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Izvestiya. Ferrous Metallurgy

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Vol 56, No 3 (2013)
View or download the full issue PDF (Russian)
https://doi.org/10.17073/0368-0797-2013-3

METALLURGICAL TECHNOLOGIES

3-7 519
Abstract

To increase the resistance of the air tuyeres and reduce heat loss through the surface coating on the basis of boron carbide deposited on the tuyeres with aluminum thermal spray coating after heat treatment. Given the theoretical assessment of the impact on the basis of B4C coating to reduce heat loss through the air tuyeres. Effective use of coating confirmed by pilot testing at OJSC “NLMK” and metallographic examination of samples from tuyeres after operation.

ENGINEERING IN FERROUS METALLURGY

8-10 552
Abstract

Results of modeling of cylindrical blanks upsetting process are presented. Authors used three methods: computer simulating in finite-elements system QForm, calculation by the mathematical regress equation and physical experimentals in industrial environments. In the paper an adequacy evaluation of simulating results are given. Results of calculations on mathematical model coincide with results of simulating in QForm in 6 of 8 experiences (75 %). Results of industrial experiment coincide with results of computer simulating in QForm, under the form of a lateral surface of the upseted blanks in 5 of 8 experiences (62,5 %).

11-14 606
Abstract

The variant of a quantitative estimation of treatability metals by pressure on standard test methods of mechanical properties is offered. Communications of scientific and engineering characteristics of an estimation of deformability for use of results of scientific researches in factory practice are received, being guided on standard test methods. The example of use of the received equations for an estimation of limiting еlongation ratio for a number of steels in processes of rolling and drawings is resulted. The offered technique can be used for an estimation treatability new steels and alloys.

14-19 792
Abstract

Adhesive interaction of metal products with a tool inherent in the process of metal forming. Defects on the products and tools out of the order are the consequences of this. The problem of the choice of material for the instrument has been considered. On the example of mandrel tube drawing mechanism of fracture of adhesive fracture surface layer of metal has been described. Based on an analysis of the solids adhesion hypothesized that the adhesive activity is associated with the electron work function of the material tools. By method of photo-stimulated exoelectron emission electron work function for a number of ceramic materials has been determined. The relationship between the electron work function of the material and surface roughness of workpiece was detected. Criterion for selecting the tool material is formulated and a method of tube drawing fundamentally new quality has been developed.

20-22 539
Abstract

The method of determination range unification groups welded pipes for hem edges on the MSE sector. The features forming the periphery of the edge at hem for different load profiles, values of the deviations edges of the longitudinal deformation and edge radius value unifications punch for the entire range of pipes. According to the research it can be concluded about the qualitative edge hems billets spun on unification one-radius punch.

 

22-26 486
Abstract

The calculation of the absolute and relative increase in length of the fiber material, their true strain in the central and peripheral layers of the wire piece, depending on the draw ratio solid round billets. When driving in the hearth of plastic deformation fibers can only be shortened or lengthened or shortened at first, and then lengthen. Calculations have shown that for certain values of the degree of deformation of the wire may be a maximum of inhomogeneous deformation of fibers in cross-section and in the amount of plastic deformation.

 

 

MATERIAL SCIENCE AND NANOTECHNOLOGIES

27-33 483
Abstract

The study of chemical interactions between the components of the three types of bundles with different chemical compositions based on Co, Fe (V-21), as well as copper and nickel (B-13) in the process of manufacturing a diamond tools by hot pressing. Found that the pressure intensifies the chemical interaction of the basic components of ligaments Co and B-13 with a diamond. Observed active dissolution of diamond in cobalt and inter- action with the solid solution based on α-Fe to form iron carbides Fe3C (B-13). In the contact-bond diamond is the active chemical interaction leads to embrittlement and cracking ligament in the manufacture of chips. The addition of diamond powder AM 14/10 to a bunch of V-21 and sintering at 860 °C for 9 min does not change the parameters of a solid solution of iron-based, that is, chemical interaction bunch-diamond is much slower and brittle contact zone ligament-diamond happens.

34-38 598
Abstract

Describes identifying complex grain structures on metals and alloys sections algorithm. Example results of section picture processing and analysis, which confirms possibility of usage developed algorithm for complex grain structures parameter identification.

38-47 521
Abstract

ΔVС oscillation frequencies, caused by interaction processes between oxygen torch, slag and metallic phases in reaction zone, are of greatest im- portance for practical control over oxygen furnace process. This was proved in course of experiments to study the transient processes in Hφ → ΔVС , VO2  → VС , and slag-forming VС channels. VO2   → VС channel strictly reacts to oxygen consumption fluctuation and carbon oxidation velocity with dynamic characteristics, determined by technological parameters of the slag phase. The theoretical basis of use of periodic impacts in the channel purging oxygen consumption – carbon oxidation velocity” channel is presented. Proposed purge management method allows to completely rid the process from emissions probability, improves the assimilation of sulfur and phosphorus contaminants in slag phase, decreases metallic phase losses, and stabilizes the purging process on the whole. The results are confirmed by industrial exploitation. The major issue of the designed method industrial application is to ensure normal technical operations of exhaust gases path (primarily, exhaust gases volume regulation system).

INFORMATION TECHNOLOGIES AND AUTOMATIC CONTROL IN FERROUS METALLURGY

48-55 591
Abstract

Ensemble of processing route’s plotting of pipes’ manufacture by the cold straining method is described in report 1. Various combinations of cold rolling and wire drawing when processing route’s plotting allow efficient staff to react flexibly when solving disoutable matters during the manu- facturing process. The dynamic programming method  allowed to implement the procedure of constructing various suboptimal alternative routes options which ensure a flexible choice of acceptable operational solutions.

55-59 558
Abstract

In work are submitted data on development and use of a computer control system by a mode of burning of fuel on rotating furnaces of roasting limestone. The analysis of skilled data testifies to efficiency and reliability of use of this system for optimization of a mode of burning fuel in rotating furnaces that allows to improve technical and economic and power-ecological indicators of lime production.

 

60-64 693
Abstract

On the basis of results of computer modeling in program complex Deform 3D the possibility of production of hollow wheel billets from pipes obtained by helical rolling mills are shown. Results of modeling operations of screw broaching large ingots on a two-roll helical rolling mill are presented.

SHORT REPORTS

65-66 558
Abstract

Kinetic absorption of nitrogen and oxygen was simultaneous investigated in liquid iron alloys with capillary method from gas phase. For determi- nation of characteristic process of kinetic absorption (diffusion coefficient and rate constant of surface reaction) was be used in diffusion with bound- ary layer third equation by experimental computation of given data. Dependence of diffusion coefficient on chemical composition was determined. Dependence of rate constant of absorption of nitrogen from gas phase in chemical reaction process on interfacial surface compound was determined.

67-68 455
Abstract

The study suggests that the active processes of red mud pellets for hardening stages of solid-and liquid-phase sintering.

68-70 621
Abstract
By scanning electron microscopy and microhardness measurement the characteristics affecting the structure zone electroexplosive carbobo- ronizing commercially pure titanium VT1-0 repetitively pulsed electron-beam treatment are investigated. The treatment leads to a smoothing of the surface relief and high gradient of microhardness in the thin surface layer. The level of microhardness on depth of hardening zone decreases, but the depth of hardening zone increases.


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