Mathematical Modelling of Operating Processes in the Pneumatic Engine of the Car

Leontiev, Dmytro; Voronkov, Oleksandr; Korohodskyi, Volodymyr; Hlushkova, Diana; Никитченко, И. Н.; Teslenko, Eduard; Lykhodii, Oleksandr

doi:10.4271/2020-01-2222

Cited by 12 publications

(5 citation statements)

References 11 publications

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“…Одним із факторів, що впливають на термін експлуатації інструменту гарячого деформування, є температура [12][13][14][15][16][17], зокрема її вплив на процеси в поверхневому та підповерхневому шарах [18][19][20][21][22][23][24][25]:…”

Section: аналіз публікаційunclassified

Influence of structure and phase composition of economically alloyed steels on wear resistance

Hlushkova,

Bagrov,

Volchuk

2023

Bulletin of KhNAHU

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Problem. The paper considers the influence of wear on the formation of a "white band" in metastable austenitic, martensitic-austenitic and secondary hardening steels of the Cr-Mn-Ti system additionally alloyed with Mo, B, V., the influence of the structure and phase composition on the wear resistance of sparing. Goal. Based on the above, the purpose of this work was to study the influence of structure and phase composition on the wear resistance of economically alloyed metastable and secondary hardening steels. Methodology. Surfacing of the studied materials was carried out in copper molds with different rates of forced cooling. Metastable austenitic, martensitic-austenitic and secondary hardening steels of the Cr-Mn-Ti system additionally alloyed with Mo, B, V were studied. Additional alloying of these steels with titanium in an amount of 2...5% contributed to the prevention of spalling along the fusion zone. Near the fusion line there is a base metal zone with a width of 7...15 µm. Results. After testing at the volume temperature of the working part of the specimen ТV=553…573 K in the contact volumes of the deposited metal of the 30Kh2V8F type, broadening of the grain boundaries, shear lines, finer grains compared to the underlying layers were revealed. Outside the zone of plastic deformation, the size of the grains corresponds to their sizes before the start of testing, the grain boundaries are relatively thin. The number and location of carbides observed at X430, X80O magnifications are also similar to the structural characteristics of the deposited metal of the 30Kh2V8F type. Originality. At close values of the contact pressure in the friction pair, the time of formation of a crack of critical length increases with an increase in the effective surface energy γе (including the energy of plastic deformation). Thus, the crack resistance indices (CR, j-integral, δС) and, consequently, the wear resistance of maraging steels are higher than those of metastable and tool steels. Practical value. The crack resistance indices (CR, j-integral, δС) and, consequently, the wear resistance of maraging steels are higher than those of metastable and tool steels. Conclusions. The conducted studies confirm the possibility of the formation of a "white band" both in alloys with a high concentration of elements - austenitizers (Mn, C, Ni), and when alloyed with carbide-forming elements with a relatively low affinity for carbon (V, Mo).

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Section: аналіз публікаційunclassified

Influence of structure and phase composition of economically alloyed steels on wear resistance

Hlushkova,

Bagrov,

Volchuk

2023

Bulletin of KhNAHU

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“…Iron oxides Fe 2 O 3 form a loose film does not prevent the penetration of air oxygen and corrosion. Corrosion resistance of steels is achieved by alloying steels with chromium or chromium and nickel [4]. Corrosionresistant steels can be classified by structural class as ferritic, pearlitic, martensitic and austeniticdepending on the structure after heating the steels in the austenite field and cooling in air [9][10][11][12][13].…”

Section: Problem Overviewmentioning

confidence: 99%

Increasing the Corrosion Resistance of Heat-Resistant Alloys for Parts of Power Equipment

Vahrusheva¹,

Hlushkova²,

Volchuk³

et al. 2022

Problems of Atomic Science and Technology

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For the manufacture of parts and assemblies of the turbopump unit of details of power equipment, welded joints with corrosion resistant steels and heat-resistant alloys are used, requiring various modes heat treatment to achieve the required level of mechanical properties. In the manufacture of parts and assemblies of details of power equipment at the machine-building enterprises of Ukraine, it became necessary to replace semi-finished products. It is necessary to replace sheet products from high-alloy alloys ХН67МВТЮ and 06Х15Н6МВФБ with one alloy with a high complex of physical and mechanical characteristics. In the work, as a replacement for the applied heat-resistant alloys, Inconel 718 alloy welded to 316L steel. Samples of welded joints, processed according to the recommended mode, showed increased corrosion resistance.

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“…From the point of view of the materials and equipment used, the detonation sputtering process is quite simple. The main factors determining the nature of detonation sputtering are the gas mixture, powders, and the trunk of the unit [13,14].…”

Section: Statement Of Basic Materialsmentioning

confidence: 99%

Use of Detonation Sputtering to Increase the Durability of Hydraulic Hammer Critical Parts

Hlushkova¹,

Kyrychenko²,

Bahrov³

et al. 2021

Problems of Atomic Science and Technology

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Currently, the use of new methods of surface strengthening has become relevant to improve the working tool. These methods include detonation sputtering. The purpose of this work was to scientifically substantiate and experimentally confirm the effectiveness of strengthening critical parts of a hydraulic hammer by detonation sputtering. As a result of the study, the effect of detonation sputtering on the wear resistance and mechanical properties of the hydraulic hammer working tool was established, and structural changes in the material during its operation were analyzed. The results of testing parts strengthened with detonation sputtering show that an increase in wear resistance by 1.8 times is achieved compared to the initial state.

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Mathematical Modelling of Operating Processes in the Pneumatic Engine of the Car

Cited by 12 publications

References 11 publications

Influence of structure and phase composition of economically alloyed steels on wear resistance

Influence of structure and phase composition of economically alloyed steels on wear resistance

Increasing the Corrosion Resistance of Heat-Resistant Alloys for Parts of Power Equipment

Use of Detonation Sputtering to Increase the Durability of Hydraulic Hammer Critical Parts

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