Microstructure, Growth Kinetics, and Abrasive Wear Resistance of Boride Layers on Fe–30% Cr Alloy

Dybkov, V. I.; Sidorko, V. R.; Goncharuk, L. V.; Khoruzha, V. G.; Samelyuk, A. V.

doi:10.1007/s11106-013-9463-4

Cited by 16 publications

(14 citation statements)

References 22 publications

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“…The sawtooth-like microstructure of the boride layer on the low-carbon steel was a product of the diffusion process, which resulted in strongly anisotropic growth in which the preferential growth of the Fe 2 B phase occurred in the [001] crystallographic direction [12]. Several studies have established that the orientation of the grains within a boride layer on a polycrystalline substrate seems to be mainly determined by growth kinetics rather than the grain orientation of the substrate material [38][39][40].…”

Section: Microstructurementioning

confidence: 99%

A Stochastic Model and Investigation into the Probability Distribution of the Thickness of Boride Layers Formed on Low-Carbon Steel

et al. 2019

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The stochastic nature of the thickness of boride layers formed on carbon steel is described in this paper. Additionally, the probability distribution of the layer thickness is studied to determine the best-fit probability distribution. The study combines the use of an empirical model (power-law) and the Markov chain principles, with the purpose of demonstrating that it is feasible to develop a model that represents the non-uniformity of the thickness of boride layers that form on carbon steel. The results indicate that the mean and variance tend to increase when the time or temperature is increased. The findings of this paper demonstrate that an analytical solution to the Kolmogorov’s system differential equation can adequately represent the behavior of non-uniform boride layer formed on low-carbon steel, regardless of the temperature or duration of treatment.

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Section: Microstructurementioning

confidence: 99%

A Stochastic Model and Investigation into the Probability Distribution of the Thickness of Boride Layers Formed on Low-Carbon Steel

et al. 2019

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“…Its value for the outer FeB layer is 18 times greater than that for the alloy base. [27,29]. It is seen that increase in chromium content of the alloys from 5 to 30% leads to ~17% increase in the microhardness of boride layers formed on the samples.…”

Section: Microhardness and Abrasive Wear Resistance Of Boride Phases mentioning

confidence: 93%

“…For comparison, Table 6 also shows data for the previously examined alloys with 15 and 30% Cr [27,29]. These values relate to the outer FeB layer.…”

Section: Microhardness and Abrasive Wear Resistance Of Boride Phases mentioning

confidence: 99%

Thermochemical Boriding of Fe–5% Cr Alloy

Dybkov

2016

Powder Metall Met Ceram

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Boriding of the Fe-5% Cr alloy in amorphous boron powder with KBF 4 as an activator at 850-950°C and reaction times of 3600-28800 sec results in the formation of two boride layers at the interface between the reagents. The outer layer bordering boron consists of the FeB phase, while the inner one adjacent to the alloy base consists of the Fe 2 B phase. The average chromium content of the FeB layer is 4.2 wt.% (2.7 at.%) and of the Fe 2 B layer is 4.5 wt.% (3.5 at.%). The formation of boride layers is sequential, rather than simultaneous. The Fe 2 B layer forms and grows first. The FeB layer does not show up until Fe 2 B reaches a necessary minimum thickness exceeding 100 µm, for example, at 850°C. The characteristic feature of both layers is a profound texture. Their diffusional growth kinetics is close to parabolic, x 2 = 2k 1 t. The temperature dependence for the growth rate constant of the Fe 2 B layer in the time range 3600-14400 sec, when the FeB layer still has not formed between boron and Fe 2 B, is described by an Arrhenius relation, k 1 = 7.00  10 -6 exp(-135.0 kJ   mol -1 /RT). The microhardness is 15.6 GPa for the FeB layer, 13.0 GPa for the Fe 2 B layer, and 0.87 GPa for the alloy base. The dry abrasive wear resistance of borided Fe-5% Cr alloy samples found from weight loss measurements is more than one order of magnitude greater than that of their base. Surface boride coatings may be employed in manufacturing products, parts, and materials for functional applications to enhance their service characteristics.

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“…Çelik içerisinde bulunan Mo, Si, Ni, C, Ti, V ve Cr gibi alaşım elementlerinin borlama sonunda elde edilen kaplamaya etkisi özellikle son yıllarda araştırma konusu olmuştur [3]- [5], [9]- [13]. Bu kapsamda çelik için en önemli alaşım elementlerinden olan kromun borlama üzerine yalın etkisinin belirlenmesi için saf demir içerisine atomik olarak %5, 10, 15, 25 ve 30 oranlarında krom ilave edilerek Fe-Cr ikili alaşımları borlanmıştır [12]- [15]. Yapılan bu çalışmalarda Fe-Cr içerisindeki krom miktarındaki artışa bağlı olarak borür tabaka kalınlığının düştüğü, malzeme yüzeyinde oluşan borür tabakanın dış kısmı FeB fazından, iç kısmı ise Fe2B fazından oluştuğu ve buna ek olarak borür tabakası içerisinde ve kaplama-altlık ara yüzeyinde (Fe,Cr)B yapısında iğnemsi yapıların varlığı raporlanmıştır [12]- [14].…”

Section: Introductionunclassified

Boronizing of equiatomic Fe-Cr binary alloy

Tarakçı¹

2017

Pamukkale J Eng Sci

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Microstructure, Growth Kinetics, and Abrasive Wear Resistance of Boride Layers on Fe–30% Cr Alloy

Cited by 16 publications

References 22 publications

A Stochastic Model and Investigation into the Probability Distribution of the Thickness of Boride Layers Formed on Low-Carbon Steel

A Stochastic Model and Investigation into the Probability Distribution of the Thickness of Boride Layers Formed on Low-Carbon Steel

Thermochemical Boriding of Fe–5% Cr Alloy

Boronizing of equiatomic Fe-Cr binary alloy

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