Formation and kinetics of FeB/Fe2B layers and diffusion zone at the surface of AISI 316 borided steels

Campos-Silva, I.; Domı́nguez, Mariana; Bravo-Bárcenas, O.; Ruiz, M.A. Doñu; Bravo-Bárcenas, D.; Tapia-Quintero, C.; Jiménez‐Reyes, M.

doi:10.1016/j.surfcoat.2010.06.068

Cited by 121 publications

(82 citation statements)

References 26 publications

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“…After a certain time of incubation τ ≠ 0 as shown in 23,24 , the crystals of the Fe 2 B phase form as needles, growing in the crystallographic direction [0 0 2], parallel to the boron diffusion flow.…”

Section: Incubation Time Calculationmentioning

confidence: 99%

“…The thickness and the quality of boronized layer during a boronizing treatment depend on the chemical composition of the medium in contact with the surface, as well as temperature and duration of treatment 11 . On the theoretical level, there are several studies have been undertaken to study boronizing and several mathematical models have been developed 12,13 . For instance the growth kinetics of borided layers were studied by empirical models based on Fick's laws 14 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Boride Incubation Time During the Formation of Fe2B Phase

2017

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Our present study focuses on the numerical simulation of the boronized layer growth kinetics on the iron substrate of the XC38 steel, the boronizing treatment is performed in a liquid medium composed of borax and silicon carbide. We mainly calculated the incubation time of the boronized layer formation. Aimed at estimating the boronizing treatment kinetics of XC38 steel, we initially used experimental data. The study was conducted to determine the law of borided layers growth and estimate the boron diffusion coefficient in the Fe 2 B layer. The diffusion coefficient obtained from this experiment is:In order to calculate the incubation time of the Fe 2 B layer, we adapted the mathematical model, which is based on the second law of Fick. This model takes into account the thermodynamic properties of the Fe-B phase diagram. The comparison of the results obtained by the simulation with those obtained experimentally verifies the validity of the theoretical study and a good agreement was obtained as well.

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Section: Incubation Time Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Boride Incubation Time During the Formation of Fe2B Phase

2017

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“…1). It has been recognized (Ref 16,17) that the FeB phase growth on the outermost part of the sample because the transformation of Fe 2 B crystals over this zone (in addition to the high-boron potential on the surface). When the treatment times and temperatures are increased, the FeB regions become much deeper, and they grow from compact and oriented Fe 2 B crystals.…”

Section: The Microstructure Of Boride Coatingsmentioning

confidence: 99%

Improving the Adhesion Resistance of the Boride Coatings to AISI 316L Steel Substrate by Diffusion Annealing

Campos-Silva

Bernabé-Molina

Bravo-Bárcenas

et al. 2016

J. of Materi Eng and Perform

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In this study, new results about the practical adhesion resistance of boride coating/substrate system formed at the surface of AISI 316 L steel and improved by means of a diffusion annealing process are presented. First, the boriding of AISI 316 L steel was performed by the powder-pack method at 1173 K with different exposure times (4-8 h). The diffusion annealing process was conducted on the borided steels at 1273 K with 2 h of exposure using a diluent atmosphere of boron powder mixture. The mechanical behavior of the boride coating/substrate system developed by both treatments was established using Vickers and Berkovich tests along the depth of the boride coatings, respectively. Finally, for the entire set of experimental conditions, the scratch tests were performed with a continuously increasing normal force, in which the practical adhesion resistance of the boride coating/substrate system was represented by the critical load. The failure mechanisms developed over the surface of the scratch tracks were analyzed; the FeB-Fe 2 B/substrate system exhibited an adhesive mode, while the Fe 2 B/substrate system obtained by the diffusion annealing process showed predominantly a cohesive failure mode.

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“…To ensure the reproducibility of the measured layer thicknesses, fifty measurements were collected in different sections of the samples of the borided AISI 4140 steel to estimate the Fe 2 B layer thickness, defined as the average value of the long boride teeth. [22][23][24] All the thickness measurements were taken from a fixed reference on the surface of the borided AISI 4140 steel, as illustrated in Figure 4.…”

Section: Microscopical Observations Of Boride Layersmentioning

confidence: 99%

Kinetic study and characterization of borided AISI 4140 steel

Кеддам¹

2015

Mater. Tehnol.

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In the present study, an alternative diffusion model was proposed for analyzing the growth of Fe 2 B layers formed on the AISI 4140 steel during the pack-boriding process. This model was based on solving the mass-balance equations for the Fe 2 B/Fe interface to evaluate boron diffusion coefficients through the Fe 2 B layers in a temperature range of 1123-1273 K. The boride incubation time for the Fe 2 B phase was included in the present model. The suggested model was validated experimentally at a temperature of 1253 K for a treatment time of 5 h. Furthermore, the generated boride layers were analyzed with light microscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction analysis (XRD). In addition, a contour diagram was also proposed as a function of treatment time and temperature. On the basis of our experimental results, the boron activation energy for the AISI 4140 steel was found to be 189.24 kJ mol -1 . Keywords: boriding, incubation time, diffusion model, growth kinetics, activation energy, adherence V tej {tudiji je predlagan alternativni model difuzije za analiziranje rasti Fe 2 B-plasti, ki nastane na jeklu AISI 4140 pri boriranju v {katli. Ta model temelji na re{itvi ena~be ravnote`ja mas na stiku (Fe 2 B/Fe) pri oceni koeficienta difuzije bora skozi Fe 2 B-sloje v temperaturnem obmo~ju 1123-1273 K. Inkubacijski~as borida za Fe 2 B-fazo je bil vklju~en v predstavljeni model. Predlagani model je bil eksperimentalno ocenjen pri temperaturi 1253 K in~asu obdelave 5 h. Poleg tega so bili izdelani sloji analizirani na svetlobnem mikroskopu, z vrsti~nim elektronskim mikroskopom (SEM), energijsko disperzijsko rentgensko spektroskopijo (EDS) in z rentgensko difrakcijsko analizo (XRD). Dodatno je bil predlagan {e konturni diagram kot funkcija~asa obdelave in temperature. Na podlagi eksperimentalnih rezultatov je bilo ugotovljeno, da je aktivacijska energija bora pri jeklu AISI 4140 189,24 kJ mol -1 .

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Formation and kinetics of FeB/Fe2B layers and diffusion zone at the surface of AISI 316 borided steels

Cited by 121 publications

References 26 publications

Effect of Boride Incubation Time During the Formation of Fe2B Phase

Effect of Boride Incubation Time During the Formation of Fe2B Phase

Improving the Adhesion Resistance of the Boride Coatings to AISI 316L Steel Substrate by Diffusion Annealing

Kinetic study and characterization of borided AISI 4140 steel

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