Materials Literature
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Purpose. Prospectivity assessments of the nanomaterials usage in construction technologies at the same time meeting the requirements of environmental safety and rational use of the natural resources. Methodology. During the study the building composites, in particular concretes, which are obtained on the base of the r…
Describedin the general view was the problem of operation of cranes, a brief analysis of modern computer-aided design, task and highlights the problems the solution of which is the aim of this article. The analysis of the stress state in view of the actual state (presence of defects , repair patches) on the example of…
The article presents the research of the influence of intensity in melting zone outward layer steel ВСт3сп5+10Х13 for extend construction. Te proposed estimations make it possible to predict the service lives of metal structures until failure
The paper investigates the regularities and mechanisms of corrosion dissolutionof Cr, Ni and Fe in steel AISI 321 in chloride solution with pH5 and chloride concentration of 600 mg/l. It was shown that structural heterogeneity had more intense corrosive effect on the loss of steel than its chemical composition variati…
Binary mixtures containing hydrous oxides of titanium, aluminum, lanthanum, and cerium with various ratio of ingredients have been synthesized by means of co-precipitation method from water solutions. The physical and chemical properties of the target materials have been characterized by X-ray diffraction, scanning el…
Purpose. As a rule secondary silumins are characterized by lower quality than their primary analogues. During manufacture of alloys a large quantity of intermetallides, first of all on the basis of iron, in their structure is ignored. To achieve the optimum level of properties it is necessary to search for ways to ada…
Purpose. Most of the freight traffic in Ukraine is made by railway transport. Government statistics of annual railway freight traffic (January-November) records the following data: 2011 - 468 million tons (108.2% to 2010); 2012 – 421.5 million tons (98.5% to 2011); 2013 – 441.8 million tons (96.6% by 2012). Despite th…
Discussed was one of the problems steelmaking process efficiency – a clear idea of the nature of the thermodynamic solutions of arsenic in liquid iron. On the basis of this method and set the description of the concentration distribution of the diffusant in the direction of diffusion. Experimentally and theoretically…
Improved was method for introducing wire, stripe tape in liquid iron-carbon melt, by which the additional impact on the wire, stripe it is possible to increase the rate and intensity of the input, which provides an increase in the degree of assimilation of the input material.
The article describes the modern theory of crystallization and methods of large steel ingots research. Performed was a critical analysis of ways to influence oncrystallizing metal in order to improve the quality of steel ingots. By physical modeling and experimental studies in industrial conditions was proved the poss…
At steel manufacturing and in the theory of the process liquidus temperature of steel is not always taken into account. It was found that according to the literature that the overheating of the steel liquidus and its mechanical properties depend on the temperature of the liquidus. We propose a way of refining the opti…
This paper examines the impact of secondary tungsten alloying on the morphologyand chemical composition of the carbide phase tool steel for hot working 3X2B8Ф. Similar results were found for experimental and base steel grades. Prescribed were recommendations for replacement ferro-tungsten with experimental ligatures,…
It is established that distribution of manganese between carbides and metallic base in high-chromium cast irons depends on manganese content in the alloy. Alloying of carbides with manganese increases its hardness
This article shows the efficiency of application of the differentiated approach to the choice of the rational modes of heat treatment of steels from 18 % Cr, allowing considerably to promote their wear resistance due to optimization of amount and stability of austenite
The results of research on getting good combination of mechanical properties of steel 40HN and 40HN2MA by heat treatment were presented, which include heating in inter-critical temperature interval (ITI),which create heterogeneous multiphase structure in them
Experimentally and theoretically investigated were the thermo-physical properties of industrial ferroalloys. Calculated were enthalpies of crystallization temperature and liquidus average specific heat for a few samples of ferroalloys used for deoxidation and alloying of steel in ladle furnace
It is found that during oxidizing heating at 1000-1150 оС the secondary and eutectic carbides dissolution accompanied by carbon content decreasing and chromium content increasing in surface layers of highchromium cast iron takes place. The processes kinetics is studied, kinetic parameters are found, activation energy…
The problem of creation of new economical surfacing material, not containing expensive components (Ni, Mo, Nb, W and others) and new strengthening technologies for steels is quite actual and modern for many countries. One of the way of solving this problem is to develop metastable austenite conditions and realize them…
An experimental method for investigation of combustion of single coal particles, which allows to determine the reactivity of different coal types was developed. The possibility, with this method, to determine the combustion of coal particles for a fraction of up to 160 microns experimentally, and for a fraction of up…
Les membranes nanofibreuses obtenues par électro-filage sont couramment utilisées pour diverses applications biomédicales telles que les pansements ou la régénération tissulaire, en raison de leur grande porosité et de leur morphologie mimant la structure des tissus humains. Au cours de cette thèse, nous avons étudié…