Effect of Boride Incubation Time During the Formation of Fe2B Phase

Mebarek, Bendaoud; Benguelloula, Abdelbasset; Zanoun, A.

doi:10.1590/1980-5373-mr-2017-0647

Cited by 7 publications

(19 citation statements)

References 18 publications

(26 reference statements)

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“…The calculated boron activation energies ranged between 80.70 and 100.16 kJ mol -1 , depending on the value of current density in the range 0.1 -0.4 A cm -2 . It is noticed that these values are lower than those obtained from other reported works 3,12,[21][22][23][24][25][26][27][28] . It should be attributed to the absence of carbon and nitrogen as interstitial atoms leading to the increase in the boron mobility within the material substrate.…”

Section: Methodscontrasting

confidence: 71%

“…The two unknowns α and β which are positive have to be searched for solving this diffusion problem. After substitution of Equations (11), (12) and (13) into the DAE (differential algebraic equations) system and derivation, the expression of boron diffusion coefficient was obtained as follows:…”

Section: The Diffusion Modelmentioning

confidence: 99%

“…Therefore, the expression describing the evolution of boron diffusion coefficients in Fe 2 B versus temperature is given by Equation 17in the temperature range 1123-1273 K: (17) where R = 8.314 J mol -1 K -1 and T the absolute temperature in Kelvin. Table 3 shows a comparison between the values of activation energy for boron diffusion in Armco iron and some ferrous alloys (steels and gray cast iron) and the estimated value of activation energy for boron diffusion in AISI S1 steel 3,12,[21][22][23][24][25][26][27][28] .…”

Section: Estimation Of Boron Activation Energy In Aisi S1 Steelmentioning

confidence: 99%

“…From a kinetic point of view, several approaches have beeen developed to study the kinetics of formation of Fe 2 B layers on Armco iron and steels as substrates [3][4][5][6][7][8][9][10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Formation of Fe2B Layers on AISI S1 Steel

et al. 2018

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In the present work, the AISI S1 steel was pack-borided in the temperature range 1123-1273 K for 2-8 h to form a compact layer of Fe 2 B at the material surface. A recent kinetic approach, based on the integral method, was proposed to estimate the boron diffusion coefficients in the Fe 2 B layers formed on AISI S1 steel in the temperature range 1123-1273 K. In this model, the boron profile concentration in the Fe 2 B layer is described by a polynomial form based on the Goodman's method. As a main result, the value of activation energy for boron diffusion in AISI S1 steel was estimated as 199.15 kJmol-1 by the integral method and compared with the values available in the literature. Three extra boriding conditions were used to extend the validity of the kinetic model based on the integral method as well as other diffusion models. An experimental validation was made by comparing the values of Fe 2 B layers' thicknesses with those predicted by different diffusion models. Finally, an iso-thickness diagram was proposed for describing the evolution of Fe 2 B layer thickness as a function of boriding parameters.

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Section: Methodscontrasting

confidence: 71%

Section: The Diffusion Modelmentioning

confidence: 99%

Section: Estimation Of Boron Activation Energy In Aisi S1 Steelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetics of Formation of Fe2B Layers on AISI S1 Steel

et al. 2018

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“…According to the Iron-Boron equilibrium diagram [6], the diffusion of the boron atoms into the crystalline lattice leads to the formation of two types of iron borides Fe 2 B and FeB [7][8]. The thickness and the quality of boronized layer depend on the chemical composition of boronizing medium, the chemical composition of the treated metal and the treatment duration [3,9].…”

Section: Introductionmentioning

confidence: 99%

Simulation of the incubation time for the formation of (FeB/Fe₂B) bilayer on pure iron

Mebarek

Кеддам

Kulka

2021

Koroze a Ochrana Materialu

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In this work, a mathematical model was used in order to study the growth kinetics of (Fe2B/FeB) bilayer during bori-ding process basing on the second Fick’s law and mass balance equation. The run of the numerical simulation allowed calculating the incubation time (τ) of each boronized layer (Fe2B or FeB), and estimating the effect of this parameter on the growth of the boronized layer. The boride incubation time for forming the FeB or Fe2B layer on the pure iron substrate was incorporated into the present mathematical model. To simulate the value of the growth rate constant and the incubation time for the bilayer configuration, the experimental data available in the literature concerning the boronizing of pure iron were considered. Based on the experimental and simulation results, it was shown that the incubation time decreases with increasing temperature in the FeB and Fe2B phases. It was concluded from this study that the thickness of each boride layer depended on its growth rate constant and on another parameter kτ which was the rate constant of incubation time.The obtained results confirmed the validity of the present mathematical model and gave a good estimate of the incubation time during the formation of each boride layer as well as formulated the variation of this parameter with a mathematical equation. Furthermore, the comparison of experimental data with the simulated results of boronized layer thickness allowed to validate the present model.

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Investigation of Growth Kinetics of Fe₂B Layers on AISI 1518 Steel by the Integral Method

Elías-Espinosa

Кеддам

Domı́nguez

et al. 2018

High Temperature Materials and Processes

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The AISI 1518 steel was pack-borided in the temperature range 1123–1273 K for a treatment ranging from 2 to 8 h. A compact single boride layer (Fe2B) was formed at the surface of the AISI 1518 steel using the mixture of powders composed of 20 % B4C, 10 % KBF4 and 70 % SiC. The following experimental techniques such as scanning electron microscopy coupled with EDS analysis and X-ray diffraction analysis were employed to characterize the pack-borided AISI 1518 steel. An alternative model, based on the integral mass balance equation, was used to estimate the boron diffusion coefficients in the Fe2B layers in the temperature range 1123–1273 K. Finally, the value of activation energy for boron diffusion in the AISI 1518 steel was estimated and compared with the literature data. Furthermore, the present model was validated by comparing the experimental value of Fe2B layer thickness, obtained at 1253 K for 2 h of treatment, with the predicted value.

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Effect of Boride Incubation Time During the Formation of Fe2B Phase

Cited by 7 publications

References 18 publications

Kinetics of Formation of Fe2B Layers on AISI S1 Steel

Kinetics of Formation of Fe2B Layers on AISI S1 Steel

Simulation of the incubation time for the formation of (FeB/Fe₂B) bilayer on pure iron

Investigation of Growth Kinetics of Fe₂B Layers on AISI 1518 Steel by the Integral Method

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Effect of Boride Incubation Time During the Formation of Fe2B Phase

Cited by 7 publications

References 18 publications

Kinetics of Formation of Fe2B Layers on AISI S1 Steel

Kinetics of Formation of Fe2B Layers on AISI S1 Steel

Simulation of the incubation time for the formation of (FeB/Fe2B) bilayer on pure iron

Investigation of Growth Kinetics of Fe2B Layers on AISI 1518 Steel by the Integral Method

Contact Info

Product

Resources

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Simulation of the incubation time for the formation of (FeB/Fe₂B) bilayer on pure iron

Investigation of Growth Kinetics of Fe₂B Layers on AISI 1518 Steel by the Integral Method