Research on the chance of increasing the wear resistance of high-speed steel Using chemical thermal treatment methods

Mei, Shunqi; Guryev, A.M.; Иванов, С. Г.; Лыгденов, Б.Д.; Tsydypov, B; He, Xuehong; Liang, Qin

doi:10.1088/1757-899x/479/1/012055

Cited by 3 publications

(5 citation statements)

References 12 publications

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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: 74%

“…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%

“…Silicification is carried out in powdered mixtures, gas, and liquid media. The silicified layer has high corrosion resistance in ordinary seawater and acid resistance in nitric, sulfuric, and hydrochloric acids [3]. Silicification also increases the heat resistance of steel to 700-750 • C. The disadvantage of silicifying steel is that it is almost impossible to obtain a uniform surface that will not have pores.…”

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confidence: 99%

“…To solve problem (2), using boundary and initial conditions ( 4)-( 6), it is necessary to determine the temperature distribution t (x,τ) over the depth of the diffusion layer from Equation (3).…”

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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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confidence: 74%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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

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“…Multilayer multicomponent coatings with aluminum are particularly interesting [16][17][18]. It can be assumed that in titanium aluminizing and chrome aluminizing, the coatings will combine the heat resistance of aluminum compounds with a hardness of carbides, titanium nitride, and chromium (TiN, TiC, Cr 7 C 3 , and Cr 23 C 6 ) on the surface of carbon steel.…”

Section: Introductionmentioning

confidence: 99%

Composition, Structure, and Properties of Ti, Al, Cr, N, C Multilayer Coatings on AISI W1-7 Alloyed Tool Steel

et al. 2022

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New methods of diffusion metallization of AISI W1-7 steel have been developed. The paper proposes a comparative analysis of the properties and characteristics of AISI W1-7 steel after three methods of chemical heat treatment: diffusion nitriding, nitrogen titration by physical deposition from the gas phase, and diffusion chromium plating with subsequent titanium alloys. The results are presented as a comprehensive analysis of coatings: metallographic, micro-X-ray spectral, X-ray phase, durometric, heat resistance, and wear resistance. It is established that multilayer protective coatings are formed as a result of treatments. It is shown that the coatings consist of carbide and nitride zones, intermetallic, and an Al2O3 layer outside the coating. The coatings have been found to contain barrier layers that prevent aluminum from penetrating the substrate. The maximum microhardness is typical for layers based on titanium carbide—30.3–35.5 GPa and titanium nitride—22.0–22.6 GPa, heat-resistant steels AISI W1-7 at a temperature of 900 °C in 4.2–8.5 times and wear resistance under sliding friction without lubrication up to 5.4 times compared to samples without treatment.

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Kinetics of the formation of a diffusion layer on AISI 1045 steel with simultaneous saturation with boron, chromium and titanium

Лыгденов

Guriev

Иванов

et al. 2021

J. Phys.: Conf. Ser.

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Research has been carried out to determine the kinetics of coating formation on AISI 1045 steel with diffusion saturation with boron, chromium and titanium simultaneously. It was found that the experimental parameters of the thickness of the diffusion layer of borides over time outstrip the calculated values. The diffusion layer has a thickness of 120 μm with a saturation duration of 2.5 h, 155 μm with a saturation duration of 5 h, and 180 μm with a saturation duration of 7.5 h. In addition to studying the kinetics of the formation of a diffusion coating, also studied the distribution of microhardness over the cross section of the diffusion coating. The maximum microhardness of the diffusion coating is observed not on the surface, but at some distance from it. On average, at a depth of 45–60 µm from the surface. In this case, the microhardness on the surface of the diffusion coating, on the contrary, tends to take on a minimum value of about 1800 HV0.1. Such a distribution of microhardness it gives the parts the possibility of minor surface wear.

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Research on the chance of increasing the wear resistance of high-speed steel Using chemical thermal treatment methods

Cited by 3 publications

References 12 publications

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

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

Composition, Structure, and Properties of Ti, Al, Cr, N, C Multilayer Coatings on AISI W1-7 Alloyed Tool Steel

Kinetics of the formation of a diffusion layer on AISI 1045 steel with simultaneous saturation with boron, chromium and titanium

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