Plasticity of Boronized Layers

Krukovich, M. G.; Prusakov, B. A.; Sizov, I. G.

doi:10.1007/978-3-319-40012-9

Cited by 48 publications

(45 citation statements)

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“…The influence of the alloying metals on the plasticity of layers on iron saturated with boron is analyzed in [15]. The following metals: Si, Ni, Mn, Ti, Al, Zr, Cr, and REM decrease their brittleness and increase plasticity.…”

Section: Resultsmentioning

confidence: 99%

Influence of the Crystalline Structure on the Mechanical Properties of Dodecaborides of Rare-Earth Metals and Zirconium

Одінцов

Korin

2016

Mater Sci

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For the first time, we determine the modulus of elasticity (Young's modulus), the shear modulus, and the coefficient of transverse deformation (Poisson's ratio) for hot-pressed dodecaborides by using the basic thermal characteristics of the dodecaborides of rare-earth metals and zirconium YB and the experimental methods of static and dynamic investigations. The numerical and experimental values of the mechanical parameters coincide. The modulus of elasticity of dodecaborides is approximately twice smaller than for pure boron and does not increase, as theoretically predicted, in the sequence MeB 4 → MeB 6 → MeB 12 . This fact can be explained by the structural features of the crystal lattice of dodecaboride phases, the lengths of the B-B, Me-B, and Me-Me bonds, and the forces of interaction between the atoms in these phases.In the contemporary branches of industry (chemistry, metallurgy, machine building, radio electronics, aircraft and spacecraft construction, nuclear and defense technologies), traditional metals and their numerous alloys fail to satisfy new requirements to the chemical stability, density, and physicomechanical properties, especially under the conditions of high mechanical loads, high temperatures, and the action of corrosive media. The scientific progress, as well as the economic and ecological requirements determine, to a significant extent, the properties of structural materials used in manufacturing various types of commercial products. The problem of creation of new classes of structural materials based of rare-earth metals (REM), carbon, silicon, boron, and other elements in the form of carbides, silicides, borides, and compositions of these compounds explains the necessity of profound scientific investigations of the physicochemical and mechanical properties of these materials. It is clear that the dodecaboride phases of REM and zirconium with structures of the UB 12 type definitely belong to the indicated class of materials.The physicochemical properties of these refractory compounds and, especially, their mechanical and strength characteristics are studied insufficiently [1][2][3][4]. Here, it is necessary to mention only the paper [5] in which it is shown that the bending strength of YB 12 is equal to 165 GPа (and the porosity of the specimens sintered in vacuum is 22-26%). In addition, in [2], one can find the computed values of Young's modulus for the dodecaborides of REM.The aim of the present work is to study the principal mechanical properties of cubic dodecaborides with the UB 12 structure, namely, to perform the numerical analysis (by using the well-known formulas) of Young's and

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Section: Resultsmentioning

confidence: 99%

Influence of the Crystalline Structure on the Mechanical Properties of Dodecaborides of Rare-Earth Metals and Zirconium

Одінцов

Korin

2016

Mater Sci

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“…Owning to their characteristics, i.e., high hardness, thermal stability, high wear and corrosion resistance, metal borides are considered a perspective option where the operational conditions demand for improved performance, reliability, safety and increased service life of various engineering components [ 1 ]. For example, the use of metal borides as protective coatings is one technological area of considerable practical importance in the case of both ferrous and non-ferrous alloys [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Third Element on Nano-Mechanical Properties of Iron Borides FeB and Fe2B Formed in Fe-B-X (X = C, Cr, Mn, V, W, Mn + V) Alloys

et al. 2020

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In this study, the influence of alloying elements on the mechanical properties of iron borides FeB and Fe2B formed in Fe-B-X (X = C, Cr, Mn, V, W, Mn + V) alloys were evaluated using instrumented indentation measurement. The microstructural characterization of the alloys was performed by means of X-ray diffraction and scanning electron microscope equipped with an energy dispersive X-ray analyzer. The fraction of the phases present in the alloys was determined either by the lever rule or by image analysis. The hardest and stiffest FeB formed in Fe-B-X (X = C, Cr, Mn) alloys was observed in the Fe-B-Cr alloys, where indentation hardness of HIT = 26.9 ± 1.4 GPa and indentation modulus of EIT = 486 ± 22 GPa were determined. The highest hardness of Fe2B was determined in the presence of tungsten as an alloying element, HIT = 20.8 ± 0.9 GPa. The lowest indentation hardness is measured in manganese alloyed FeB and Fe2B. In both FeB and Fe2B, an indentation size effect was observed, showing a decrease of hardness with increasing indentation depth.

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“…There are several widely used methods of thermalchemical surfaces treatment (TCT), such as nitriding, carburizing, boriding, which provide high functional properties. Complex diffusion treatment with boron and aluminum allows increasing wear resistance, oxidation at high temperatures, corrosion and other properties of forming tools' working surfaces [1][2][3]. Functional properties depend on many factors of the technological process, and they are configured during preliminary surface preparations, diffusion boroaluminizing and surface finishing.…”

Section: Introductionmentioning

confidence: 99%

Surface Processing Technology in Improving Operational Properties of Hot-Work Tool Steel

Ulakhanov¹,

Mishigdorzhiyn²,

Greshilov³

et al. 2019

Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)

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The present study is devoted to the surface processing technology of 3Х2В8Ф hot-work tool steel and the effect on its operational properties. The surface processing included thermal-chemical treatment (TCT) and surface finishing. Boroaluminizing (joint diffusion with boron and aluminum) was chosen as a TCT method. Steel samples were covered by a treatment paste, containing boron carbide, aluminum and sodium fluoride powders. The exposure time was 2 hours and the treatment temperature-950°C and 1050°C. The surface finishing was carried out by an elbor grinding tool to coordinate grinding on a vertical milling machine. The diffusion layers with a composite structure were formed on top of the steel as a result of TCT at 1050°C. Processing at 950°C resulted in a diffusion layer formation with layered structure. The surface roughness after boroaluminizing have increased from initial Ra 1.5 μm to Ra 4 μm after 950°C TCT and to Ra 7.7 μm after 1050°C TCT. The roughness increase was due to surface reactions with air components, such as oxygen and nitrogen, as well as their penetration to the upper zones. Applying surface finishing as a final mechanical operation (FMO) resulted in roughness reduction from the above mentioned values to Ra 0.09 μm to Ra 0.43 μm, respectively. In addition, the upper redundant zone of the layer was removed with no damage done to the inner zones by means of FMO. The provided surface quality ensures sufficient operational properties of the machine parts and details made of this particular steel.

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Plasticity of Boronized Layers

Cited by 48 publications

References 0 publications

Influence of the Crystalline Structure on the Mechanical Properties of Dodecaborides of Rare-Earth Metals and Zirconium

Influence of the Crystalline Structure on the Mechanical Properties of Dodecaborides of Rare-Earth Metals and Zirconium

The Influence of the Third Element on Nano-Mechanical Properties of Iron Borides FeB and Fe2B Formed in Fe-B-X (X = C, Cr, Mn, V, W, Mn + V) Alloys

Surface Processing Technology in Improving Operational Properties of Hot-Work Tool Steel

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