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Effect of surface finishing on the elastic contact area evaluation of austempered ductile iron
Author(s) -
Pintaude Giuseppe,
Brunetti Cristiano,
Leite Mario V.,
MontanezCalao Luis F.
Publication year - 2013
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.1178
Subject(s) - stylus , materials science , surface roughness , metallurgy , austempering , surface finish , volume fraction , contact area , deformation (meteorology) , cast iron , composite material , microstructure , austenite , bainite , computer science , operating system
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.