Kinetics and Boron Diffusion in the FeB/Fe2B Layers Formed at the Surface of Borided High-Alloy Steel

Campos-Silva, I.; Domı́nguez, Mariana; Tapia-Quintero, C.; Rodríguez-Castro, G.A.; Jiménez‐Reyes, M.; Chávez‐Gutiérrez, Edwin

doi:10.1007/s11665-011-0088-9

Cited by 71 publications

(47 citation statements)

References 24 publications

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“…So, the (boride layer/ substrate) interface looks to be smooth due to the effect of alloying elements in the matrix [16]. The EDS analysis puts into evidence that chromium can enter into the iron borides lattices to form the complex borides such as (Fe, Cr)2B and (Fe, Cr)B [9][10][11].…”

Section: Discussionmentioning

confidence: 99%

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Diffusion kinetics of boron in the X200CrMoV12 high-alloy steel

Azouani

Кеддам

Brahimi

et al. 2015

J min metall B Metall

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In this work, the kinetics o f the boride layers (FeB/Fe2B), formed on the X200CrMoV12 steel used fo r the cold-working, was investigated. The bonding treatment was carried out in the powder mixture consisting o f 5%B,C, 5% NaBF. and 90% SiC. The bonding parameters are : 900, 950 and 1000°C with treatment times o f 2, 4 and 6 h. The obtained bonded layers (FeB/Fe,B) were characterized by the following experimental techniques: optical microscopy, scanning electron microscopy coupled to EDS analysis and XRD analysis. The kinetics o f boron diffusion in the X200CrMoV12 steel was also studied. As a result, the time dependence o f the bonded layers thicknesses followed a growth parabolic law. The boron activation energy was estimated as 199.37 kJ m ol' for the X200CrMoV12 steel. A full factorial design with 2 factors at 3 levels was employed to estimate the total boride layer thickness as a function o f the bonding parameters (time and temperature) and a simple equation was proposed. Finally, an iso-thickness diagram was given as a tool to predict the total boride layers thicknesses in relation with the practical utilization o f this kind o f steel.

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Section: Discussionmentioning

confidence: 99%

“…The morphology of the (boride layer/substrate) interface is affected by the presence of alloying elements [8][9][10][11]. The (boride layer/substrate) exhibits a saw tooth morphology for Armco iron and carbon steels [12][13][14] whereas this interface tend to be flat in the case of high -alloy steels [15,16].…”

Section: Introductionmentioning

confidence: 99%

Diffusion kinetics of boron in the X200CrMoV12 high-alloy steel

Azouani

Кеддам

Brahimi

et al. 2015

J min metall B Metall

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“…The boride incubation times were deduced for a null boride layer thickness. It was shown that the higher boriding temperatures involve the shorter incubation times [22,27] as shown in Tables I and II. Figure 2 describes the temperature dependence of the two parameters β FeB (T ) and β(T ). It is noticed that these two parameters are linearly dependent on the boriding temperature and can be approximated by Eqs.…”

Section: Fe2b Bmentioning

confidence: 97%

“…where R is the universal gas constant (= 8.314 J/(mol K)), and T represents the absolute temperature in K. The reported values of the activation energies [22,27,29,30,34,36,37] of the borided steels are listed in Table IV together (20) and (21) can be rewritten as follows:…”

Section: Fe2b Bmentioning

confidence: 99%

Determination of the Diffusion Coefficients of Boron in the FeB and Fe₂B Layers Formed on AISI D2 Steel

et al. 2015

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In the present work, a diusion model was applied to estimate the boron diusion coecients in the FeB and Fe2B layers during the pack-boriding of AISI D2 steel in the temperature range of 12231323 K during a variable exposure time between 1 and 8 h. The mass balance equations were formulated at each growing interface by considering the eect of boride incubation times. The estimated values of boron activation energies in the FeB and Fe2B layers were compared with the literature data. Validation of the present model was made by comparing the experimental thickness of each boride layer, taken from the literature data, with the predicted values. In addition, a simple equation was suggested to estimate the required time to obtain a single Fe2B layer by diusion annealing.

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“…The boriding of ferrous materials causes the formation of either a single layer (Fe2B) or double-layer (FeB/Fe 2 B) with a definite composition. The thickness of the layer formed (which is known as the case depth) influences the mechanical and chemical behaviors of the borided steels that depends on the boriding temperature, the treatment time and the boron potential that surrounds the sample surface [8]. When the treatment time and temperature are increased, the FeB regions become much deeper, and they grow from compact and oriented Fe 2 B crystals.…”

Section: Introductionmentioning

confidence: 99%

Research of structure and properties of boride hardening coatings

Дмитриев¹,

Sagalakov²,

Grigor'ev³

et al. 2018

Proceedings of the International Conference "Aviamechanical Engineering and Transport" (AVENT 2018)

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Strengthening of parts and units of machines, increased reliability and longer service life are an important task of modern aerospace industry. As promising materials for protective-strengthening coatings, matrix composites based on ternary system Fe-B-FenB are offered. The aim of the research was to apply boride coatings on the surface of steel parts. Relevance is conditioned by the necessity to harden the surface of steel used in high-load conditions. Samples of coatings on 65 G grade steel, applied by HFC-heating, were obtained. Research of samples with different coatings studied using the metallurgical microscope was carried out. Research data on samples with different coatings applied by means of an eddy current measuring system were obtained and conclusion on electrical conductivity distribution along the sample surface depending on flux quantitative content during boriding was made.

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Kinetics and Boron Diffusion in the FeB/Fe2B Layers Formed at the Surface of Borided High-Alloy Steel

Cited by 71 publications

References 24 publications

Diffusion kinetics of boron in the X200CrMoV12 high-alloy steel

Diffusion kinetics of boron in the X200CrMoV12 high-alloy steel

Determination of the Diffusion Coefficients of Boron in the FeB and Fe₂B Layers Formed on AISI D2 Steel

Research of structure and properties of boride hardening coatings

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Kinetics and Boron Diffusion in the FeB/Fe2B Layers Formed at the Surface of Borided High-Alloy Steel

Cited by 71 publications

References 24 publications

Diffusion kinetics of boron in the X200CrMoV12 high-alloy steel

Diffusion kinetics of boron in the X200CrMoV12 high-alloy steel

Determination of the Diffusion Coefficients of Boron in the FeB and Fe2B Layers Formed on AISI D2 Steel

Research of structure and properties of boride hardening coatings

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Determination of the Diffusion Coefficients of Boron in the FeB and Fe₂B Layers Formed on AISI D2 Steel