfaces were sanded up to 1200‐grit paper, whereas in the second set, the specimens were metallographic polished. The scratches were artificially removed using a specific routine. The results after this removal were compared with those determined for bearing steel, prepared under similar conditions. A reduction of approximately 93% in the contact area values was observed after the artificial removal of scratches caused by the stylus probe for the polished specimens, whereas for the sanded ones, this reduction was about 80%. Copyright © 2012 John Wiley & Sons, Ltd.

Abrasive Wear Resistance of High-Strength Compacted Graphite Iron under Microabrasion Conditions

“…Comparing Figure 5a,b, the higher the crater, the higher the graphite area. The scratching of the cast iron was strongly affected by the presence of graphite, disturbing the widths of the grooves, as described previously by Do Vale et al [2]; therefore, there was a need to take into account this effect during roughness measurements, applying specific filters to distinguish the graphite effect, as done previously by Pintaude et al [19].…”

The effect of graphite number per area on tribological behavior of high-strength compacted cast irons in lubricated tests

“…This is the most significant microstructural aspect defining the topographical changes that occurred during the lubricated tests. When nodular graphite was put in contact with the stylus profilometer, graphite areas were scratched [25]. It means that the elastic contact area changed significantly without the presence of graphite areas.…”

TriboBR 2010 special issue editorial

“…Tribological studies include friction coefficient and formation of transfer layer. The influence of surface finishing on contact mechanics is illustrated by the paper of Pintaude et al The paper report a model based on two functional roughness parameters used to evaluate the effect of surface finishing on the elastic contact area evaluation of austempered ductile iron.…”