TiCN coatings on the market today are in general multi-layer TiNy Ti(C N
) coatings. Such multilayered film configuration
x
1yx
enables optimisation of the filmysubstrate as well as the filmyworked material interactions, by controlling the internal stress state,
fatigue toughness, hardness and superficial composition of these Ti(C N
) coatings. This paper presents the results of the
x
1yx
investigations on a wear resistant coating made by alternate layers of TiN and Ti(C N
) (nominal 0.5 mm each), deposited on
x
1yx
S600 tool steel by reactive cathodic arc evaporation using a reactive gaseous mixture of methane and nitrogen. Microstructural
and compositional characterisation were carried out using ball crater tests, Optical Microscopy, Scanning Electron Microscopy
associated with Energy Dispersive Microanalysis and Image Analysis. Micro hardness measurement were evaluated by means of
the Chicot and Lesage volume law of mixture model to cope with the problem of the multiple influence of the different layers
and the substrate on the real multilayer surface hardness. In order to predict the surface hardness, the model needs the knowledge
of the properties of each type of layers and of the substrate (Young modulus, H shardness at infinitely small load and nsstrain
0
hardening coefficient, or ISE index). These properties were measured using microindentation tests from ad hoc samples of single
TiN 0.5 mm layer film, single Ti(C N
) 0.5 mm layer film and the uncoated substrate. Young modulus for the TiN and TiCN
x
1yx
were evaluated with load–displacement nanoindentation tests; Young modulus for the substrate is from manufacturer. Thickness,
composition profiles and microstructure of each film were used to qualify the data input for the model. Experimental measurements
on the composite surface hardness allowed then the verification of the predictions. ? 2001 Elsevier Science B.V. All rights
reserved.
TiCN coatings on the market today are in general multi-layer TiNy Ti(C N) coatings. Such multilayered film configurationx1yxenables optimisation of the filmysubstrate as well as the filmyworked material interactions, by controlling the internal stress state,fatigue toughness, hardness and superficial composition of these Ti(C N) coatings. This paper presents the results of thex1yxinvestigations on a wear resistant coating made by alternate layers of TiN and Ti(C N) (nominal 0.5 mm each), deposited onx1yxS600 tool steel by reactive cathodic arc evaporation using a reactive gaseous mixture of methane and nitrogen. Microstructuraland compositional characterisation were carried out using ball crater tests, Optical Microscopy, Scanning Electron Microscopyassociated with Energy Dispersive Microanalysis and Image Analysis. Micro hardness measurement were evaluated by means ofthe Chicot and Lesage volume law of mixture model to cope with the problem of the multiple influence of the different layersand the substrate on the real multilayer surface hardness. In order to predict the surface hardness, the model needs the knowledgeof the properties of each type of layers and of the substrate (Young modulus, H shardness at infinitely small load and nsstrain0hardening coefficient, or ISE index). These properties were measured using microindentation tests from ad hoc samples of singleTiN 0.5 mm layer film, single Ti(C N) 0.5 mm layer film and the uncoated substrate. Young modulus for the TiN and TiCNx1yxwere evaluated with load–displacement nanoindentation tests; Young modulus for the substrate is from manufacturer. Thickness,composition profiles and microstructure of each film were used to qualify the data input for the model. Experimental measurementson the composite surface hardness allowed then the verification of the predictions. ? 2001 Elsevier Science B.V. All rightsreserved.
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