engleski

INFLUENCE OF CONVENTIONAL AND POWDER METALLURGY COLD WORK TOOL STEEL SUBSTRATES ON MICROSTRUCTURAL AND TRIBOLOGICAL PROPERTIES OF PVD HARD COATINGS

It is well known that properties of hard coatings do not only depend on deposition process parameters (substrate temperature, ion bombardment during growth), but also critically depend on the tool material (composition, crystal structure and microstructure) and its pretreatment. It is thus important to choose the substrate material and its pretreatment very carefully. In this work, microstructural and tribological investigations of TiAlN-coated conventional and powder metallurgy cold work tool steel substrates (Vanadis 4, Vanadis 6, Sleipner, Vancron 40, D2, ASP30) are presented. Deposition system CC800/7 (CemeCon) equipped with four unballanced magnetron sputter sources was used for preparation of TiAlN hard coating. In this paper, special emphasis is given on surface topography of uncoated and coated substrates and on the influence of tool steel substrate on microstructural and mechanical properties of hard coating. The topography of samples was analysed by optical microscope, field emission scanning electron microscope (SEM), atomic force microscope (AFM) and stylus 3D-profilometer.

cold work tool steel; powder metallurgy steel; PVD hard coatings; microstructure; adhesion; hardness; surface topography

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