Formation of boride layers at the Fe–10% Cr alloy–boron interface

Dybkov, V. I.; Lengauer, W.; Barmak, K.

doi:10.1016/j.jallcom.2005.02.033

Cited by 80 publications

(39 citation statements)

References 7 publications

(9 reference statements)

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“…Also, according to Campos [5], chromium inhibits the layer growth. In the case of boronizing of high chromium steels, in addition, the FeB-layer tends to form more easily and, as indicated for instance by Dybkov et al [3], Li et al [6], and Oliveira et al [7], it can make up to 50 % of the total compound layer thickness.…”

Section: Introductionmentioning

confidence: 95%

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Nature of phases in boronized H11 hot work tool steel

Jurči¹,

Hudáková²,

Kusý³

2012

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The H11 hot work tool steel was short-time boronized, austenitized, quenched and tempered to a standard core hardness of 47-48 HRC. Microstructure, phase constitution and microhardness of boronized layers were investigated. It was found that the boronizing begins with the formation of α-solid solution, enriched with boron, and continues with the development of firstly the Fe2B-boride compound and finally with the FeB-phase. During the boronizing, carbon atoms are transported from the surface towards the parent material. They are accumulated in a narrow intermediate region beneath the borides, where they develop new carbides. These carbides were identified as M23C6. Their portion probably increases with prolonged boronizing time, which is reflected in higher hardness of intermediate region. Also the hardness of boron compounds was found to be increased slightly with longer processing time.K e y w o r d s : powder boronizing, H11 hot work tool steel, microstructure, phase constitution, borides, carbides

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Section: Introductionmentioning

confidence: 95%

“…Depending on the nature of the substrate material and processing conditions, single phase (Fe 2 B) or double phase (FeB + Fe 2 B) layers can be formed. If the material con-tains a sufficiently high amount of chromium, also the chromium based or complex (Fe, Cr)-borides are formed [2,3]. Carbon is almost completely insoluble in the borides.…”

Section: Introductionmentioning

confidence: 99%

Nature of phases in boronized H11 hot work tool steel

Jurči¹,

Hudáková²,

Kusý³

2012

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“…Boronizing parameters were as follows: 1223 K and 8 h. The annealing process, carried out at 1273 K for 8 h, caused that FeB phase disappeared completely. Furthermore, it was shown by Dybkov et al [40] that annealing of a borided FeCr sample for 6 h also resulted in the disappearance of FeB layer.…”

Section: Fe2b Bmentioning

confidence: 94%

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 VPBD-2S vacuum device employed for boriding steel samples has been described elsewhere [9]. Its experimental cell is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Interaction of 25% chromium steel with boron powder

Dybkov

Sidorko

Khoruzha

et al. 2011

Powder Metall Met Ceram

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Thermochemical treatment of industrial chromium steel in amorphous boron powder in the temperature range 850-950°C and reaction times up to 43200 sec (12 h) results in the formation of two boride layers at the steel-boron interface. The microstructure of the outer layer bordering the boron phase consists of elongated crystals of the (Fe,Cr)B and (Cr,Fe)B compounds, while that of the inner layer adjacent to the steel base consists of elongated crystals of the (Fe,Cr) 2 B and (Cr,Fe) 2 B compounds. Both layers reveal a pronounced texture. Their diffusional growth kinetics is close to parabolic x 2 = 2k 1 t, where x is the total thickness of both layers (m), k 1 is the layer growth-rate constant (m 2 ⋅ sec -1 ), and t is time (sec). The temperature dependence of the growth-rate constant of boride layers on the steel surface is described by a relation of the Arrhenius type k 1 = 1.72 ⋅ 10 -8 exp (-137.1 kJ ⋅ mole -1 /RT). Microhardness values are 17.8 GPa for the outer layer, 15.9 GPa for the inner layer, and 1.70 GPa for the steel base. The dry abrasive wear resistance of borided steel samples is more than 250 times greater than that of non-borided ones.

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Formation of boride layers at the Fe–10% Cr alloy–boron interface

Cited by 80 publications

References 7 publications

Nature of phases in boronized H11 hot work tool steel

Nature of phases in boronized H11 hot work tool steel

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

Interaction of 25% chromium steel with boron powder

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Formation of boride layers at the Fe–10% Cr alloy–boron interface

Cited by 80 publications

References 7 publications

Nature of phases in boronized H11 hot work tool steel

Nature of phases in boronized H11 hot work tool steel

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

Interaction of 25% chromium steel with boron powder

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Product

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