Abstract
The article describes the results of an investigation focused on the properties of the Ti-TiN-(Ti,Cr,Mo,Al)N multilayered composite coating with a wear-resistant layer of nanolayer structure. A transmission electron microscope was used to study the coating structure. The examination of the phase composition using selected area diffraction electron pattern has detected the presence of two phases, including c-(Ti,Cr,Mo,Al)N and h-AlN. The cutting properties of the tool with the coating under consideration were studied during the turning of AISI 1045 steel at vc = 300 m/min, f = 0.25 mm/rev, and ap = 1.0 mm. After 16 min of cutting, the wear rate for the tool with the Ti-TiN-(Ti,Cr,Mo,Al)N coating was 1.9 times lower compared to the wear rate for the tool with the (Ti,Al)N commercial monolithic coating. As a result of the investigation focused on the fracture pattern on the coating during the cutting, the brittle nature of the fracture has been detected with a noticeable effect of adhesive fatigue mechanisms.
Highlights
Modified coatings developed for various purposes, coatings for metal-cutting tools, are being actively implemented in various areas of manufacturing activity
Authors of this paper studied the properties of the coatings with wear-resistant layers, including (Ti,Cr,Al)N [30,31,32], (Zr,Nb,Cr,Al)N [30,32], (Zr,Nb,Ti)N [32], (Zr,Cr,Al)N [32], (Nb,Zr,Ti,Al)N [32], and (Ti,Cr,Al,Si)N [33]
Four experiments were conducted for each coating, and the obtained values of flank wear were processed to get the polynomial functions exhibited on the curve
Summary
Modified coatings developed for various purposes, coatings for metal-cutting tools, are being actively implemented in various areas of manufacturing activity. The study focused on the properties of the (Ti,Cr)N coating found that the introduction of chromium (Cr) into the composition of the TiN coating is able to significantly increase the oxidation resistance due to the formation of dense chromium oxide (Cr2 O3 ) on the coating surface [18,19] This oxide is characterised by high heat resistance and does not transform into chromium trioxide (CrO3 ) until the temperature reaches 1100 ◦ C [20]. At temperatures exceeding 500 ◦ C, the Ni-containing coating wore out more intensively, and in [29], that fact was associated with the formation of the In their previous articles, authors of this paper studied the properties of the coatings with wear-resistant layers, including (Ti,Cr,Al)N [30,31,32], (Zr,Nb,Cr,Al)N [30,32], (Zr,Nb,Ti)N [32],. It can be assumed that coating Ti-TiN-(Ti,Cr,Mo,Al)N will have good tribological properties due to the formation of MoO3 and Cr2 O3 oxides with high hardness and wear resistance [18,19,20,21,22,23,24,29]
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