The aim of this study is to investigate the possibility of using PVD hard coatings such as TiN and CrN on the medium carbon substrates, which are typically used in cutting tool applications. selleck catalog Therefore, TiN and CrN hard coatings were deposited on prenitrided medium carbon steel (AISI 1070). The selleck chemicals steel substrates were nitrided in molten salt bath before the coating process. On-line monitoring system was used to investigate the wear resistance of CrN and Inhibitors,Modulators,Libraries TiN coatings, which were applied on AISI 1070 tool steel using the cathodic arc evaporation process technique. Experiments were carried out in a conventional lathe and the following parameters have been measured: the wear volume, cutting force, feed force, and thrust force of the counter material.

The performance of the prenitrided TiN- and CrN-coated cutting tools was comparatively studied.2.?Experimental Procedure2.1. Sample PreparationSubstrate samples with the size of 12mm��12mm��100mm were cut from medium carbon steel AISI 1070. The samples were heat-treated in a furnace at a temperature of 760 ��C for a period of 20 minutes and then Inhibitors,Modulators,Libraries they were quenched Inhibitors,Modulators,Libraries starting from the tip until the room temperature. The final hardness of the tool samples was about 62 HRC. All the samples were tempered at 180��C for a period of 40 min with the following composition (wt%) 0.794% C, 0.0229% Si, 0.023% S, 0.016% P, 0.3487% Mn, 0.0396% Ni, 0.0133% Cr, 0.0016 Mo, 0.0012% V, 0.02% Cu, 0.0016% Ti, 0.0011% Sn, and Inhibitors,Modulators,Libraries 0.0273% Al.

These samples were subsequently grounded, hardened, nitrided, polished and cleaned before the coating.

The steps for the Inhibitors,Modulators,Libraries sample preparation Inhibitors,Modulators,Libraries are given in Fig.1.Figure 1.Experimental process.2.2. Salt Bath NitridingTo obtain a nitrided layer, nitriding was used as the thermo-chemical surface treatment method, which improves the wear resistance of cutting Brefeldin_A tools. The cutting tools made Inhibitors,Modulators,Libraries of steel grade AISI 1070 were nitrided in a molten salt bath (CN) at about 570��C for 2 h. It is reported that, in a conventional process with high nitriding potential, partially compound zone of about 30 ��m thick was formed Inhibitors,Modulators,Libraries Dacomitinib [11]. The inner part is reported to be a ��’�CFe4N, ��-Fe2-3(NC), or mixed ��-��’ phase [11]. Conventional molten salt bath can be used to achieve the above described structure.

2.3. CoatingTiN and CrN coatings were deposited onto prenitrided cutting tools by using cathodic arc evaporation technique (CAVP) as the PVD coating method.

Prior to coating, the cutting tool samples were polished by mechanical selleck kinase inhibitor methods to the surface roughness of sellectchem Ra ~ 0.1 ��m. Then these samples were cleaned in an ultrasonic bath using basic alkali cleaner. The samples were vertically fixtured on a continuously rotating planetary holder inside the vacuum chamber. The purity of N2 gas used was 99.998% and that of the Ti target was 99.6 %.