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Original scientific paper

PACVD Duplex Coating for Hot Forging of High Strength Steels for Automotive Applications

Vojteh LESKOVŠEK ; Institute of Metals and Technology, Ljubljana, Slovenia
Monika JENKO ; Institute of Metals and Technology, Ljubljana, Slovenia
Bojan PODGORNIK ; University of Ljubljana, Center for Tribology and Technical Diagnostics, Ljubljana, Slovenia

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page 39-44

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The tribological load is the load on forging tools resulting from the
relative motions between the plastically deformed workpiece and the die.
In comparison to many other forming processes hot die forging has an
especially disadvantageous tribological system. The advantages of the
application of hard coatings, which are well known for cutting tools, are
to a much lesser extent explored for casting, extrusion, moulding and
forging tools. Increasing the lifetime of these tools is an important task
in surface engineering because of the complex loading conditions and
often complicated tool geometry. The plasma-assisted chemical-vapour-
deposition (PACVD) technique is well suited to depositing hard coatings
onto large dies and moulds. The aim of this study is to present and discuss
results obtained on a duplex PACVD hard coating in an industrial application
such as hot forging of automotive parts. The results presented here are
from a preliminary investigation. The experimental results indicate that
introduction of a proper duplex PACVD hard coating will lead to improved
wear resistance and longer lifetime for hot-forging dies. Furthermore, by
using a hard, lowfriction coating excellent anti-sticking property can be
obtained. At this stage of the investigation it is also necessary to carry out
pilot trials to determine the wear resistance and tool life in practice.


Adhesion; Drop-forging die; Hardness; Microstructure; PACVD coating; Hot-work tool steel

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