Changes of the Surface Texture after Surface Treatment HS6-5-2-5 Steel

Klanica, Ondřej; Svoboda, Emil; Joska, Zdeněk

doi:10.21062/ujep/x.2015/a/1213-2489/mt/15/1/47

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…For steel H13, the surface roughness values were 50% to 70% higher than the UN material. Such deterioration is caused by a dedusting process, when the nitride cations bombard a material surface and subsequently atoms of various elements, being on a material surface are shot out [ 24 ]. The surface roughness of the coatings on steel HS6-5-2 was 245 percent to 295 percent higher than the UN material.…”

Section: Resultsmentioning

confidence: 99%

Effect of Boron and Vanadium Addition on Friction-Wear Properties of the Coating AlCrN for Special Applications

et al. 2021

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Cutting tools have long been coated with an AlCrN hard coating system that has good mechanical and tribological qualities. Boron (B) and vanadium (V) additions to AlCrN coatings were studied for their mechanical and tribological properties. Cathodic multi-arc evaporation was used to successfully manufacture the AlCrBN and AlCrVN coatings. These multicomponent coatings were applied to the untreated and plasma-nitrided surfaces of HS6-5-2 and H13 steels, respectively. Nanoindentation and Vickers micro-hardness tests were used to assess the mechanical properties of the materials. Ball-on-flat wear tests with WC-Co balls as counterparts were used to assess the friction-wear capabilities. Nanoindentation tests demonstrated that AlCrBN coating has a higher hardness (HIT 40.9 GPa) than AlCrVN coating (39.3 GPa). Steels’ wear resistance was significantly increased by a hybrid treatment that included plasma nitriding and hard coatings. The wear volume was 3% better for the AlCrBN coating than for the AlCrVN coating on H13 nitrided steel, decreasing by 89% compared to the untreated material. For HS6-5-2 steel, the wear volume was almost the same for both coatings but decreased by 77% compared to the untreated material. Boron addition significantly improved the mechanical, tribological, and adhesive capabilities of the AlCrN coating.

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Section: Resultsmentioning

confidence: 99%

Effect of Boron and Vanadium Addition on Friction-Wear Properties of the Coating AlCrN for Special Applications

et al. 2021

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“…In many cases, we are not able to select a perfect material that exactly meets our requirements. The technology of material development seems to be very expensive, therefore it is more effective and cheaper to use the available material with a combination of appropriate surface technologies [5]. Due to combined stresses, high pressure and also the abrasion, which must resist, the engine's crankshaft and the barrel of the small arm weapon have been chosen as referential parts [6,7].…”

Section: Introductionmentioning

confidence: 99%

Service Behavior of Nitride Layers of Steels for Military Applications

2020

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Steels which are utilized in the manufacturing of specific parts of military technology such as crankshafts of engines in heavy-duty vehicles or barrels of guns must be subsequently modified by heat treatment according to the requirements of customers. Despite the hard surface of martensitic structure obtained by hardening process, steels have a low wear resistance and high values of coefficient of friction. To improve these parameters and due to the fact that many of steels which are utilized for manufacturing of mentioned parts are also categorized as Nitralloy steels, in this paper, the improvement in these properties of chosen steels by the application of plasma nitriding has been studied. The steel equivalent 17Ni4CrMo (i.e., CSN 41 6720) and equivalent 42CrMo4 (i.e., CSN 41 5142) were chosen for the study. The chemical composition of chosen steels was verified by optical emission spectrometry. The microstructure and the diffusion layer were observed by optical microscopy due to the evaluation of layer parameters important for the lifetime. ZWICK ZHU 2.5 was used for a measurement of the universal hardness of the surface and values of graphs of microhardness were obtained by the device LM 247AT LECO from a cross-section of samples. The coefficient of friction was determined by Bruker CERT-UMT-3 with a ball-on-disc method. The parameters of wear paths were obtained by Talysurf CLI 1000. After the application of plasma nitriding technology, the hardness of both steels was rapidly increased in comparison with non-nitrided samples. According to the comparison of coefficients of friction with respect to the parameters of the measurement, the coefficient of friction of nitrided samples decreases with increasing temperature, which is essential knowledge for the weapon industry, especially the construction of bore barrel.

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“…Dimensional and shape changes depend on many factors. These are material factors, such as the state after casting and homogeneity, the state after annealing (grain size) and also hardenability, as well as structural factors (18). Various requirements are placed on the design of the component, which cannot always be taken into account in the design in terms of low deformation behavior.…”

Section: Introductionmentioning

confidence: 99%

Change of Geometric Accuracy of Structural Steels after Carburizing in Gas

Dobrocký¹,

Pokorny²,

Joska³

et al. 2020

ECS Trans.

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Nowadays, carburizing at low pressure or vacuum carburizing is often used, which is a modification of carburizing in gas, while carburization is performed at pressures well below the level of atmospheric pressure (101 kPa). The advantage of this process is that no internal oxidation occurs; carburizing has a higher rate and uniformity of carburization, good reproducibility of the process and lower deformation. Carburizing is mainly used for parts subjected to abrasion (eg gears). However, even with this process, the geometric accuracy and surface texture of the parts change. The changes of geometric accuracy of ground samples from carbon steel C45, low-alloy Mn-Cr carburizing steel 16MnCr5 and medium-alloyed Ni-Cr carburizing steel 14NiCr14, which were vacuum-carburized in a CO/CH4 atmosphere, were evaluated in this work. Geometric accuracy was evaluated by measurement using a 3D coordinate measuring machine, surface texture using a coherent correlation interferometer. After the carburizing process, changes in the dimensions of the samples were found in all steels. For C45 steel, the sample dimensions were reduced by 0.028 mm ± 0.004 mm, the surface roughness expressed by the parameter Ra decreased by 0.28 µm, which is 20%. In case of carburizing steels there was an increase in the dimensions of the samples, especially in the case of 14NiCr14 steel and a smaller difference in surface roughness. The same parameters of the carburizing process lead to different behaviour of carburized parts in different steels, in terms of changes in dimensions and surface texture.

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Changes of the Surface Texture after Surface Treatment HS6-5-2-5 Steel

Cited by 9 publications

References 5 publications

Effect of Boron and Vanadium Addition on Friction-Wear Properties of the Coating AlCrN for Special Applications

Effect of Boron and Vanadium Addition on Friction-Wear Properties of the Coating AlCrN for Special Applications

Service Behavior of Nitride Layers of Steels for Military Applications

Change of Geometric Accuracy of Structural Steels after Carburizing in Gas

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