Interaction of 25% chromium steel with boron powder

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

doi:10.1007/s11106-011-9360-7

Cited by 7 publications

(7 citation statements)

References 12 publications

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“…Calculations showed this system to provide a good fit to experimental data obtained with iron boride and other compound layers. Full set of appropriate values of diffusional constants k can be found in [40][41][42][43][44][45][46][47][48][49].…”

Section: If the Conditionmentioning

confidence: 99%

“…Experimental data [38][39][40][41][42][43][44][45][46][47][48][49] on the interaction of five iron-chromium alloys (5-30% Cr) and two industrial steels containing 13 and 25% chromium with boron in a mixture of amorphous boron powder and KBF 4 (activator) in the temperature range of 850-950ºC at reaction times up to 43200 s are juxtaposed and discussed together with findings of other researchers in this work.…”

Section: Introductionmentioning

confidence: 99%

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Basics of Formation of Iron Borid e Coatings

Dybkov

2016

J. Miner. Met. Mater. Eng.

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Main features of formation of iron boride layers in surface coatings on iron, its alloys, notably with chromium, and steels are discussed. Those include their microstructure, phase identity, chemical composition, sequence of occurrence, growth kinetics, and dry wear resistance. Two different kinds of layer microstructure (single-phase and twophase) are shown to exist. Boriding of iron-chromium alloys (5-30% Cr) and chromium steels (13 and 25% Cr) at 850-950ºC and reaction times up to 43200 s is found to result in the formation of a surface coating consisting of two boride layers. In the case of Fe-Cr alloys containing 5-15% chromium and a 13% Cr steel, the outer layer bordering the boriding agent consists of the (Fe,Cr)B compound, while the inner one adjacent to the solid substrate consists of the (Fe,Cr)2B compound. Each boride layer is a homogeneous phase. It is a microstructure of the first type. With Fe-Cr alloys containing 25 and 30% chromium and a 25% Cr steel, each of two boride layers consists of two compounds. The outer layer comprises the (Fe,Cr)B and (Cr,Fe)B compounds, while the inner one comprises the (Fe,Cr)2B and (Cr,Fe)2B compounds. It is a microstructure of the second type that was not observed earlier. With Fe-Cr alloys containing 5% and 10% Cr, boriding during 3600 s leads to the formation of a single (Fe,Cr)2B layer. The (Fe,Cr)B layer occurs after the first-formed (Fe,Cr)2B layer has attained a thickness of more than 100 µm. With other alloys and steels, a reaction time of 3600 s is sufficient for both boride layers (Fe,Cr)B and (Fe,Cr)2B to form. Their distinguishing feature is a {002} texture. Boride layers with the microstructure of the second type exhibit a much higher wear resistance than those with the microstructure of the first type. The difference exceeds an order of magnitude.

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Section: If the Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Basics of Formation of Iron Borid e Coatings

Dybkov

2016

J. Miner. Met. Mater. Eng.

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“…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]. Bu çalışmada ise literatürde rapor edilmeyen atomik olarak eşit miktarda Fe ve Cr içeren Fe-Cr ikili alaşımı sentetik olarak üretilmiş, farklı sıcaklılarda aynı sürede yapılan kutu borlama tekniği ile kaplanarak karakterize edilmiş ve bu alaşımın borlama davranışı ortaya çıkarılmıştır.…”

Section: Introductionunclassified

“…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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“…The interaction of Fe-Cr (10,15,25, and 30% Cr) * alloys and commercial 40Kh13 (13% Cr) and 15Kh25T (25% Cr) steels with boron was examined previously, and boride coatings deposited on samples of these materials were tested for wear resistance .…”

Section: Introductionmentioning

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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Interaction of 25% chromium steel with boron powder

Cited by 7 publications

References 12 publications

Basics of Formation of Iron Borid e Coatings

Basics of Formation of Iron Borid e Coatings

Boronizing of equiatomic Fe-Cr binary alloy

Thermochemical Boriding of Fe–5% Cr Alloy

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