Kinetics of borided 31CrMoV9 and 34CrAlNi7 steels

Efe, G. Çelebi; İpek, M.; Özbek, İ. Yücel; Bindal, C.

doi:10.1016/j.matchar.2006.10.007

Cited by 41 publications

(22 citation statements)

References 10 publications

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“…Moreover, the boride layer thickness and type depend strongly on alloying elements of metallic materials due to they obstruct the diffusion of boron atoms into a substrate [1,2]. Consequently, lower thicknesses, double phases and relatively smooth and more compact morphology are the characteristics of boride layers formed on high alloy steels [11][12][13][14][15]. A SEM-EDS was performed to analyze the concentration of chromium in the boride layer and the transition zone as illustrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

Diffusion kinetics of different boronizing processes on martensitic stainless steel AISI 420

JUIJERM¹

2021

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Martensitic stainless steels are much more considered using in many applications relating high loading and wear. A boride layer on martensitic stainless steel is generally accepted against wear and oxidation occurred during services. Boronizing processes, salt bath and powder pack, were performed on a martensitic stainless steel AISI 420 at a temperature range of 1123-1223 K with boronizing time up to 9 h. Boride layer thicknesses were measured using an optical microscope with an image analyzer program. An X-ray diffraction (XRD) and a scanning electron microscope with energy dispersive X-ray spectroscopy (SEM-EDS) were performed to characterize the boride layers. Kinetics of boronizing processes was analyzed using diffusion and Arrhenius equations. Activation energies and empirical data of the boronizing processes will be determined. It was found that the thicknesses of the boride layers increase with increasing boronizing temperature and time taking into account diffusion theory. Activation energies of 233.5 and 185.2 kJ mol −1 were determined and discussed for martensitic stainless steel AISI 420 boride in a salt bath and powder pack, respectively. Finally, empirical relationships of boride thickness as a function of boronizing temperature and time are presented.

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Section: Resultsmentioning

confidence: 99%

Diffusion kinetics of different boronizing processes on martensitic stainless steel AISI 420

JUIJERM¹

2021

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“…The boride layer thickness changes depending on the boriding time and temperature for both type of furnaces. As a result of the boriding process, boride layer thickness changes depending on the working conditions of the type of furnace and with increasing boriding temperature and time [8,11,19,22]. While, boride layers on the surface of AISI P20 steel ranged from 26 to 143 mm in conventional furnace, and AISI P20 steel ranged from 33 to 158 mm in micro-wave furnace due to better volumetric and uniform heating [23,24].…”

Section: Characterization Of Boride Coatingsmentioning

confidence: 99%

“…The amount of alloy is additions, i.e. number of elements will have a direct result on the thickness of boride layer which is less when the number of elements is more in number and activation energy is higher [3,18,19,30,32].…”

Section: Steelmentioning

confidence: 99%

Investigation of diffusion kinetics of borided AISI P20 steel in micro-wave furnace

Kayalı

2015

Vacuum

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“…Çelikteki Cr bileşimi arttığı zaman çelikte oluşan borür tabakası daha da incelmekte ve matris ile borür tabakası arasındaki ara yüzey gittikçe düzleşmektedir (Özbek vd. 2002, Taktak 2006 (Meriç et al 2000, Efe et al 2008. Cr elementi tercihli olarak demirborür'e girip borlama esnasında yüzeye doğru yarken, aksine Ni tabaka altında konsantre olur ve düşük nikel borürlerin oluşmasına neden olur.…”

Section: Adhezyon Testleriunclassified

Investigation of the Kinetics of Borided AISI 420 and AISI 5140 Steels

Barut¹,

Yavuz²,

Kayalı³

2014

AKU-J. Sci. Eng.

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ÖzetBu çalışmada AISI 5140 ve AISI 420 çelikleri 1123, 1173 ve 1223 K sıcaklıklarında2,4 ve 6 saat süreyle kutu borlama yöntemi ile borlanmıştır. Deneyler sonucunda, çelik yüzeylerinde oluşan borür tabakalarının morfolojisi optik mikroskobu ile incelenmiştir. Sertlik değerleri, mikro-sertlik cihazı ile ölçülmüş ve tabaka üzerinde oluşturulan fazlar XRD yöntemi ile belirlenmiştir. XRD analizinde FeB, Fe 2 B, CrB ve MnB fazlarının borür tabakasının üzerinde oluştuğu görülmüştür. Sonuç olarak, borlanmış çeliklerde elde edilen borür tabakasının kalınlık değerleri, borlama süresi ve sıcaklığın artmasıyla artığı görülmüştür. Buna ek olarak, borür tabakasının kalınlık değerleri çeliklerin kimyasal bileşimine bağlı olarak değişmiştir. AbstractIn this study, AISI 5140 steel and AISI 420 stainless steel were pack borided at 1123, 1173 and 1223 K for retention times of 2, 4 and 6 h. The morphology of the boride layers formed on the steel surfaces as a result of the experiments was investigated by optical microscopy. The hardness values were measured by a micro-hardness device and the phases formed on the layer were determined by the XRD method. The XRD analysis revealed that FeB, Fe 2 B, CrB and MnB phases had formed on the boride layer. The results indicate that the boride layer thickness in all the steel samples had an incres as a function of incresing boriding time and temperature. In addition, the boride layer thickness values changed depending on the chemical composition of the steels. While the original hardness values of AISI 5140 and AISI 420 steels were 265 HV 0,05 and 340 HV 0,05 respectively, as a result of boriding, they increased up to 1843 HV 0,05 and 1972 HV 0,05 . Activation energies (Q) of borided AISI 5140 steel and AISI 420 stainless steel used in the current study were determined as 194.951 and 206.161 kJ/mol, respectively. The growth kinetics of the boride layers forming on the AISI 5140 steel and AISI 420 steels and thickness of boride layers were also investigated. The adhesion properties of the boride layer were analyzed by performing the Daimler-Benz Rockwell-C adhesion method. According to the adhesion test results, the adhesion resistance of the boride layer decreased with the increase in the boriding temperature and time.

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Kinetics of borided 31CrMoV9 and 34CrAlNi7 steels

Cited by 41 publications

References 10 publications

Diffusion kinetics of different boronizing processes on martensitic stainless steel AISI 420

Diffusion kinetics of different boronizing processes on martensitic stainless steel AISI 420

Investigation of diffusion kinetics of borided AISI P20 steel in micro-wave furnace

Investigation of the Kinetics of Borided AISI 420 and AISI 5140 Steels

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