Formation of Composite Reinforced Coating by Chemical Deposition and Chemical-Thermal Treatment of Boron and Carbon

Stetsko, Andrew E.; Stetsko, Ya. T.

doi:10.1007/978-981-15-1742-6_24

Cited by 3 publications

(4 citation statements)

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“…Therefore, the determining factor for obtaining the necessary depth of the diffusion layer is the temperature. The diffusion layer's depth also depends on the process's duration [1,3,7,8]. As shown in previous works [7,8], the diffusion rate at the penetration of diffusing atoms into the solvent lattice will be higher if solid solutions of introduction are formed during the interaction and much lower if solid solutions of substitution are formed.…”

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confidence: 71%

“…Diffusion in polycrystalline metals is much more intense than in single crystals. This is because diffusion is a structurally dependent process and is largely determined by the presence of defects in the crystal structure of metals [1,20,29]. As shown in these works, all structural defects, vacancies, grain boundaries and sub-boundaries, external surfaces, dislocations, etc., affect the diffusion mobility of atoms.…”

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confidence: 94%

“…Chemical-thermal treatment of metals and their alloys for their surface hardening and protection against surface corrosion increases the reliability and durability of machine parts [1][2][3][4][5]. Parts such as bushings, pipes, washers, screws, gaskets, axles, shafts, gear Processes 2021, 9, 698 2 of 14 shafts, plungers, rods, crankshafts and camshafts, rings, spindles, screws, mandrels, rails, gear rings, semi-axles, gears, hydraulic cylinders, machine tool and turbine parts, as well as tools, punching tools, etc., need surface hardening.…”

Section: Introductionmentioning

confidence: 99%

“…Dissociation [1] is the decomposition of the molecules of the saturating medium to obtain the necessary element in the active atomic (ionized) state.…”

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confidence: 99%

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Simulation of Diffusion Processes in Chemical and Thermal Processing of Machine Parts

et al. 2021

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To solve a number of technological issues, it is advisable to use mathematical modeling, which will allow us to obtain the dependences of the influence of the technological parameters of chemical and thermal treatment processes on forming the depth of the diffusion layers of steels and alloys. The paper presents mathematical modeling of diffusion processes based on the existing chemical and thermal treatment of steel parts. Mathematical modeling is considered on the example of 38Cr2MoAl steel after gas nitriding. The gas nitriding technology was carried out at different temperatures for a duration of 20, 50, and 80 h in the SSHAM-12.12/7 electric furnace. When modeling the diffusion processes of surface hardening of parts in general, providing a specifically given distribution of nitrogen concentration over the diffusion layer’s depth from the product’s surface was solved. The model of the diffusion stage is used under the following assumptions: The diffusion coefficient of the saturating element primarily depends on temperature changes; the metal surface is instantly saturated to equilibrium concentrations with the saturating atmosphere; the surface layer and the entire product are heated unevenly, that is, the product temperature is a function of time and coordinates. Having satisfied the limit, initial, and boundary conditions, the temperature distribution equations over the diffusion layer’s depth were obtained. The final determination of the temperature was solved by an iterative method. Mathematical modeling allowed us to get functional dependencies for calculating the temperature distribution over the depth of the layer and studying the influence of various factors on the body’s temperature state of the body.

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mentioning

confidence: 71%

mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

“…Dissociation [1] is the decomposition of the molecules of the saturating medium to obtain the necessary element in the active atomic (ionized) state.…”

mentioning

confidence: 99%

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