scholarly journals Database Clustering after Automatic Feature Analysis of Nonmetallic Inclusions in Steel

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1650
Author(s):  
Andrey Zhitenev ◽  
Maria Salynova ◽  
Alexey Shamshurin ◽  
Sergey Ryaboshuk ◽  
Vladislav Kolnyshenko
Keyword(s):  
Nonmetallic Inclusions ◽  
Negative Impact ◽  
Gas Analysis ◽  
Feature Analysis ◽  
Current State ◽  
Similar Chemical ◽  
Metallic Inclusions ◽  
Fractional Gas Analysis ◽  
Database Clustering ◽  
Real Composition

Non-metallic inclusions (NMIs) in steel have a negative impact on the properties of steel, so the problem of producing clean steels is actual. The existing metallographic methods for evaluating and analyzing nonmetallic inclusions make it possible to determine the composition and type of NMIs, but do not determine their real composition. The analysis of single NMIs using scanning electron microscope (SEM), fractional gas analysis (FGA), or electrolytic extraction (EE) of NMIs is too complicated. Therefore, in this work, a technique based on the automatic feature analysis (AFA) of a large number of particles by SEM was used. This method allows to obtain statistically reliable information about the amount, composition, and size of NMIs. To analyze the obtained databases of compositions and sizes of NMIs, clustering was carried out by the hierarchical method by constructing tree diagrams, as well as by the k-means method. This made it possible to identify the groups of NMIs of similar chemical composition (clusters) in the steel and to compare them with specific stages of the steelmaking process. Using this method, samples of steels produced at different steel plants and using different technologies were studied. The analysis of the features of melting of each steel is carried out and the features of the formation of NMIs in each considered case are revealed. It is shown that in all the studied samples of different steels, produced at different steel plants, similar clusters of NMIs were found. Due to this, the proposed method can become the basis for creating a modern universal classification of NMIs, which adequately describes the current state of steelmaking.

scholarly journals CONTENT MODIFICATION OF DIFFERENT TYPES OF NONMETALLIC INCLUSIONS DURING LOW-CARBON IF STEEL LADLE TREATMENT

2019 ◽  
Vol 62 (5) ◽  
pp. 345-352 ◽  
Author(s):  
D. V. Gorkusha ◽  
K. V. Grigorovich ◽  
A. V. Karasev ◽  
O. A. Komolova
Keyword(s):  
Nonmetallic Inclusions ◽  
Ladle Treatment ◽  
Gas Analysis ◽  
Metallographic Analysis ◽  
Steel Ladle ◽  
Interstitial Free ◽  
If Steel ◽  
Low Carbon ◽  
Metallic Inclusions ◽  
Fractional Gas Analysis

Development of advanced materials for the automotive industry allows us to produce a lighter body without losing strength characteristics of the structure. It became possible by the creation and subsequent introduction into the production of such steel grades as IF (Interstitial Free) – steel with no interstitial solute atoms to strain the solid iron lattice and IF-BH (Bake Hardening) – steel with hardening during hot drying. The article provides a brief overview of the history of the emergence of IF steel and the current situation in the production of it in Russia. One of the quality criteria for steels of IF grades is purity of the metal by non-metallic inclusions (NMI), which negatively affect the plastic properties of the material, lead to the formation of surface defects of flat rolled products and reduce the manufacturability due to a decrease in the casting speed of steel, as they cause overgrowing of steel casting nozzles. The article presents investigation results of the content, composition, size and morphology of non-metallic inclusions (NMI) in the metal samples taken at all stages of ladle treatment and casting of IF steel grade production using quantitative metallographic analysis, electrochemical dissolution (ED) followed by X-ray microanalysis of isolated inclusions, Auger electron spectroscopy and fractional gas analysis (FGA). As a result of the analysis of inclusions in the studied samples using a scanning electron microscope, according to morphological features, five characteristic types of inclusions were identified, which reduce the performance properties and strength cha racteristics of the materials produced from them. Results of the analysis of nonmetallic inclusions in metal samples obtained by the ED method are in good agreement with the results of the determination of oxide nonmetallic inclusions by the FGA method. The method of fractional gas analysis shows the dynamics of changes in the content of various types of oxide nonmetallic inclusions during the secondary (ladle) treatment of steel. It is shown that application of the FGA method allows to make analysis of causes of the harmful NMI formation in the metal and to correct operations at ladle treatment.

scholarly journals Interaction of rail steel melt with refractory lining

2021 ◽  
Vol 64 (7) ◽  
pp. 484-487
Author(s):  
A. М. Grigor’ev ◽  
K. V. Grigorovich ◽  
А. Yu. Em ◽  
A. O. Morozov
Keyword(s):  
Rail Steel ◽  
Refractory Lining ◽  
Gas Analysis ◽  
Aluminum Oxides ◽  
Domestic Enterprise ◽  
Steel Making ◽  
Metallic Inclusions ◽  
Fractional Gas Analysis ◽  
Steel Grades ◽  
Steel Properties

The rail steel properties are adversely affected by rigid non-metallic inclusions, containing aluminum oxides. Therefore, aluminum content is limited to 0.004 % wt. in rail steel grades. Aluminum can get into steel from charge materials and refractory lining. In this work, we’ve analyzed how the chemical composition of refractories used in rail steel making influence steel quality on example of one domestic enterprise. To determine the main types of non-metallic inclusions created in E76F rail steels, we have performed fractional gas analysis of the samples taken in various process steps. It was found that the slag composition after degassing changes insignificantly, while the most part of non-metallic inclusions in rail steel is represented by aluminates.

scholarly journals Application of Some Modern Analytical Techniques for Characterization of Non-Metallic Inclusions in a Fe-10mass%Ni Alloy Deoxidized by Ti/Zr and Ti/Mg

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 448
Author(s):  
Andrey V. Karasev ◽  
Dmitry Gorkusha ◽  
Konstantin V. Grigorovich ◽  
Pär G. Jönsson
Keyword(s):  
Analytical Techniques ◽  
Gas Analysis ◽  
Electrolytic Extraction ◽  
Oxide Inclusions ◽  
Metallic Inclusions ◽  
Ni Alloy ◽  
Fractional Gas Analysis ◽  
Mg Addition ◽  
Modern Analytical

In this study, a complete and comprehensive analysis of non-metallic inclusions (NMI) in an Fe-10%Ni alloy was done by using two modern analytical methods that complement each other: Electrolytic Extraction (EE) of inclusions from metal samples followed by investigations by using Scanning Electron Microscopy (SEM) and Fractional Gas Analysis (FGA). The composition, morphology, size and number of different NMIs and clusters were investigated in metal samples taken after deoxidation by additions of Ti, Ti/Zr and Ti/Mg. The obtained results were discussed with respect to formation, modification and removal of NMIs and clusters depending on the type of deoxidations and the holding time. It was found that the peaks of oxygen reduced from different oxide inclusions obtained by the FGA measurements corresponded well to the main types of inclusions and clusters observed by using the EE + SEM method. More specifically, the total O content in oxide inclusions (ONMI) increases by 10% after a Zr addition and then decreases linearly by 40% during 5 min of holding due to flotation of NMIs and clusters. However, after a Mg addition in the melt deoxidized by Ti, the ONMI content decreases drastically by 63% during 5 min of holding, due to a fast floatation of NMIs caused by bubbles of vaporized Mg.

scholarly journals Current state and development trends of livestock in the Republic of Kazakhstan

2021 ◽  
Vol 16 (2) ◽  
pp. 134-144
Author(s):  
S. M. Yessengaliyeva ◽  
M. A. Mansurova ◽  
A. D. Makhmudov ◽  
L. V. Fedorchenko
Keyword(s):  
Negative Impact ◽  
Low Cost ◽  
Meat Products ◽  
Animal Husbandry ◽  
Farm Animals ◽  
Industrial Complex ◽  
Resource Saving ◽  
Livestock Industry ◽  
Current State ◽  
The Republic

The article is devoted to the study and analysis of the current state of the animal husbandry industry in the Republic of Kazakhstan in the context of regions. The indicators of the dynamics of the number of livestock of farm animals for the period 2015-2019 by regions, indicators of productivity in the industry, indicators of the volume of production of meat products are analyzed. The dynamics and structure of costs in the country’s livestock industry are also considered.Today, one of the most pressing problems in the development of the agro-industrial complex is the low level of labor productivity due to low automation and digitalization of technological processes. The need to meet the demand for livestock products in the domestic market of the Republic of Kazakhstan, as well as to increase its export resources, poses a challenge for Kazakhstani science and practice to develop, scientifically substantiate and master modern technologies for the production of low-cost, environmentally friendly, competitive products of the industry. They should be resource-saving, aimed at maximizing the use and improvement of the genetic potential of farmed farm animals, adapted to the specific natural and economic conditions of the regions of the republic. The development and mastering of such technologies will make it possible to weaken the negative impact of the industry on the environment, reduce the cost of material resources, and effectively use the available land and water resources [5].The main problems hindering the effective development of the country’s livestock industry are identified. The promising strategic directions for the development of this industry have been determined. From the point of view of experts of the financial organization, the country has good potential and opportunities to export its beef and pork to China, and the lamb of the Edilbay sheep breed to the countries of the Middle East.

Economic expertise as a tool to counter the shadow economy

2021 ◽  
pp. 131-136
Author(s):  
С.В. Банк ◽  
В.Ф. Вакуленко
Keyword(s):  
Shadow Economy ◽  
Negative Impact ◽  
Economic Security ◽  
The State ◽  
Large Percentage ◽  
Economic Situation ◽  
Public Finances ◽  
Economic Relations ◽  
Current State ◽  
Almost All

Теневая экономика проникает практически во все экономические сферы жизнедеятельности общества. Она включает в себя различные экономические отношения, которые находятся за рамками закона в областях производства, потребления, обмена и распределения. Воспрепятствование теневой экономике, предстающей одной из базовых угроз экономической безопасности страны, есть необычайно актуальное явление в настоящее время. Современное состояние сектора теневой экономики в России весьма динамично развивается, что влечет за собой негативное воздействие на социально-экономическое положение государства. В основном, это относится к представителям малого и среднего бизнеса, который занимается предоставлением услуг и производством разнообразных товаров. Актуальность избранной тематики заключается в том, что сейчас в России большой процент теневых доходов, тогда, как эти деньги могли быть направлены на становление и развитие МСП, особенно во времена обостренной пандемии, что позволило бы минимизировать экономическую напряженность и нарастить результативность государственных финансов. The shadow economy penetrates almost all economic spheres of society. It includes various economic relations that are outside the scope of the law in the areas of production, consumption, exchange and distribution. The obstruction of the shadow economy, which appears to be one of the basic threats to the economic security of the country, is an extremely relevant phenomenon at the present time. The current state of the shadow economy sector in Russia is developing very dynamically, which entails a negative impact on the socio-economic situation of the state. This mainly applies to representatives of small and medium-sized businesses that provide services and produce a variety of goods. The relevance of the chosen topic lies in the fact that now there is a large percentage of shadow income in Russia, while this money could be used for the formation and development of SMEs, especially during times of an acute pandemic, which would minimize economic tension and increase the effectiveness of public finances.

scholarly journals Prospective directions for development of metallurgy and materials science of steel

2017 ◽  
Vol 89 (10) ◽  
pp. 1553-1565 ◽  
Author(s):  
Alexander I. Zaitsev
Keyword(s):  
Materials Science ◽  
Raw Material ◽  
Material Base ◽  
Efficient Technology ◽  
Chemical Methods ◽  
Current State ◽  
Physico Chemical ◽  
Metallic Inclusions ◽  
Reducing Costs ◽  
Qualitative Characteristics

AbstractThe features of current state of metallurgical technology and materials science of mass high-grade steels are viewed. A promising direction for principle improvement of the complex of properties and qualitative characteristics of steel including those, which are difficult to combine, is shown. It is the development of adequate physico-chemical methods of prediction and efficient technology methods of management of non-metallic inclusions, forms of presence of impurities, phases precipitations, structural state, including uniformity over the volume of metal. Additionally this approach allows reducing costs and expanding the raw material base. Its effectiveness is illustrated by the results of research carried out for a number of groups of mass high-quality steels.

Biopolymers in wood-based materials – a recent review

2020 ◽  
Vol 110 ◽  
pp. 25-34
Author(s):  
Aneta Gumowska ◽  
Grzegorz Kowaluk
Keyword(s):  
Negative Impact ◽  
Raw Materials ◽  
Green Composites ◽  
Promising Alternative ◽  
Current State ◽  
State Of Art

Biopolymers in wood-based materials – a recent review. The aim of the paper was to summarize the current state-of-art in the field of biopolymers application in the composites based on lignocellulosic raw materials. The cited literature show, in research and experiments, how promising the green composites market becomes. Biocomposites are becoming more interesting and promising alternative to commonly used petropolymers, which have a negative impact on health and the environment.

Nonmetallic inclusions in rails made of electro-steel alloyed with chromium

2020 ◽  
Vol 62 (12) ◽  
pp. 936-942 ◽  
Author(s):  
A. A. Umanskii ◽  
A. V. Golovatenko ◽  
A. S. Simachev
Keyword(s):  
Hot Deformation ◽  
Ultrasonic Testing ◽  
Nonmetallic Inclusions ◽  
Relative Concentration ◽  
Metallographic Analysis ◽  
High Ductility ◽  
High Concentration ◽  
Metallic Inclusions ◽  
Significant Concentration

Type, relative concentration and size of most characteristic non-metallic inclusions for the elements of rails (head, web) from electro-steel of E79KhF and E90KhАF grades were determined on the basis of metallographic (with a microscope “OLYMPUS GX-51”) and spectral (using spectrometer “ARL iSpark” method “Spark-DAT”) analyses. It was found that the highest relative concentration of manganese sulfides (MnS) is 30.8 – 43.4 ppm. At the same time, 60 – 100 % of inclusions of this type are of small sizes (less than 4 μm), and it does not allow them to be detected using standard metallographic analysis with 100-fold magnification. The revealed high relative concentration of sulfide inclusions directly correlates with the established positive sulfur liquation in considered rail elements, which is up to 40 %. Despite the high concentration of manganese sulfides, their influence on the quality of rails can be considered not dangerous, taking into account their high ductility during hot deformation and the established prevalence of inclusions of this type with small size (less than 4 μm). Among inclusions of a silicate type, SiO2 inclusions (3.4 – 14.9 ppm) have a significant concentration. All detected inclusions of this type have a size not exceeding 4 μm. It was found that the concentration of complex inclusions containing alumina (Al2O3 – CaO – MgO, Al2O3 – CaO – MgO – CaS, Al2O3 – CaO, Al2O3 – MgO) is insignificant: in total it does not exceed 3.1 ppm and 1.6 ppm for individual types. The concentration of corundum (Al2O3) is also insignificant and does not exceed 0.3 ppm. In this case, alumina inclusions of small size (less than 6 μm) prevail. Due to the low contamination (taking into account the relative concentration and size of inclusions) with non-plastic silicate and alumina non-metallic inclusions, their influence on the quality of the rails was not significant. It is confirmed by the absence of defects detected during ultrasonic testing.

scholarly journals POCT in Emergency Rooms: One Key Factor for Process Streamlining with Lean Management

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Verena Lindenau-Stockfisch ◽  
Julia Searle ◽  
Martin Möckel
Keyword(s):  
Negative Impact ◽  
Patient Flow ◽  
Waiting Times ◽  
Care Hospital ◽  
Lean Management ◽  
Emergency Rooms ◽  
Flow Process ◽  
Value Stream ◽  
Current State ◽  
Key Factor

Overcrowding is a common problem in Emergency Departments (ED) worldwide and has a negative impact on patient satisfaction and, more importantly, patient safety. So, the Emergency Department of the secondary-care hospital Paul Gerhardt Stift in Wittenberg, Germany, was faced with increasing numbers of patients. Lean management was introduced to analyse, optimise, and standardise ED processes. Consequently, a project group concentrated on “cycling muda” which is to identify waste and cost drivers along a representative patient path using one suitable Lean tool: mapping the current state in a value stream. As a result, it became clear that both patients and staff suffered from immense waiting times that lead to risky patient care and employee frustration. By subsequently eliminating the waste drivers and designing a high-quality patient flow process creating standards supported by state-of-the-art technology, the hospital’s ED turned into a streamlined department with reduced waiting times offering employees a satisfactory and modern workplace where patients benefit from first-class care.

scholarly journals THE CURRENT STATE OF INFORMATION AND ECONOMIC CRIMES IN UKRAINE

2020 ◽  
Vol 2 (6) ◽  
pp. 66-75
Author(s):  
Hanna Kostovyat ◽  
Vitaliy Serzhanov
Keyword(s):  
Negative Impact ◽  
Economic Status ◽  
Economic Security ◽  
Economic Crime ◽  
Criminal Cases ◽  
Foreign Markets ◽  
Current State ◽  
Economic State ◽  
Low Efficiency ◽  
Economic Crimes

Considered the quality of the investigation of information and economic crimes in Ukraine, carried out the analysis of the current state of cybersecurity and economic crimes, which have a negative impact on the modern state of the country.  The concepts of "economic security", "economic crime" and "cybercrime", which is closely related to each other criminal acts: cybercrime and cybercrime" are defined.  A comparative analysis of economic crimes for the third quarter is provided 2020, the dynamics of GDP of Ukraine, the rating of the economic state of security of the country. The level of information and economic crimes remains high, which is characterized by various consequences for the state, companies, citizens than ever before. Every year in Ukraine, the number of victims of cybercrime increases, especially during the Covid-19 pandemic, which made adjustments to the activities of organizations at the local and state levels The purpose of the article is to analyze the current state of cybersecurity and economic crimes that negatively affect the current state of the country, to highlight the main problems of the national cyber defense system. The economic status of the country is the main criterion for assessing a developed society, since the economy ensures a decent standard of living, the existence of the country and its progress. In order to ensure the fundamental development of the state's economy, it is necessary to create an appropriate production base, because the decline in production and its low efficiency are an important reason for the dependence of the Ukrainian economy on foreign markets, that is, its low level of economic security. It is also necessary to pay attention to criminal cases related to cybercrime, which operate in accordance with outdated methods that do not facilitate the collection of evidence or the completion of a decision on the case.

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