Wear Progress Of Nitrided Microstructures In
Tribological Simulation Of
Aluminium Hot Extrusion
Author(s)
M. Tercelj, I. Perus & G. Kugler
Abstract
The study of wear of a tribological pair of soft and heated metals in contact with
a hard counter body is very demanding. So far, less attention has been devoted to
this problem and thus progress in this field is needed. In Al hot extrusion also the
mentioned tribological system prevails but it is also supposed that various
contact pressures between extruded Al die bearing surfaces takes place. In order
to explain wear behaviour on die bearing surfaces wear tests of nitrided surfaces
at low, medium and higher contact pressures using block on cylinder test
equipment were carried out. Tested surfaces at medium contact pressures exhibit
some significances obtained at testing at lower as well as at higher contact
pressures. Essentially, the difference at medium contact pressure is higher
density of partial removal of compound layer on spots of its previous initial
cracking in comparison to lower contact pressure. At higher contact pressure
removal of the compound layer is already preferentially oriented in the sliding
direction in the first stage, while at medium contact pressure this is observed
only in later stages of the degradation progress.
Keywords: aluminium hot extrusion, die wear progress, nitrided microstructures,
compound layer, cracking.
1 Introduction
Hot extrusion is normally used for forming long Al products, like rods, beams,
wires, etc. Over 95% of all extrusion dies are gas nitrided since application of
PVD coatings has some limitations due to \“line-of-sight” effect at coating in
narrow gape of complex shaped dies. In order to increase the service time of the
Keywords
aluminium hot extrusion, die wear progress, nitrided microstructures,
compound layer, cracking
Related Book
Other papers in this volume
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