Evaluating the mechanical behavior of electrochemically borided low-carbon steel

Sireli, Guldem Kartal; Bora, Asli Su; Timur, Servet

doi:10.1016/j.surfcoat.2019.125177

Cited by 13 publications

(12 citation statements)

References 35 publications

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“…In the boronizing temperature range, most negative value of Δ G for reaction (5) suggests that boronizing is initiated by nucleation of Fe 2 B phase, followed by the growth of FeB/nucleation of CrB, because the values of Δ G are comparable for FeB and CrB [20]. However, XRD patterns for both MSS show that at boronizing temperature of 900°C only iron borides are formed.…”

Section: Resultsmentioning

confidence: 99%

Microstructural evolution and mechanical behaviour of boronized martensitic stainless steels

Mohan

Chaudhari

2022

Surface Engineering

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13Cr-4Ni and 16Cr-5Ni martensitic stainless steels are boronized at 900°C, 950°C and 1000°C for 2, 4, 6, 8 h using powder pack boronizing followed by tempering at 600°C for 2 h. Boronized layer morphology, composition and case depth are studied using optical microscopy, XRD, XPS and SEM. The influence of temperature and duration of boronizing on the growth kinetics of boronized layer is studied. Higher alloy content of 16Cr-5Ni MSS resulted in higher activation energy of boronizing, limiting the attainable case depth. Higher boronizing temperatures produced additional borides besides iron borides that increased hardness and decreased ductility, strain energy density and fracture toughness. Identified boronizing parameters could be useful in enhancing the performance of these grades in hydraulic machinery.

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Section: Resultsmentioning

confidence: 99%

Microstructural evolution and mechanical behaviour of boronized martensitic stainless steels

Mohan

Chaudhari

2022

Surface Engineering

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“…The above results show that the growth rate of boronized layer is strongly dependent on time and current. [21,26] A boronized layer with thickness of about 50 μm can be formed after 45 min of electrochemical boronizing, which shows a more efficient boronizing rate than the powder-pack boronizing.…”

Section: Characterization Of Boronized Layermentioning

confidence: 99%

“…The most effective way to reduce the wear failure is to improve the surface hardness. Boronizing [19][20][21][22][23][24][25] is a highly effective surface modification method that can endow an alloy with high surface hardness, excellent wear resistance, and remarkable mechanical properties. Hou et al [23,24] prepared a boronized layer with a thickness of 50 μm on the surface of Al 0.25 CoCrFeNi HEA using powder-pack boronizing for 9 h. The main boride phases in the boronized layer were (Ni,Co, Fe) 2 B and CrB.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characterization and Robust Lubrication Performance of CoCrNi Medium Entropy Alloy with Advanced Electrochemical Boronizing Treatment

Feng,

Wu,

et al. 2023

Adv Eng Mater

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CoCrNi medium entropy alloy (MEA) is a promising material for aviation and aerospace applications due to its excellent strength and ductility. However, its low surface hardness and poor wear resistance pose challenges for its tribological performance. To address this issue, electrochemical boronizing was explored as a potential solution, offering advantages such as a fast boronizing rate and low cost. This study demonstrated that electrochemical boronizing can significantly enhance the surface hardness and self‐lubrication performance of CoCrNi MEA, as well as retaining the impressive mechanical performance. Results show that a boronized layer with thickness of about 50 μm is formed on the surface in 45 minutes. The boronized layer is mainly composed of Co2B, Ni2B, CrB, CoB and Ni3B. After boronizing, the surface hardness of the sample increases by about 9 times, the ultimate tensile strength and uniform elongation could reach 97% and 73% to these of the original sample, respectively. Compared with the original alloy, the friction coefficient and wear rate of boronized MEA are reduced by 38% and 85% under deionized water condition, respectively. X‐ray Photoelectron Spectroscopy (XPS) analysis reveals the generation of boron‐containing tribofilm on the wear scars, which significantly reduces friction and wear during the friction process.This article is protected by copyright. All rights reserved.

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“…According to the level of cracking and coating delamination, the indentation rating is classified from HF1 to HF6 in the VDI-3198 standard [27], as presented in Figure 8b. Only indentations classified as HF1 and HF2 correspond to superior adhesion [28,29]. Based on the standard, the indentation rating of the as-prepared layer was evaluated to be HF2, indicating the superior adhesion strength of the produced layer with the bainite matrix.…”

Section: Evaluation Of Adhesion Strength and Hardness Profilesmentioning

confidence: 99%

“…Based on the standard, the indentation rating of the as-prepared layer was evaluated to be HF2, indicating the superior adhesion strength of the produced layer with the bainite matrix. It is known that the disadvantage of mere boriding is the large brittleness and ease of flaking off with deformation, especially with a longer boriding duration [28]. Hence, tempering processes are normally conducted to reduce the brittleness and raise the adhesive strength between the borided layer and the matrix.…”

Section: Evaluation Of Adhesion Strength and Hardness Profilesmentioning

confidence: 99%

The Corrosion and Wear Behaviors of a Medium-Carbon Bainitic Steel Treated by Boro-Austempering Process

Liu

Wang²,

et al. 2021

Metals

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The effects of boro-austempering treatment on growth kinetics of borided layers, microstructure, and properties in a medium-carbon bainitic steel were investigated. The microstructure, distribution in coatings, corrosion, and wear properties of boro-austempered steels were characterized by a microscope, field-emission electron probe micro analyzer, scanning vibrating electrode technique system and wear resistance machine. The results show that the corrosion resistance of steels in different corrosive mediums was significantly enhanced by boro-austempering treatment. In addition, the wear performance of borided layers was improved by more than two times compared to bainitic substrates, proving a better wear property of samples treated through the boro-austempering route. The solubility of carbon and silicon in borides is very little. In addition, the dual-phase coating of FeB and Fe2B was observed, and the internal stress induced during the growth of Fe2B and FeB was almost eliminated. The preferential crystallographic growth directions of Fe2B and FeB are [001] and [010], respectively, which belongs to the (100) plane. Finally, the kinetics equation d2 = 0.125·t of the borided layers at 1223 K was established.

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Evaluating the mechanical behavior of electrochemically borided low-carbon steel

Cited by 13 publications

References 35 publications

Microstructural evolution and mechanical behaviour of boronized martensitic stainless steels

Microstructural evolution and mechanical behaviour of boronized martensitic stainless steels

Microstructure Characterization and Robust Lubrication Performance of CoCrNi Medium Entropy Alloy with Advanced Electrochemical Boronizing Treatment

The Corrosion and Wear Behaviors of a Medium-Carbon Bainitic Steel Treated by Boro-Austempering Process

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