Slip-rolling Resistance Of High Performance
Thin Films And High Toughness Steel Substrates
Under Extreme Conditions
Author(s)
C. Scholz, C.-A. Manier & M. Woydt
Abstract
Nowadays, diamond-like carbon (DLC) coatings are mainly used in many low
loaded applications such as in machine tools, computer devices and many more.
Especially the automotive industry anticipates a benefit in applying such
coatings in association with the lightweight construction of mechanical parts, for
instance in gear components. The ulterior motive is a global performance
increase regarding environmental impact and power efficiency. In recent years,
the slip-rolling resistance of DLC, a-C and ta-C thin film coatings was improved
considerably. In view of the mechanical application of thin film coatings, there is
still room for improvements. It was experimentally shown, that a-C and ta-C
coatings can be slip-rolling resistant at room temperature in unaddivated paraffin
oil up to ten million cycles under Hertzian contact pressures up to
P0max = 2.9 GPa. Typically, the prime coated steel substrates were made of the
hardened and tempered steels 100Cr6H and Cronidur 30. The aim of the work
this to overtake these results, i.e. at higher maximum Hertzian pressures up to
P0max = 4.2 GPa. Under such extreme conditions, it is necessary to choose special
steels to avoid the failure of the substrate and to permit a higher load carrying
capacity of the coating-substrate-system. In consideration of the increased
substrate properties, two high toughness spring steels and an ultra-high
toughness aerospace steel were tested on a twin disc tribometer of the Amsler
type as well as on an Optimol TwinDisc test rig under mixed/boundary
conditions. Different factors such as residual stresses of the substrate, influences
of the lubrication, and wear behaviour were investigated. The respective results
are presented here.
Keywords: slip-rolling, high toughness steel, DLC, a-C, thin film coating.
Keywords
slip-rolling, high toughness steel, DLC, a-C, thin film coating
Related Book
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