Structural characteristics and mechanical properties of sintered Fe-B4C materials

Ткаченко, В. Ф.; Kogan, Yu. I.

doi:10.1007/bf00795022

Cited by 9 publications

(3 citation statements)

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“…To produce low-porosity samples from a Fe-B-C charge by liquid-phase sintering, the particles of the starting powder, according to different authors, should not be larger than 60-100 µm [3][4][5], whereas standard watersprayed iron powders used for structural purposes include coarser fractions that amount to about 30% of the total mass. One of the effective methods to improve the agglomeration of such powders is grinding.…”

Section: 762mentioning

confidence: 99%

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Grinding of Fe-B4C powder charge in an inertial cone mill

Baglyuk

Pyatachuk

Dyadyun

et al. 2008

Powder Metall Met Ceram

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621.762The use of an inertial cone mill to grind iron and boron carbide powder mixtures is examined. The dependence of the particle-size distribution in the mixture after grinding on the maximum particle size is analyzed. It is established that the content of coarse-grained fractions (larger than 100 μ m) substantially decreases as compared with the initial powder even after three grinding cycles. If the number of grinding cycles is increased to 20, the content of finer fractions (smaller than 63 μ m) is only 6 to 8% higher than in powders subjected to 3-12 grinding cycles in the inertial cone mill. Therefore, more than 3 or 6 cycles to produce Fe-B 4 C powder with the optimal content of the ≤100≤63μ m fraction are unreasonable.Recently, the attention of researchers has been focused on iron-based boron alloys owing to their high strength, hardness, and wear resistance and relatively low cost. Thus, they can be regarded as promising materials for making wear-resistant alloys [1,2]. For example, the study [3] shows that the wear resistance of coating composite materials based on the Fe-B-C system is comparable with and, on occasion, greater than that of materials based on tungsten carbide, which is more expensive.Boron carbide not only hardens the material, but also activates sintering because eutectic transformation occurs in the Fe-B-C system, contact melting occurs in the iron-boron carbide powder mixture at temperatures above 1100°C, and the liquid phase activates consolidation [4]. The heterogeneous structure of the material, which is an alloyed matrix with hard inclusions of complex carbides and borides, is responsible for high wear resistance [2].To produce low-porosity samples from a Fe-B-C charge by liquid-phase sintering, the particles of the starting powder, according to different authors, should not be larger than 60-100 µm [3][4][5], whereas standard watersprayed iron powders used for structural purposes include coarser fractions that amount to about 30% of the total mass. One of the effective methods to improve the agglomeration of such powders is grinding. Thus, it is necessary to develop an efficient method for grinding sprayed powders. This paper examines the possibility of using an inertial cone mill (ICM) to grind powder mixtures of iron and boron carbide. This mill is distinguished from mills of other types by a specific way the load is applied to particles being ground. For example, most mill designs apply a concentrated load of random magnitude and site of application to the powder (which quite often leads to nonselective breaking and balling of particles), whereas the particles in the ICM are in a triaxial stress state due to cyclic loading in the chamber [6]. Since entering the grinding chamber, a particle suffers more than hundred processes of compression, shear, bending, and unloading. During motion, the particle changes the shear vector, which promotes its breaking on the weakest planes. Figure 1 shows the ICM design. External grinding cone 2 and spherical support 4 of internal grinding c...

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Section: 762mentioning

confidence: 99%

“…Arrangement of inertial cone mill[5]: 1) feed cavity; 2) external grinding cone; 3) internal grinding cone; 4) spherical support; 5) unbalanced-mass vibration generator; 6) grinding chamber; 7)…”

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Grinding of Fe-B4C powder charge in an inertial cone mill

Baglyuk

Pyatachuk

Dyadyun

et al. 2008

Powder Metall Met Ceram

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“…3 1a) and 3% B 4 C (2) as a function of graphite content of the charge 10 mm in diameter and height were pressed under 800-1000 MPa and sintered at 1150°C, selected on the basis of our previous studies [7,8], in a melt-sealed container in calcined sand with 1% graphite. For reference, we made samples from mixtures of iron powder of the same grade and boron carbide, but without additional carbon.…”

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Structure and properties of sintered iron–boron–carbon alloys with different carbon contents

Napara-Volgina

Baglyuk

Orlova

et al. 2011

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The structure and mechanical and tribotechnical properties of iron-boron-carbon alloys produced from a mixture of iron, boron carbide, and graphite powders by single pressing and sintering are used to examine heterophase wear-resistant materials containing from 0.8 to 2.4% boron and from 0.7 to 1.6% fixed carbon. The wear resistance of the materials depends on the ratios of boron and carbon in them and on their total content and substantially exceeds the wear resistance of ShKh15 steel chosen as a reference sample.Iron-carbon alloys are most commonly used structural powder materials since their production is relatively simple and the initial components are readily available [1,2]. To improve basic mechanical and operational properties of these alloys, they must be additionally doped.Boron carbide is a compound that has proved to be highly effective in doping sintered structural iron-based materials (especially in the manufacture of parts subjected to wear during operation) [3-9] and wear-resistant coatings [10][11][12][13][14].We have analyzed papers that focus on the production and properties of boron-containing powder materials for different purposes (including wear-resistant ones) that are made of iron powder mixtures with different contents of boron carbide and revealed that the structure and properties of these materials can be controlled not only through variation in their B 4 C content [7] but also through additional introduction of carbon into the initial charge [8], which leads to significant hardening of Fe-B 4 C materials.There have been no systematic studies of the tribological properties and structure of these materials. The only exception is the paper [5] that provides the wear characteristics of Fe + 3% B 4 C material; however, it is difficult to assess them appropriately as the paper includes no data on experimental conditions, in particular, loading and the counterface rotation speed and time.

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