Effect of Chromium Content on Microstructure, Hardness, and Wear Resistance of As-Cast Fe-Cr-B Alloy

Tian, Yuan; Ju, Jiang; Fu, Hanguang; Lin, Jian; Liu, Yongping

doi:10.1007/s11665-019-04369-5

Cited by 27 publications

(12 citation statements)

References 21 publications

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“…The smaller the CPE 1 , the fewer the number of surface defects of the passive film. The lower the CPE 2 , the stronger the protection of the passive film [ 16 , 17 ]. It can be seen from Table 6 that the CPE 1 and CPE 2 values of surfacing layers with different boron additions are very small, which indicates that their passive films are very stable.…”

Section: Resultsmentioning

confidence: 99%

Effect of B on Microstructure and Properties of Surfacing Layer of Austenitic Stainless Steel Flux Cored Wire

Guo

Zhengjun

2022

Materials

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In order to study the effect of element B on the corrosion resistance of stainless steel-based flux cored wire surfacing alloy, a stainless steel surfacing layer was prepared on the surface of carbon steel plate by melt electrode gas shielded welding, and then the microstructure, electrochemical corrosion resistance, and wear resistance of the surfacing layer were analyzed. The results show that the surfacing layer of surfacing alloy presents M2B and Fe3(C, B) phases based on austenite. Boride formed in deposited metal has good corrosion resistance. Therefore, adding the proper amount of B can significantly improve the corrosion resistance of the surfacing layer. When the boron content is 2%, the corrosion resistance is the best. The minimum self-corrosion current density is 1.75766 × 10−11 mA·cm2, and the maximum self-corrosion potential is −0.254438 V. Maximum impedance curve radius. At this time, the wear resistance of the surfacing layer is also the best.

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Section: Resultsmentioning

confidence: 99%

Effect of B on Microstructure and Properties of Surfacing Layer of Austenitic Stainless Steel Flux Cored Wire

Guo

Zhengjun

2022

Materials

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“…AISI 1010 altlık malzemenin Rockwell B skalasında ölçülen sertlik değeri 63 HRB'dir. Bu sonuçların literatürde yapılan benzer sonuçlar ile uyum içerisinde olduğu tespit edilmiştir [32,[34][35][36]. Gerçekleştirilen Fe-Cr-B esaslı sert yüzey alaşımlama işlemi ile malzemelerin yüzey sertlik değerleri büyük oranda arttığı söylenebilir.…”

Section: Aşınma Ve Sertlik (Wear and Hardness)unclassified

Krom içeriğinin Fe(18-x)CrxB2 (X=3,4,5) sert dolgu elektrotunda mikroyapı, aşınma ve korozyon davranışı üzerindeki etkisi

Kocaman

Kılınç²,

Şen

et al. 2020

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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 Coatings of Fe(18-x)CrxB2 (x=3,4,5) based hardfacing electrodes on steel substrate.  Microstructural development of coatings formed on steel surface.  Hardness, wear and corrosion behavior of coatings depending on chromium ratio. Figure A. Schematic illustration of coating process Purpose: The aim of this study is to investigate the effect of chromium content on coating carried out with Fe(18-x)CrxB2 (x=3,4,5) hardfacing electrode. Theory and Methods:Electrode cover composition was prepared with ferro-chromium, ferro-bor and various flux components as starting material. Then the mixed powders were compressed in a mold to form electrode and dried a certain period. The coating on to an AISI 1010 steel surface was carried out by using these electrodes. The coating samples were prepared according to standard metallographic operations and The microstructure, hardness, wear and corrosion behavior of coating was investigated. Results:For each sample, the average coating layer thickness ranged from 4 to 6 mm and has a smooth surface and porosity free topography. It has been determined that a-(Fe-Cr) phase and eutectic phases in coatings which were carried out according to changing chrome ratio. In the coating containing 15% chromium, primary eutectic (a-Fe,Cr)+orthorhombic (Cr,Fe)2B structure surrounded by secondary eutectic (a-(Fe,Cr)+tetragonal (Fe,Cr)2B phase and ın the coating containing 20% and 25% chromium, primary eutectic (a-Fe,Cr) surrounded by chromium-rich boride (α-(Fe,Cr)+ortorombik (Cr,Fe)2B) were observed. X-ray diffraction analysis shows that the system includes -(Fe,Cr)+orthorhombic (Cr,Fe)2B phases as well as tetragonal (Cr,Fe)2B and (Fe,Cr)3(C,B) phases. Hardness values were measured as 65 (+/-0.4) HRC, 65.3 HRC (+/-0.3) and 67.5 HRC (+/-0.5), respectively, according to the increasing chromium ratio. The lowest wear rate was found 2.32x10 -5 (mm 3 /m) in 3N load for the electrode with the Fe13Cr5B2 composition and the highest value was found to be 8.16x10 -5 (mm 3 /m) for electrode with Fe15Cr3B2 composition at 9N load. In addition, the Icor value decreased according to the increasing amount of chromium and was measured as 2.166 µA/cm 2 and 1.615 µA/cm 2 and 1.242 µA/cm 2 , respectively. It was determined that the Ecor value increased with increasing chrome ratio and reached -473.991 mV, -450.056 mV and -347.157 mV respectively. Conclusion:Due to the increase in the chromium ratio in the coating layers, the amount of boride in the eutectic structure, which causes better mechanical and metallurgical properties, has increased. Accordingly, with the increase of Cr ratio in the coating layer, hardness values increased and wear rate values decreased. In addition, the corrosion resistance of the coatings increased with the increase of Cr ratio.

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“…The pearlite hardness is dramatically higher than ferrite. For example, in the Fe-Cr-B alloy, the hardness of pearlite and ferrite is 290-330 HV [20] and 160-220 HV [21], respectively. Meanwhile, the pearlite hardness was mainly controlled by interlamellar spacing [22].…”

Section: Microstructure Effects On Mechanical Propertiesmentioning

confidence: 99%

Effects of Microstructure, Mechanical and Physical Properties on Machinability of Graphite Cast Irons

Ren

Li³

et al. 2020

Metals

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Flake (FGI) and spheroidal (SGI) graphite cast irons are often used to produce workpieces, which often need to be machined. Machinability differences under various machining methods are the basis for choosing machining equipment and technology. In this work, FGI and SGI were used to produce tractor front brackets, and the machinability of both materials under turning and drilling processes was compared. The machinability (turning and drilling ability) has been evaluated in terms of machining load, chips shape, surface roughness, and tool temperature. The influence of materials microstructure and thermal conductivity on the machinability was analyzed. In the turning process, the cutting force and its standard deviation of the FGI were larger than the SGI due to the higher volume fraction of pearlite. The surface roughness was similar in both materials. In the drilling process, the even action of the friction and cutting force on the bit turned into similar drilling loads for both materials. Higher friction and lower thermal conductivity caused a higher bit temperature in SGI drilling compared to FGI. The chip breaking was worse in SGI drilling, where the longer chips scratched the internal surface of the holes, resulting in the higher surface roughness.

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Effect of Chromium Content on Microstructure, Hardness, and Wear Resistance of As-Cast Fe-Cr-B Alloy

Cited by 27 publications

References 21 publications

Effect of B on Microstructure and Properties of Surfacing Layer of Austenitic Stainless Steel Flux Cored Wire

Effect of B on Microstructure and Properties of Surfacing Layer of Austenitic Stainless Steel Flux Cored Wire

Krom içeriğinin Fe(18-x)CrxB2 (X=3,4,5) sert dolgu elektrotunda mikroyapı, aşınma ve korozyon davranışı üzerindeki etkisi

Effects of Microstructure, Mechanical and Physical Properties on Machinability of Graphite Cast Irons

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