Abstract
The aim of this study was to assess whether it is possible to produce a high adhesive carbon coating by applying low-temperature RFCVD and glow discharge methods on nanobainitic X37CrMoV5-1 steel with and without nitrided sublayer. For this purpose, several methods of investigation were used: observations of coating morphology by scanning electron microscopy (SEM), analysis of bonds found in coatings (Raman spectroscopy), microhardness tests and adhesion of coatings (Scratch tests). Our research has shown that low-temperature RFCVD and glow discharge processes of nanobainitic X37CrMoV5-1 steel allow producing carbon coatings that can be described as hardened carbon coatings with very high hardness—> 2000 HV 0.25 in case of RFCVD processes and > 3300 HV 0.025 for glow discharge process and low friction coefficient—near 0.12 at 5 N load. However, the adhesion of produced coatings to the steel substrate strongly depends on the appropriate selection of the process parameters and on the proper preparation of the substrate before the deposition regarding the thermal stability of nanobainite.
Highlights
PROGRESS in industrial productions is often strongly related to the development of new highstrength materials
Carbon coating produced in glow discharge conditions (GDCC) on the surface of nanobainitic steel did not show any adhesion to the nanobainitic substrate and dropped off immediately (Figure 2(a))
Residual stresses, an additional process was carried out before the carbon coating formation. It consisted of low-temperature glow discharge nitriding in glow discharge conditions (NGDCC)
Summary
PROGRESS in industrial productions is often strongly related to the development of new highstrength materials. Particular attention is paid to the new generations of steel, which combine high mechanical properties with low production costs. One of the most promising ways to improve the strength and performance of steel components is the use of steels with nanobainitic microstructure. This can be obtained through bainitic transformation.[1,2,3] Nanobainitic steels are characterized by a good compromise among strength, ductility and fracture toughness compared to steels with conventional tempered martensite microstructure. The nanobainitic microstructure has been obtained in steels with a specially designed chemical composition, with high content of carbon and manganese, ensuring high hardenability and stabilization of residual austenite and an increased amount of silicon, inhibiting the precipitation of cementite during
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