Imeni Vladimira Il'icha Lenina, Russia
Imeni Vladimira Il'icha Lenina, Russia

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Pesin A.,Magnitogorsk State Technical University | Pustovoytov D.,Magnitogorsk State Technical University
MATEC Web of Conferences | Year: 2016

Asymmetrical sheet rolling is a method of severe plastic deformation (SPD) for production of aluminium alloys with UFG structure. Prediction of sheet temperature during SPD is important. The temperature of sheet is changed due to the conversion of mechanical work into heat through sliding on contact surfaces and high shear strain. Paper presents the results of FEM simulation of the effect of contact friction, rolling speed and rolls speed ratio on the heating of aluminium sheets during asymmetrical rolling. © The Authors, published by EDP Sciences, 2016.


Kinzin D.I.,Magnitogorsk State Technical University
Steel in Translation | Year: 2014

A single formula is derived for the broadening in grooves of different shapes. On that basis, the groove design may be optimized so as to maximize the efficiency of deformation, by means of optimal control theory. Numerical results of optimization are presented. © 2014 Allerton Press, Inc.


Medyanik N.L.,Magnitogorsk State Technical University
Coke and Chemistry | Year: 2011

The activity of reagents in coal flotation may be assessed on the basis of quantum-chemical descriptors. Semiempirical calculations indicate that hard electrophilic centers in the coal surface correspond to carbon atoms with maximum positive charge. The oxygen atoms are nucleophilic centers of complex terephthalates, which are characterized by maximum negative charges and therefore able to form donoracceptor complexes with electrophilic sections of the coal surface. The reaction corresponds to a charge-controlled mechanism. © 2011 Allerton Press, Inc.


Savinov A.S.,Magnitogorsk State Technical University
Steel in Translation | Year: 2016

A mathematical model is developed for the stress state of a casting when a cavity is formed by a cylindrical rod. Formulas for the radial and azimuthal stresses and also the contact-force distribution permit prediction of the forces between the casting and the rod, with different rigidities expressed by the longitudinal elastic modulus. The stress is found to be greatest in layers of the casting in contact with the rod surface. The dependence of the radial and azimuthal stresses in the casting and the distributed contact force on various factors—the temperature gradient, the rigidity of the casting and the sand–clay casting mixture, and the geometric parameters of the casting (the wall thickness and external radius)—is considered. The influence of these factors on the stress–strain state of the casting wall—specifically, the equivalent stress obtained by means of the second strength hypothesis—is assessed. © 2016, Allerton Press, Inc.


Pesin A.,Magnitogorsk State Technical University | Pustovoytov D.,Magnitogorsk State Technical University
Journal of Materials Processing Technology | Year: 2015

For hot-rolled flat products major losses of steel are due to surface defects, which are caused by the quality of an incoming continuous cast slab. Each typical surface defect of a continuous cast slab if not detected and eliminated transforms into a surface defect of a rolled plate. One of the most critical problems of hot rolled plates is connected with the longitudinal surface cracks located at the distance up to 80 mm from the edges. This study covers the research and simulation of transformation of surface cracks into the edge defects of the hot-rolled plate by finite element method. It is shown that the mechanism of crack movement during plate rolling comes from inclination of front and tail faces of slab due to temperature gradient between top and bottom surfaces. To reduce the possibility of corner crack formation it is proposed to increase the temperature of the edge zone of the slab due to the rounding of edges or by induction heating. The results of the study will be useful for material saving during plate rolling. © 2015 Elsevier B.V. All rights reserved.


Yachikov I.M.,Magnitogorsk State Technical University
Magnetohydrodynamics | Year: 2016

In steel-making facilities, where a current-carrying melt is used, it seems promising to use electriovortex stirring which is driven by volume electromagnetic forces generated by the interaction of currents and their self magnetic fields and initiates electrovortex flows. Mathematical models and algorithms are used to calculate the electrovortex flows and heat/mass transfer parameters in current-carrying melts in liquid metal baths of the melting facilities with axisymmetric electric current distribution. Computer modelling of electrovortex flow parameters and sulphur content has been made for a 3-ton steel-making bath of the DC arc furnace for a one-slag refining cycle. The melt heating rate and the minimum time of the desulphurization process well as the mean integral parameters of heat/mass transfer by the bath capacity have been calculated.


Chernyshova E.P.,Magnitogorsk State Technical University
Advances in Environmental Biology | Year: 2014

This work deals with philosophical, artistic, psychological and ergonomic aspects of forming the architectural designer's colour solution of the urban environment. Examples of historical and contemporary attempts to solve this problem are given. © 2014 AENSI Publisher All rights reserved.


Rumjancev M.,Magnitogorsk State Technical University
METAL 2014 - 23rd International Conference on Metallurgy and Materials, Conference Proceedings | Year: 2014

The developing of working patterns of rolling is very important to create and update a technology of producing steel strips. In addition, it used in estimation a possibility of equipment for producing new gages of steel strip. We used the invariable method to designing the pattern of rolling, which based in automatical computerassistant engineering. With help this method we have calculated rational total strain amount and rolling speed with maximum productivity for different kinds of steel grades on PLTCM 2000 (picking line tandem cold mill). For examples, to produce on PLTCM 2000 low carbon and ultralow carbon steels (DC01-DC04, HC180Y and analogue) with total strain amount about 85 % rational rolling speed calculated about 16.5-17 m×s-1. According to equipment's specification PLTCM, maximum rolling speed not more than 25 m×s-1. The limitation was a picking speed. To produce HSLA steels (HC260LA, HC300LA, HC340LA and analogue) with total strain amount about 80 % rational cold rolling speed calculated about 16-18.5 m×s-1. According to accounts Cold Roll, during the cold rolling on PLTCM 2000 these grades with total strain amount 75-85 % the limitation was a high-temperature stability of rolling emulsion. To produce HSLA steels with total strain less 75 % the limitation was a picking speed. To produce HSLA steels (HC420LA, HX420LAD and analogue) rational total strain amount was about 67 - 70 %, cold rolling speed - 13 - 15 m×s-1. To produced high strength steels (HTC980X, HTD1200M and analogue) rational strain amount was about 58 - 63 %, cold rolling speed - 7.5 - 10 m×s-1. In last two examples, limitations were a pickling speed.


Permjakov M.B.,Magnitogorsk State Technical University
Advances in Environmental Biology | Year: 2014

This work proposes the author's method of building residual life calculation with metal frames. A flowchart on resource assessment and the calculation of emergency collapse risks was developed. The technique allows to set a term of building residual resource prior to overhaul or decommissioning. 2014 AENSI Publisher All rights reserved.


Permyakov M.B.,Magnitogorsk State Technical University
Advances in Environmental Biology | Year: 2014

This paper proposed several methods of building residual life calculation, the results on the basis of which the life assessment of certain structural elements or the entire building is performed. The timely evaluation of building technical condition allows you to determine a building residual life prior to overhaul or decommissioning. © 2014 AENSI Publisher All rights reserved.

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