DOI: 10.18503/1995-2732-2024-22-4-111-119
Abstract
The paper describes the effect of temperature and duration of the ion nitriding process in an arc discharge using a plasma source with a pumped cathode on the mechanical characteristics of the surface, particularly, on the adhesion strength of the coating and the wear resistance of the surface after complex ion-plasma treatment. The complex ion-plasma treatment consists of ion nitriding and subsequent application of a protective multilayer coating of the (TiAl)N system, carried out in a single vacuum cycle. The material used was high-speed steel P6M5. Adhesion strength was investigated by sclerometric method. Wear resistance was investigated using the ball-on-disk technique. The results showed that surface microhardness increases with time in average 1.5 times from 860-870 HV to 1080-1520 HV depending on temperature. Moreover, it was determined that with increasing nitriding time there is an increase in adhesion strength up to a depth of ~40 µm. With increasing duration of the nitriding process, the critical failure load of the coating increases, however, the results of the elastic recovery factor We show that for longer regimes, the elastic recovery after load removal is about 30-40%, while for 30-60 minutes coating, it is about 50-60%. Adhesion studies have shown a mixed mechanism of wear, which combines adhesive and abrasive effects. According to the totality of investigated physical and mechanical characteristics it was determined that the technology with treatment modes T = 475°C, t = 35 min has comparatively highest properties, namely wear intensity of 11·10-5 g, adhesion strength of 19.5 N and surface microhardness of about 1270 HV.
Keywords
ion nitriding, vacuum-arc coatings, complex ion-plasma treatment, high-speed steel, adhesion strength, tribological characteristics
For citation
Nagimov R.Sh., Vafin R.K. Study of the Influence of Temperature and Duration of Ion Nitriding in an Arc Discharge on the Mechanical Characteristics of the Surface after Complex Ion-Plasma Treatment. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2024, vol. 22, no. 4, pp. 111-119. https://doi.org/10.18503/1995-2732-2024-22-4-111-119
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