The Changes of Surface Texture Parameters of the Duplex Systems: Nitrided Layer – Coating at CoCrMo Alloy

Dobrocký, David; Klanica, Ondřej; Onderka, Filip

doi:10.1149/06301.0255ecst

Cited by 8 publications

(8 citation statements)

References 3 publications

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“…The surface roughness of the nitrided samples was reduced when compared to the ground surfaces, according to surface texture analysis using specified 2D and 3D parameters [13]. Dobrocký et al [14] in other study. investigated the effects of plasma nitriding on the surface texture parameters of the CoCrMo alloy.…”

Section: Researchmentioning

confidence: 97%

Experimental Investigation on Roughness Parameters of 42CrMo4 Steel Surface During Nitrocarburizing Treatment

Ghelloudj¹,

Hannachi²,

Djebaili³

2022

Tribol. Ind.

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To evaluate the performance characteristics of various surfaces, a detailed and precise description of the surface's micro-geometry properties is required. In this context, roughness is a reliable indicator of the possible behavior of mechanical piece performance, since distortions on the surface can form a direct cause for cracks or corrosion. As a result, characterization of surface roughness is very important for zero-defect fabrication. This paper investigates the 2D roughness parameters of a 42CrMo4 steel surface before and after nitrocarburizing treatment. The latter was accomplished at 580 °C for 10 hours in a salt bath containing sodium cyanates and potassium carbonates. A surface profilometer was used to analyze the influence of nitrocarburizing treatment on the material's surface roughness parameters behavior. The parameters that comprehensively describes the surface structure, namely the amplitude, spacing, hybrid parameters, and material ratio parameters were highlighted. The results of the experiments indicated that the nitrocarburizing treatment was effective in increasing almost all the 2D roughness parameters of the 42CrMo4 steel surface.

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Section: Researchmentioning

confidence: 97%

Experimental Investigation on Roughness Parameters of 42CrMo4 Steel Surface During Nitrocarburizing Treatment

Ghelloudj¹,

Hannachi²,

Djebaili³

2022

Tribol. Ind.

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“…The most significant disadvantage of compound layer creation is their connectivity with changing dimensions of components. Due to changing dimensions, many parts must be finely ground to achieve the initial dimension accuracy [19,20].…”

Section: Resultsmentioning

confidence: 99%

“…By applications of available gas nitriding technology, it is possible to reach significant enhancement of surface microhardness of raw material (core) in annealed, tempered or quenched structural state. The increase of surface microhardness significantly depends not only on initial microhardness of core but also on chemical composition, especially on the concentration of alloying elements as chromium, molybdenum, nickel or vanadium [16,19].…”

Section: Introductionmentioning

confidence: 99%

Influence of alloying elements on gas nitriding process of high-stressed machine parts of weapons

Pokorny¹,

Dobrocký²,

Kadlec³

et al. 2018

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The chemical composition of the steel is one of the primary characteristics that influence the mechanical properties of high-stressed machine parts such as barrels of small arms weapon. Heat treatment is the most important technology to reach requested mechanical properties. By a suitable combination of mechanical and tribological properties, it is possible to improve the surface of highly stressed parts as to improve the wear resistance of barrel surface. Thus, surface technology is next step for obtaining new properties as tribological properties or preferable mechanical properties. Due to obtain suitable microstructure and wear resistance the samples of C35, 34Cr4, 37Cr4 and 42CrMo4 were heat-treated with following chemical heat treatment by gas nitriding process, for 6 hours. This paper deals with the influence of alloying elements of structural steels on surface microhardness and depth of diffusion layer. The gas nitriding process caused the creation of a compound layer on the surface of the steel. This layer leads to significant improvement in wear resistance. The concentration of alloying elements was analysed by OES methods. The technology of nitriding was applied to annealed, tempered and quenched steels. After chemical heat treatment, new surface morphology was created. The surface layers of the samples were analysed by microhardness method; surface morphology was evaluated by SEM method. Experimental part concerns structural steels with a concentration of alloying elements to 1 wt.%. In experimental part, the influence of alloying elements on the diffusion process in Fe-C system and the microhardness of the surface was proved.K e y w o r d s : gas nitriding, microhardness, chemical composition, diffusion, barrel

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“…The useful properties of this coating can be increased by chemical-heat treatment of the base material (substrate), i.e. by creating a hard layercoating duplex system [29,30,31]. The diffusion layer formed, for example, by the nitriding process, increases the hardness of the substrate surface, which improves the adhesion of hard coatings on soft substrates and further increases the load-bearing capacity and fatigue strength of the substrate [32].…”

Section: Introductionmentioning

confidence: 99%

Possibilities of Using the Duplex System Plasma Nitriding + CrN Coating for Special Components

Dobrocký¹,

Pokorny²,

Joska³

et al. 2022

Preprint

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The purpose of material selection and surface treatment for a given component is to assure the weapon's failure-free and dependable operation throughout its life time. At the same time, the material and surface technology chosen must take into account the chosen manufacturing method in terms of material attributes, as well as the economics and ecology of production. A gas piston is one of the most visible parts of high-performance small weapons (automatic rifles) that provides its own drive (automation of the functional cycle). The pressure and temperature of the propellant gases, as well as dynamic shocks and wear, put a lot of strain on the gas piston, which puts a lot of strain on the piston material. Steel C55, 80Mn4, 31NiCr14, 42CrMo4, X30Cr13, and X30WCrV9.3 are the most common materials for gas pistons, which are hard chrome plated. Hard chromium plating, which is extremely damaging to the environment and human health, is currently being replaced by PVD or CVD methods. PVD coating deposition processes, for example, have shown to be viable options. Surface treatments including the application of layers and subsequent deposition of coatings are one option (duplex system). The article discusses the use of CrN coating to replace hard chromium plating and the duplex system plasma nitriding + CrN coating (hence PN + CrN). For testing, 42CrMo4 steel was chosen. The strong chrome coating as well as the CrN coating itself were compared to the PN + CrN duplex system. The mechanical and tribological properties, as well as the shape and texture of the surface, were all examined. For exposed sections of small weapons, the PN + CrN duplex system has proven to be a viable alternative to hard chrome coating.

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The Changes of Surface Texture Parameters of the Duplex Systems: Nitrided Layer – Coating at CoCrMo Alloy

Cited by 8 publications

References 3 publications

Experimental Investigation on Roughness Parameters of 42CrMo4 Steel Surface During Nitrocarburizing Treatment

Experimental Investigation on Roughness Parameters of 42CrMo4 Steel Surface During Nitrocarburizing Treatment

Influence of alloying elements on gas nitriding process of high-stressed machine parts of weapons

Possibilities of Using the Duplex System Plasma Nitriding + CrN Coating for Special Components

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