Investigation of the Temperature-Related Wear Performance of Hard Nanostructured Coatings Deposited on a S600 High Speed Steel

Abstract

Thin hard coatings are widely known as key elements in many industrial fields, from equipment for metal machining to dental implants and orthopedic prosthesis. When it comes to machining and cutting tools, thin hard coatings are crucial for decreasing the coefficient of friction (COF) and for protecting tools against oxidation. The aim of this work was to evaluate the tribological performance of two commercially available thin hard coatings deposited by physical vapor deposition (PVD) on a high speed tool steel (S600) under extreme working conditions. For this purpose, pin-on-disc wear tests were carried out either at room temperature (293 K) or at high temperature (873 K) against alumina (Al2O3) balls. Two thin hard nitrogen-rich coatings were considered: a multilayer AlTiCrN and a superlattice (nanolayered) CrN/NbN. The surface and microstructure characterization were performed by optical profilometry, field-emission gun scanning electron microscopy (FEGSEM), and energy dispersive spectroscopy (EDS).

Dry Sliding Tribological Properties of a Hard Anodized AA6082 Aluminum Alloy

“…Therefore, as shown in Figure 10 the bright region corresponds to the chromium steel layer left on the ball trajectory by the counterbody, while the darker area is the GHA surface. The profilometry results obtained for all the tested samples were used to calculate the wear volume [47], which was used to calculate the specific wear rate W (mm 3 /Nm). The results of the wear rate calculations are reported in Figure 9.…”

Solutions of Critical Raw Materials Issues Regarding Iron-Based Alloys

“…These significant mechanical properties were inferred by nanoindentation, wear and thermal cycling tests; the main results are summarized and outlined hereafter. Experimental methods and procedures can be found elsewhere in previously published papers by one of the present authors (Cabibbo et al) [ 83 , 84 , 85 , 86 , 87 ]; thence, no changes in the surface roughness were observed up to 800 °C. The external surface of quaternary TiAl1-xCrxN (with x varying from 0.3 to 0.7) started to form scattered oxide spots whenever continuously exposed to a temperature of 800 °C.…”

Processing–Structure–Property Relationships in Metals

“…The book gathers manuscripts from academic and industrial researchers with stimulating new ideas and original results. It consists of one review paper regarding state of art and perspectives of alloys for aeronautic applications [1] and fifteen research papers [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] focused on different materials and processes.…”

“…A group of papers deals with the effect of ultra-fine or nanostructured grains on the mechanical properties, the materials are: a low-carbon steel processed by cryorolling [2], Mg-10Y-6Gd-1.5Zn-0.5Zr alloy submitted to two different heat treatments [3], AZ91 Mg alloy prepared by ECAP plus aging [4], hard nanostructured coatings deposited on a S600 high speed steel [5], and pure Cu deformed by simple shear extrusion, namely two forward and two reversed simple shear straining stages on two different slip planes [6]. The different routes used to produce ultra-fine or nanostructured grains introduce a variety of microstructures in terms of: (i) dislocation density and arrangement; (ii) size and orientation distribution of the grains; and (iii) size, shape, and fraction of secondary phases.…”