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Izvestiya. Ferrous Metallurgy

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Vol 56, No 4 (2013)
View or download the full issue PDF (Russian)
https://doi.org/10.17073/0368-0797-2013-4

RESOURCE SAVING IN FERROUS METALLURGY

3-5 555
Abstract
This article describes the arc method of obtaining Fe – Cu alloys from tin ore wastes. The questions are discussed connected with Bardin’s paradigm of waste-free processing of mineral raw materials. The technology of obtaining, composition and microstructure of alloys are investigated. The results have practical importance. It will be serious contribution into development of resource-saving technologies if results are implemented in industry.

INFORMATION TECHNOLOGIES AND AUTOMATIC CONTROL IN FERROUS METALLURGY

34-38 514
Abstract
This report presents the development of cycles used by authors in the creation of the computer decision support system, allowing to size up an arrangement and the form of a zone of viscousplastic weights of iron metal materials (plastic zone) in a blast furnace, to carry out diagnostic of its rational configuration under really accessible information on the working blast furnace for the base period, and also to solve a complex of problems for the design period at change of operating conditions of fusion. The article reflects the functionality and the results of use of the software to solve technological problems in the blast-furnace process of OJSC Magnitogorsk Iron and Steel Works.
39-42 485
Abstract
There is a concept “balanced stimulation function” of design team, by analogy with widespread concept of project management “balanced design”, which assumes dependence stimulus from three variables: budget deviation, duration, project quality from planned one. The actual project quality is understood as quantity loss, which are beard by the project customer and IT-provider on an initial operation stage. Two mechanisms of ac- tual project quality estimation are offered: for IT- services suppliers of with developed and immature IT- processes. The synthesis problem statement of balance stimulation function for parametrically set class of functions, synthesis problem decomposition of stimulation function and analytical procedures of the private subtasks solution are also given.

SHORT REPORTS

43-44 523
Abstract

In this research the authors adduct the technique of determining the effect on the performance of the capture angle grinders with a plane-parallel movement of jaw by calculating the time required for crushing. The analysis of the edata shows that with increasing the angle of the capture at a constant degree of fragmentation while crushing is reduced and, thus, the productivity is increasing, which is confirmed experimentally.

METALLURGICAL TECHNOLOGIES

6-11 520
Abstract
The structure and properties of the composite coatings of nickel - chromium boride nano are investigated. It was set that the chromium diboride state of nano provides when used in the technology of composite nickel formation of fine-grained structure, reducing internal stress and improve their physical and mechanical properties, is to increase the hardness, resistance to wear and corrosion in liquid and gaseous media. Isothermal annealing of composite coatings improves adhesion to the substrate.
12-17 633
Abstract
The parameters of equilibrium in a process of reduction of iron oxides with water gas (CO – CO2 – H2 – H2O) in a presence of carbon are cal- culated. For the first time the graphical presentations of the results contain space diagram, consisted of combination of surfaces of three phase equi- libriums, lines of four phase equilibriums, and point of nonvariant five phase equilibrium obtained as an intersection of abovementioned lines. The equilibrium water gas compositions above the mixtures of Fe3O4 – C, Fe3O4 – FeO – C, FeO – C, FeO – Fe(С) – C, Fe(С) – C and Fe3O4 – Fe(С) – C are established. The graphical method for determination of water gas compositions above these mixtures is proposed.
21-24 550
Abstract

The necessity of taking into account the longitudinal stability of band during the work of the system of rolling stand – non-drive tool is snown. Proposed to determine the dependence of the distance between the roll cage and non driven tools, which provides longitudinal stability bars. Con- sidered from the perspective of the condition of the longitudinal stability of processes: rolling in the drive – non drive cage, rolling-the separation of the non-drive dividing tools and given appropriate recommendations.

25-27 460
Abstract

The article examines the impact of parameters of impulse process on the quality of form and the castings. The results of study of the pressure effect over a mixture on the form durability and pressure on the model surface are given. A mathematical yield surface for the form durability depend- ing on hermetic criterion of model-flask accessory and pressure in the receiver in estimating the form parameters without an additional experimental investigation is constructed.

18-21 610
Abstract

The results of research of influence of thickness of slag are presented on the different parameters of cooling of metal in a ladle capacity of 350 ton. The research is carried by means of two-dimensional mathematical model. By means of mathematical modeling the essential role of slag is es- tablished when cooling metal in a ladle, heat losses through slag are 60 – 70 %. Established and explained the phenomenon of “self-locking” heat of the metal in the ladle during the formation of a hard crust on the surface of the slag. The optimum thickness of the slag is 0,15 – 0,20 m. The results can be used in industrial practice in order to reduce heat losses during secondary treatment technology.

27-30 1086
Abstract

During the rolling of balls on ball-rolling mill deformation of the metal is in the rolls with screw gauges. In view of such a character of the rolling of deformation is concerned, and can be divided into the forming section, where the rolls bite the billet and reduce it gradually into the ball shape, and the finishing section, where the ball is rolled to the final size and severed from the rest of the billet. A normal process of rolling is provided for by designing the forming section of the pass groove. In the article outcomes the calculation of roll pass designed for rolling of balls. The calculation outcomes for roiling of balls 125 mm. The article provides the initial data for roll pass design of a ball mill.

30-33 493
Abstract
The work shows the possibility of reducing the oxygen content in the welds by automatic arc welding flux with the introduction of carbon- fluorine containing supplements, thus reducing the content of nonmetallic inclusions, and increased mechanical properties and impact strength (especially at low temperatures) of welds. It was determined that the introduction of the carbon-fluorine content into the flux AN-60 in amounts of less than 6 % when welding low-alloy steel does not exceed the allowable values, and no significant effect on the hardness of the metal.

TOPICAL COLLECTION OF ARTICLES «NANOSTRUCTURED MATERIAL SCIENCE»

45-46 523
Abstract
This introduction paper is devoted to the review of nanostructure materials science over the last few years. The main attention is focused on the foreign publications of the articles in leading journals. It is noted that some of the papers presented in this issue will be presented in the conference “Fundamental and the apply aspects of external energy effect on nanomaterials”.
46-50 493
Abstract
Atomic structure of triple junctions of high-angle tilt boundaries <111> and <100> and mixed-type grain boundaries in nickel were studied by method of molecular dynamics. It is shown that equilibrium triple junction has not got any structural features, which able to single it out as a special defect among its constituent grain boundaries. The effective radius of considered triple junctions and the width of the grain boundaries were determined.
50-53 586
Abstract
Basing on published data with the help of geometrical construction of multicomponent phase diagrams the hypothetical three-dimensional diagram of Cu – Pd – Pt ternary system was created. This calculations are based on topological principles. On the charted diagram there are some areas of weakly stable transitional long-period structural-phase states, where the alloys structure include the nano-elements. The attempt to create the forecast method of perspective nano-structured functional materials was made.
54-59 543
Abstract

Regularities of structure modification and changing wear resistance under boundary lubrication friction of 110Mn13 steel in as supplied condi- tion and after impact ultrasonic treatment were studied. The strain induced relief to form on lateral face of specimens under study at compression and triboloading were examined and similarity in regularities of its formation was shown.

59-62 552
Abstract

The effect of aggressive media (solution NACE and H2SO4 ) on the dependence σ – ε, obtained by simultaneous transmission of electric current pulses accompanied by short discharge stress is investigated. The dependence of stress relief in the materials on the density of the pulsed electric current is established. The structural and morphological state of the alloy surface after exposure to corrosive media with different concentrations is investigated.

62-65 449
Abstract
The formation of white layers in the implementation of the spherical indenter in elastic-plastic half-nickel-titanium, its structural-phase state are investigated. It is shown that the white layers are finely nanostructured austenite-martensite system with high strength and plasticity, which was formed in hydrostatic “kernel” pressures.
66-70 843
Abstract
The mechanisms of changing of key parameters of longitudinal and shear waves in springjsteel rods (60C2A) after different thermal treatment modes are described. The methods presented in the article provide high precise evaluation of such key parameters as wave speed and wave damping, efficiency of electromagnetic acoustic transformation which are used in assessment of elastic characteristics, thermal treatment quality and structure of material in the process of realization of electromagnetic acoustic repeated reflection method. Real flaw sensitivity of shadowgraph method based on repeated reflections under electromagnetic acoustic impulse and receiving of ultrasound tested on steel rods is demonstrated.


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ISSN 0368-0797 (Print)
ISSN 2410-2091 (Online)