The 42CrMo4 steel is a material popularly used in weapon manufacture. This article that deals with improving wear resistance of gun components will study tribological behaviour of above steel, treated by plasma nitriding technologies under different condition of duration and gas ratio. The friction coefficient and wear rate were investigated using the wear test based on principle “ball on disc”. The results were supplemented with mechanical properties and metallographic documentations. The results show that plasma nitriding improved dramatically the mechanical properties and wear resistance of materials, and the level of wear resistance was related to the nitriding process parameters.
Concerning with effort to replace hard chrome plating cause of its ecological issues, this paper investigates the effects of surface technologies to wear resistance of ISO 42CrMo4 steel, which is popularly used in weapon production. After quenching and tempering, the experimental samples were treated by nitrocarburizing (tenifer), hard chrome plating and plasma nitriding technologies. Plasma nitriding was carried out with different gas mixture at 500ºC (plasma nitriding process) for 15h. The wear test based on principle "pin on disc" was performed to evaluate the coefficient of friction and the wear rate. The results were supplemented with surface hardness test and metallografical evaluation. The experiment results point out that nitrocarburizing and plasma nitriding improve wear resistance better than hard chrome plating.
This study presents the development of a novel equipment for carburizing, by means of a plasma arc and a graphite paste based on liquid glass. After processing by this method, the microstructure and microhardness of the hardened layer were studied. The assay revealed that during a brief plasma exposure, the surface layer was saturated with carbon to a concentration level, which corresponds to white cast iron. The microstructures and characteristics of the metal surface post plasma cementation were also studied. The main parameters of the cemented layer were determined: the depth of the cemented layer was 150-200 μm, microhardness was up to 1000 HV0.2.
The present study was directed to investigate the mechanical and tribological properties of 42CrMo4 (CSN 41 5142.3) steel, which was thermochemical treated by the technologies of tenifer, manganese phosphate and plasma nitriding combining with blackening. Plasma nitriding was carried out for the samples under different condition of gas mixture under temperature of 480ºC (plasma sputtering) and 500ºC (plasma nitriding process) for 10h. Besides determining the microhardness (HV 0.05), surface hardness, and microstructure, this paper also concentrates on the field of wear resistance evaluation and friction coefficient of these surface treatments. Based on "ball on flat" test, calotest, and profile observation, it was found that tenifer technology is suitable to increase the wear resistance, and manganese phosphate improves clearly not only wear resistance but also friction coefficient, which can be usable for weapon production.
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