The growth of single Fe2B phase on low carbon steel via phase homogenization in electrochemical boriding (PHEB)

Kartal, Gülşah Ekin; Timur, Servet; Sista, V.; Eryilmaz, O. L.; Erdemir, Ali

doi:10.1016/j.surfcoat.2011.08.049

Cited by 72 publications

(21 citation statements)

References 20 publications

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“…The boriding experiments were conducted in a molten salt composed of 90% borax and 10% sodium carbonate at a temperature of 950 • C at a current of 18.4 A and voltage of 1.3 V for 20 min. Detailed descriptions of the boride treatment and equipment can be found in [13][14][15]26,27].…”

Section: Methodsmentioning

confidence: 99%

Boride-Carbon Hybrid Technology for Ultra-Wear and Corrosive Conditions

et al. 2021

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This work discusses a study on a surface treatment for creating extremely durable low-friction, wear and corrosion-resistant surfaces for tribological components in harsh conditions. A duplex surface treatment was developed that combines the advantages of ultra-fast electrochemical boriding with those of hard tetrahedral amorphous carbon coatings. The friction and wear properties of the duplex treatment are compared to the boride-only treatment of AISI 1045 steel, while corrosion and contact fatigue behaviors of the duplex layer are compared to that of the single-layer carbon coating on low carbon steel. The duplex treatment yields wear rates as low as 6 × 10−8 mm3·N−1·m−1 and a coefficient of friction of 0.14 when tested against a steel counter face. The contact fatigue impact tests reveal that the high hardness of 1200 HV0.05 of the borided layer in the duplex treatment leads to higher resistance against indentation but is accompanied by a higher incidence of crack initiation, being in good agreement with the finite-element modeling of nanoindentation results. The duplex coatings exhibit resistance to pinhole corrosion as evidenced by a 3 h exposure to 15% HCl at room temperature.

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Section: Methodsmentioning

confidence: 99%

Boride-Carbon Hybrid Technology for Ultra-Wear and Corrosive Conditions

et al. 2021

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“…Furthermore, the presence of dualphase borides on the surface caused the generation of tensile type thermal stresses on the surface as a result of the difference in thermal expansion coefficients of FeB and Fe 2 B phases. Thus, extensive micro-and macro-cracks can be easily formed in the layers parallel to the surface ( Ref 12,20,24). In this respect, PH step was adapted into CRTD-Bor to eliminate FeB layer.…”

Section: Formation Of a Single Fe 2 B Phase On Aisi 304l Ssmentioning

confidence: 99%

Investigating Growth of Iron Borides with the Formation of Monolithic Fe2B Layer on AISI 304 Stainless Steel via Cathodic Reduction and Thermal Diffusion-Based Boriding

Arslan

Karimzadehkhoei

Sireli

et al. 2021

J. of Materi Eng and Perform

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This study is focused on the determination of the effects of processing time and temperature on the thickness, morphology, and hardness of boride layers grown on AISI 304L stainless steels. For boriding, a new molten salt electrolysis method called as CRTD-Bor (Cathodic Reduction and Thermal Diffusion-based boriding) was chosen due to its fast and green nature. CRTD-Bor of AISI 304L substrates was carried out in a borax-based molten electrolyte at temperatures ranging from 950 to 1050 °C for periods of 15 to 60 min at a constant current density of 200 mA/cm 2 . The x-ray diffraction analyses revealed the mixed iron boride phases including Fe 2 B, FeB. Moreover, cross-sectional scanning electron microscopy examinations confirmed the growth of these phases. Additionally, a phase homogenization (PH) step was adapted into CRTD-Bor to eliminate brittle FeB layer. It was founded that after 70 min of treatment at 1000 °C (15 min of CRTD-Bor + 55 min of PH) it is possible to grow % 40-lm-thick Fe 2 B layer exhibiting 1700 ± 100 HV on the surface with excellent adhesion to the substrate (HF1). Besides, kinetic calculations showed the activation energy (Q) of boride layer growth as 181.45 kJ/mol.

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“…The Fe 2 B layer can be obtained using low-temperature boriding, ultra-fast boriding in molten electrolyte, direct and alternating current field, concentrated energy flows, etc. [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Once the brittleness is reduced, boriding acquires potential to be utilized in dynamically loaded machine parts, for instance, to increase surface durability of dies made of hot-work tool steels, which are widely used in forging, die-casting, bending, among others.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Wear Behavior of Tungsten Hot-Work Steel after Boriding and Boroaluminizing

et al. 2020

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(1) Background: Boron-based diffusion layers possess great application potential in forging and die-casting due to their favorable mechanical and thermophysical properties. This research explores the enhanced wear resistance of tungsten hot-work steel through boriding and boroaluminizing. (2) Methods: Thermal-chemical treatment (TCT) of steel H21 was carried out. Pure boriding was introduced to the substrate through heating a paste of boron carbide and sodium fluoride 1050 °C for two hours. As for boroaluminizing, 16% of aluminum powder was added to the boriding paste. (3) Results: It was shown that boriding resulted in the formation of an FeB/Fe2B layer with a tooth-like structure. A completely different microstructure was revealed after boroaluminizing—namely, diffusion layer with heterogeneous structure, where hard components FeB and Mx (B,C) were displaced in the matrix of softer phases—Fe3Al and α-Fe. In addition, the layer thickness increased from 105 μm to 560 μm (compared to pure boriding). The maximum microhardness values reached 2900 HV0.1 after pure boriding, while for boroaluminizing it was about 2000 HV0.1. (4) Conclusions: It was revealed that the mass loss during wear test reduced by two times after boroaluminizing and 13 times after boriding compared to the hardened sample after five-min testing.

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The growth of single Fe2B phase on low carbon steel via phase homogenization in electrochemical boriding (PHEB)

Cited by 72 publications

References 20 publications

Boride-Carbon Hybrid Technology for Ultra-Wear and Corrosive Conditions

Boride-Carbon Hybrid Technology for Ultra-Wear and Corrosive Conditions

Investigating Growth of Iron Borides with the Formation of Monolithic Fe2B Layer on AISI 304 Stainless Steel via Cathodic Reduction and Thermal Diffusion-Based Boriding

Microstructure and Wear Behavior of Tungsten Hot-Work Steel after Boriding and Boroaluminizing

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