The Influence of Boroaluminizing Temperature on Microstructure and Wear Resistance in Low-Carbon Steels

Mishigdorzhiyn, Undrakh; Sizov, I. G.

doi:10.1520/mpc20170074

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…XRD analysis of H21 steel after TCT at 1050°С revealed the presence of FeB, Fe3Al, Fe7W6, Fe2O3 [10]. The presence of iron boride and aluminide is natural for TCT in pastes based on boron carbide [7,8]. The presence of Fe7W6 is unlikely.…”

Section: Resultsmentioning

confidence: 97%

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Electron-Beam Surface Modification of Boron-Based Diffusion Layers Obtained of the Surface of Steel H21

Mishigdorzhiyn¹,

Ulakhanov

Семенов³

2021

Heat Treat 2021: Extended Abstracts From the 31st Heat Treating Society Conference and Exposition

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In recent years the interest in the development of new protective coatings with improved functional properties for machine parts’ surface have been of great fundamental and applied importance. The current study is devoted to the creation of coatings based on boron and aluminium on the surface of alloy steel using a cutting-edge method, combining thermal-chemical treatment (TCT) and subsequent electron beam processing (EBP). TCT was carried out in treatment pastes based on boron carbide and aluminum at 950°C and 1050°C for 2 hours. As a result of processing, diffusion layers with a thickness of up to 120 μm and 580 μm were formed on the steel surface after TCT at 950°C and 1050°C respectively. The subsequent EBP led to a complete transformation of the primary diffusion layer and an increase in its thickness to 1.6 mm. XRD analysis showed significant differences in composition before and after EBP: new compound, such as tungsten borides (WB, W2B9) and iron boride (Fe2B) were detected. In addition, it was determined that the distribution of microhardness and elemental composition (B, Al, W) over the layer thickness after EBP had a more favorable profile without significant fluctuations compared to the sample after TCT. The concentration of Al decreased significantly after EBP. It dropped from 18% after TCT to a low of 1%.

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Section: Resultsmentioning

confidence: 97%

“…First, the process of diffusion boroaluminizing was carried out in pastes containing powders of boron carbide, aluminum, and sodium fluoride as an activator (80% B4C + 16.3% Al + 3.7% NaF). Two TCT temperature modes were at 950°С and 1050°С for 2 hours [7,8]. 2.…”

Section: Experimental Methodsmentioning

confidence: 99%

Electron-Beam Surface Modification of Boron-Based Diffusion Layers Obtained of the Surface of Steel H21

Mishigdorzhiyn¹,

Ulakhanov

Семенов³

2021

Heat Treat 2021: Extended Abstracts From the 31st Heat Treating Society Conference and Exposition

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“…At the same time, there were no oxygen traces detected in the inferior zones. Aluminum nitride formed on the surface of the layer as a product of aluminum reaction with atmospheric nitrogen [30,31]. The hard phases in the upper Zone 1 are represented by iron boride FeB, alloyed with Al, W, Cr, and V. Unlike pure boride layer, the crystal growth of iron boride in the (001) direction was changed after two-component TCT.…”

Section: Resultsmentioning

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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“…Boroaluminizing method is used for the same purposes. Joint saturation of the surface of machine parts and tools with boron and aluminum makes it possible to obtain layers with high resistance in an oxidizing medium, at high temperatures and high wear resistance [8,9]. Boronickelizing is used to increase the wear and corrosion resistance of the surface of carbon steels [10].…”

Section: Introductionmentioning

confidence: 99%

Fe-Me-B Diffusion Layers for Surface Modification of Carbon Steels

Mishigdorzhiyn

Samaev

Мосоров

et al. 2020

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Multicomponent boron-based diffusion layers are capable to provide a wider variety of surface improvements compared to pure boriding. In this research, we consider a way to increase mechanical properties of carbon steels by using two-component thermal-chemical treatment (TCT) such as boroaluminizing (B+Al), and boronickelizing (B+Ni). Diffusion treatment of steel surface was carried out by pack method in powder mixtures, and pastes, containing the above-mentioned elements and sodium fluoride as an activator. The exposure time was 3 hours, the treatment temperature was 950 °C. Pure boriding was conducted additionally to compare with two-component methods. The metallographic analysis revealed diffusion layers with a tooth-like structure after boriding and B+Ni. Typical composition of boride layer with iron boride FeB as an outer phase and Fe2B as an inner one was obtained after the first method. EDS analysis revealed a small amount of Ni (less than 1%) in boronickelized layer. Although XRD analysis revealed Ni2B, Fe3Ni3B besides iron borides and carboborides after B+Ni. Another structure was obtained after B+Al – namely a layered microstructure with outer softer iron aluminides and iron borides beneath. The thickest layer was obtained after boriding with the thickness of 140-160 μm, where higher value corresponds to low-carbon steel and vice versa. While for boroaluminizing the layer thickness was around 120-140 μm and for boronickelizing - 60-100 μm. Microhardness profiles differ significantly depending on the TCT method. For instance, initial high values followed by a drastic drop of hardness for boriding and boronickelizing. Wave type profiles characterize the microhardness distribution on boroaluminized samples. Wear tests indicated that samples with boride layer were the most wear resistant and the least resistant were the samples after B+Al. Fe-Me-B layers with the tooth-like structure are superior to the ones with the layered structure.

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The Influence of Boroaluminizing Temperature on Microstructure and Wear Resistance in Low-Carbon Steels

Cited by 8 publications

References 18 publications

Electron-Beam Surface Modification of Boron-Based Diffusion Layers Obtained of the Surface of Steel H21

Electron-Beam Surface Modification of Boron-Based Diffusion Layers Obtained of the Surface of Steel H21

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

Fe-Me-B Diffusion Layers for Surface Modification of Carbon Steels

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