Scratch test analysis of coated and uncoated nitrided steel

The mechanical properties of duplex-coated steel, nitrided steel and untreated steel were characterised by means of scratch testing. It was obtained that upon nitriding, the yield stress of steel increases from 2.7 to 7 GPa and the ductility decreases. For the duplex-coated steel, which consists of...

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Bibliographic Details
Published in:Surface & coatings technology 2004-01, Vol.177, p.284-288
Main Authors: Kamminga, J.-D., Alkemade, P.F.A., Janssen, G.C.A.M.
Format: Article
Language:English
Subjects:
Chromium nitride
Duplex treatment
Nitriding
PAPVD
Scratch test
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Summary:The mechanical properties of duplex-coated steel, nitrided steel and untreated steel were characterised by means of scratch testing. It was obtained that upon nitriding, the yield stress of steel increases from 2.7 to 7 GPa and the ductility decreases. For the duplex-coated steel, which consists of a 1 μm Cr 2N layer on nitrided steel, the adhesion of the Cr 2N layer was very good, despite the presence of some iron nitride at the coating–substrate interface. The influence of the Cr 2N layer on the mechanical properties of the nitrided steel is discussed. The Cr 2N coating slightly affects the hardness of the specimen and the friction of the sliding indenter. However, the crack patterns in the scratch tracks are influenced considerably.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2003.09.006