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.
Chikishev D.,Magnitogorsk State Technical University |
Pozhidaeva E.,Magnitogorsk State Technical University
International Journal of Advanced Manufacturing Technology | Year: 2017
Methods of economical alloying of high pipe steels were considered in the paper. Due to the large environmental, energy, and economic issues in the destruction of the pipeline, the quality of steel pipes is very important. The method described in this article is considered to be relevant not only for pipe steels but also for high-strength steels used in shipbuilding, bridge construction, etc. Review mechanisms of strengthening microalloyed steels were carried out in this work. Schema evolution of the microstructure of microalloyed steels was discussed. The influence of alloying elements in steel by means of optimal process parameters of thermomechanical rolling was analyzed. There are two methods of mathematical modeling used in the study: artificial neural networks (ANNs) which are based on the multilayered perceptron to select the optimal chemical composition and finite element analysis to optimize the process parameters. An experimental dataset was used to train multilayer perceptron (MLP) networks to allow for prediction of the yield strength, tensile strength, and elongation of steel. Due to large availability, low cost, and high accuracy of the results, these methods are considered to be the most promising ones. The mathematical model for calculating mechanical properties of a rolling pipe has been developed. Two ways to reduce the cost of a hot-rolled plate made of microalloyed steels were developed. There has been developed the complex of replacement technological impact which can make it possible to replace or reduce the amount of expensive chemical elements (vanadium, nickel, copper, manganese, chromium, and niobium) without loss of quality. © 2017 Springer-Verlag London
Polyakova M.,Magnitogorsk State Technical University |
Rubin G.,Magnitogorsk State Technical University
AIP Conference Proceedings | Year: 2017
Modern theory of technological and economical development is based on long-term cycles. So far it has been proved that the technological structure of the economy can be subdivided into groups of technological complexes, which are inter-related with each other by similar technological links, so called technological modes. Technological mode is defined as a complex of interrelated production units of similar technological level, which develop simultaneously. In order to provide competitiveness of products in the new changing conditions, it is necessary to make sure that they meet all the regulatory requirements specified in standards. But the existing and the fast changing situation on the merchandise markets causes disbalance between the growing customer requirements and the technological capabilities of the manufacturer. This makes the issue of standardization development even more urgent both from the point of view of establishing the current positions and from the point of view of possible promising development trends in technology. In the paper scientific and engineering principles of developing standardization as a science are described. It is shown that further development of standardization is based on the principles of advanced standardization the main idea of which is to set up the prospective requirements to the innovative product. Modern approaches of advanced standardization are shown in this paper. The complexity of the negotiation procedure between customer and manufacturer as a whole and achieving of consensus, in particular, make it necessary to find conceptually new approaches to developing mathematical models. The developed methodology picture the process of achieving the consensus between customer and manufacturer while developing the standard norms in the form of decreasing S-curve diagram. It means that in the end of the negotiation process, there is no difference between customer and manufacturer positions. It makes it possible to provide the basics of the assessment using the differential equation of the relationship between the rate of change of quality assessment and the distance of the estimated parameter value from the best value to the worst one. The obtained mathematical model can be used in the practice of standardization decreasing time of setting standard norms. © 2017 Author(s).
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.
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.