Abstract
Specific wear rates were calculated from a series of micro-scale abrasive tests by means of the calotte-grinding method. The tested material was a CrN coating deposited by arc evaporation on ion-nitrided AISI H13 steel. Characterizations included: phase analysis, chemical composition, metallography, microhardness, micro-scratch resistance and nano-indentation hardness. On wear testing, the counter body was a 30 mm diameter steel ball rotating at a tangential speed of 9.42 m/min and normal load of 0.54 N. The abrasive was a mono-crystalline diamond micro abrasive paste, 1 micrometer grit. Wear volumes were calculated by measuring the wear scars at various test intervals. In non-perforating tests, Archard's wear equation was directly employed for calculating coating wear rate as the slope of the linear least square data fit. In perforating tests, Allsopp's method was employed for the simultaneous determination of coating and substrate wear rates, from the slope and intercept values of the linear least square data fit. Coating specific wear rate values obtained from both non-perforating and perforating tests were very consistent, with a relative difference within 6%. Relative errors in specific wear rate values were estimated to be of the order of 0.05 for the coating and 0.2 for the substrate.
Highlights
In surface engineering, the term duplex treatment refers to the sequential application of two surface modification technologies with the aim of producing a composite surface of such combined properties that are not obtainable through any of the individual technologies[1]
The aim of this work was to assess the micro-scale wear behavior of a Chromium nitride (CrN) PVD coating deposited on ion-nitrided AISI H13 tool steel
Iron nitrides are readily identified as stringer-like phases that extend in the form of a continuous network along the grains within the nitrided layer
Summary
The term duplex treatment refers to the sequential application of two surface modification technologies with the aim of producing a composite surface of such combined properties that are not obtainable through any of the individual technologies[1]. One type of duplex treatment of great technological importance is the process combination of atomic diffusion hardening followed by the deposition of a thin hard coating (oftentimes a nitride-type compound). PVD coating of nitrided steel substrates is perhaps the most popular duplex treatment technology currently in use[2,3,4,5,6]. Duplex surface treatments have found extensive use in tribological applications because of their low friction and adequate balance between surface hardness, shear stress resistance, fracture toughness and load bearing capacity[7,8,9]. Since PVD coating thickness is only about a few micrometers and the abrasive particles may be even smaller, the term micro-scale
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