Utilising the principles of FeCO3 scaling for cementation in H2O-CO2(g)-Fe system

Srivastava, Sumit; Snellings, Ruben; Meynen, Vera; Cool, Pegie

doi:10.1016/j.corsci.2020.108613

Cited by 10 publications

(9 citation statements)

References 28 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.…”

mentioning

confidence: 74%

“…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. The diffusing element concentration on the surface depends on the influx of atoms of this element to the surface and the rate of diffusion processes, i.e., removing these atoms into the metal.…”

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confidence: 74%

“…The problem of controlling the diffusion process to obtain certain qualitative characteristics of the hardened layer can be briefly formulated as the problem of ensuring a certainly given distribution of the nitrogen concentration C (x, τ) over the depth of the diffusion layer x from the surface of the product [8].…”

Section: Resultsmentioning

confidence: 99%

“…Cementation is carbon saturation. As shown in [6][7][8], cementation is particularly appropriate for achieving a large depth of steel products' carburization. The disadvantage of this method is the high labor intensity and poor variability of the conditions of carburization.…”

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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%

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confidence: 74%

Section: Resultsmentioning

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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“…Application of this mechanism for co-utilization of SFS and CO2 is the focus of this overview. [53][54][55][56], as well as Fe(0) (to prepare FeCO3-based binder) [11,57,58], etc. Moreover, significant amount of recent fundamental research has focused on preparing CFCB products using ɣ-C2S (dicalcium silicate) [59][60][61].…”

Section: : Barriers To Utilization Of Non-bf Slags As Direct Cement R...mentioning

confidence: 99%

Clinker-free carbonate-bonded (CFCB) products prepared by accelerated carbonation of steel furnace slags: A parametric overview of the process development

Srivastava

Snellings

Cool

2021

Construction and Building Materials

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Siderite-calcite (FeCO3–CaCO3) series cement formation by accelerated carbonation of CO2(g)–H2O–Fe–Ca(OH)2 systems

Srivastava

Snellings

Meynen

et al. 2021

Cement and Concrete Composites

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Utilising the principles of FeCO3 scaling for cementation in H2O-CO2(g)-Fe system

Cited by 10 publications

References 28 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

Clinker-free carbonate-bonded (CFCB) products prepared by accelerated carbonation of steel furnace slags: A parametric overview of the process development

Siderite-calcite (FeCO3–CaCO3) series cement formation by accelerated carbonation of CO2(g)–H2O–Fe–Ca(OH)2 systems

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