Abstract
To improve the wear resistance of cutting tools made of high-speed steel, the Diamond-Like Carbon (DLC) coating appears as a promising alternative. There are several methods to assess wear, however, it is a challenge for manufacturing engineering to work with thin films, due to the uncertainty in the boundary of the substrate and the coating. Based on this concern, this study proposed the evaluation of the tribological behavior of the DLC coating deposited on AISI M35 steel, seeking to predict its behavior in machining conditions based on characterizations, nano-indentation, micro-abrasion and ball-on-disc test. Results showed that the DLC coating produced for this study consists mainly of sp2 hybridizations. The results of the nano-indentation showed that DLC coating may have a better wear resistance when compared to high-speed steel, and the nano-hardness and Young's modulus do not necessarily obey a positive correlation. Compared to high-speed steel, DLC provided reductions of 71% and 69% without micro-abrasive wear and without friction coefficient during sliding, respectively.
Highlights
Diamond-Like Carbon (DLC) refers to allotropic forms of carbon that are metastable[1] and have an amorphous structure consisting of carbon-carbon bonds in sp[2] configuration and carbon-carbon bonds in sp[3] configuration[2]
The combination of these three elements can lead to the precipitation of the Fe3W3C carbide, called M6C26. used the AISI M35 to develop a computational study of planning the microstructure of HSS
This study evaluated the tribological behavior of the DLC deposited on AISI M35 steel, seeking to predict its behavior under machining conditions based on chemical, structural, roughness, mechanical properties of nano-hardness and Young’s modulus and performance in wear tests by micro-abrasion and by sliding, comparing conditions with and without the DLC
Summary
Diamond-Like Carbon (DLC) refers to allotropic forms of carbon that are metastable[1] and have an amorphous structure consisting of carbon-carbon bonds in sp[2] configuration (graphite) and carbon-carbon bonds in sp[3] configuration (diamond)[2]. To reduce the intrinsic disadvantages of amorphous carbon films, studies are carried out to investigate the addition of elements (doping and/ or interface layer) such as titanium, chromium, tungsten, nitrogen, silicon, among others[2,18] evaluated the applicability of DLC a-C: H as a coating for cutting tools in the dry turning process of hardened AISI 52100 steel. Based on the overview presented, this study proposed to evaluate the tribological behavior of the DLC film deposited on AISI M35 high-speed steel, seeking to predict its behavior under machining conditions based on structural characterizations, nano-indentation and performance in micro-abrasion wear tests and by pin-on-disc wear test. The first topic presents the information on AISI M35 steel, the coating deposition process, the techniques used for chemical, structural, roughness, nano-hardness characterization, Young’s modulus, in addition to the apparatus used for the tribological wear tests by micro-abrasion and pin-on-disc wear test. The main results and analyzes are summarized in a conclusion
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