scholarly journals Calculation of temperature and thermoelastic stresses in backups with collars of the unit of combined continuous casting and deformation in steel billets production. Report 1

2021 ◽  
Vol 63 (11-12) ◽  
pp. 960-964
Author(s):  
O. S. Lekhov ◽  
A. V. Mikhalev
Keyword(s):  
Temperature Field ◽  
Continuous Casting ◽  
Boundary Conditions ◽  
Contact Layer ◽  
Temperature Fields ◽  
Field Calculation ◽  
Conductivity Equation ◽  
Thermal Conductivity Equation ◽  
Thermoelastic Stresses ◽  
Effective Heat Transfer Coefficient

The article describes the main loads affecting shaped backups of the unit of combined process of continuous casting and deformation in billets production. Importance of determining the temperature fields and thermoelastic stresses in shaped backups with collars is provided at formation of several billets, at slab compression and at idle during water cooling of backups. The authors describe strength and thermophysical properties of steel from which the backups are made. Geometry of backups with collars used for obtaining billets of three different shapes in one pass is shown. Initial data of the temperature field calculation are given for backups with collars of the combined unit. Temperature boundary conditions are considered for calculation of temperature fields of backups with collars. Boundary conditions determining temperature of such backups are described and values of the heat flow and effective heat transfer coefficient are given. The results of calculation of temperature fields are performed in four sections and are given for typical lines and points located on contact surface of backups with collars and in contact layer at depth of 5 mm from the working surface. The sizes of finite elements grid which is used at calculation of temperature field of backups with collars are provided. Temperature field of backups with collars is determined on the basis of solution of unsteady thermal conductivity equation corresponding initial and boundary conditions. Values and regularities of temperature distribution in bases and in tops of the middle and extreme edges of the shaped backups are presented during slab compression and at idle when obtaining billets of three shapes in one pass at the unit of combined continuous casting and deformation.

scholarly journals Stressed state of striker – bimetall system at production of three-layer steel bimetallic strips in the unit of continuous casting and deformation

2020 ◽  
Vol 63 (2) ◽  
pp. 140-145
Author(s):  
O. S. Lekhov ◽  
A. V. Mikhalev ◽  
M. M. Shevelev
Keyword(s):  
Continuous Casting ◽  
Contact Layer ◽  
Temperature Fields ◽  
Temperature Boundary ◽  
Characteristic Lines ◽  
Calculation Results ◽  
Thermoelastic Stresses ◽  
Temperature Loads ◽  
Layer Steel ◽  
Made In

The article presents the initial data for calculation of stress-strain state of a three-layer bimetallic strip. The regularities of distribution of axial and tangent stresses in the zone of cyclic deformation are considered. The main loads acting on the mold strikers are described for the unit of combined continuous casting and deformation at production of steel three-layer bimetallic strips. The authors describe the method for determining total stresses in the installation strikers from the efforts of compression and temperature loads. Also temperature boundary conditions for determining the temperature fields are considered. The procedure for determining temperature fields and thermoelastic stresses in the strikers is shown using the ANSYS package. The calculation results of temperature fields and thermoelastic stresses were made in five sections of the striker and are given for characteristic lines. The nature of temperature distribution over the thickness of the striker is shown when it is cooled with water at idling and in contact with a bimetallic ingot during its compression. For the calculated temperature fields, the authors have determined the axial and equivalent stresses occurring in the strikers without channels when the ingot is compressed and cooled with water during idling. The magnitudes and patterns of distribution of total axial stresses from the compression and thermal loads are also given along the thickness of the contact layer, along the height and thickness of the strikers.

scholarly journals STRESSES IN ANVILS OF VARIOUS CONSTRUCTION OF CONTINUOUS CASTING AND DEFORMATION PLANT AT PRODUCTION OF SHEETS FROM STEEL FOR WELDED PIPES

2019 ◽  
Vol 62 (4) ◽  
pp. 270-275
Author(s):  
O. S. Lekhov ◽  
A. V. Mikhalev ◽  
M. M. Shevelev
Keyword(s):  
Continuous Casting ◽  
Deformation Process ◽  
Comparative Assessment ◽  
Temperature Fields ◽  
Pipe Plant ◽  
Water Cooling ◽  
Advantages And Disadvantages ◽  
Steel Sheets ◽  
Calculation Results ◽  
Thermoelastic Stresses

A comparative assessment of strenuous state of the anvils with and without channels has been carried out for the installation of combined continuous casting and deformation process in the production of steel sheets for welded pipes. The conditions of operation and loading of the anvils of combined continuous casting and deformation process are described. The design of anvil with channels for water cooling and the nature of its loading are given. Using the algorithm for solving problems in the elasticity theory by finite element method, the laws governing the distribution of axial stresses in anvils from the slab reduction force are determined. Effect of the channels for anvils cooling with water on the magnitude and nature of stresses distribution in them from the stress of the slab reduction was estimated. The calculation results of temperature fields and axial and equivalent thermoelastic stresses in anvils with channels are presented for the production process of steel sheets for welded pipes in a combined continuous casting and deformation unit. The article considers regularities of total stresses distribution in anvils with channels. To assess the effect of anvils structure on their stress state, regularities of distribution of thermoelastic and total stresses in strands without channels have been determined. The graph of dependence of thermoelastic stresses in the anvil on temperature of its contact surface is given. Recommendations for choosing the material of the fighters are given. The advantages and disadvantages of the anvils with channels for the unit for combined continuous casting and deformation are described. The parameters of such a pilot installation are presented. The authors also describe the results of an experimental study of the parameters of a combined process at the manufacture installation for continuous casting and deformation of JSC Ural Pipe Plant.

Stress state of anvils of continuous casting and deformation installation during production of steel-copper three-layer bimetallic strips

2020 ◽  
pp. 425-428
Author(s):  
O.S. Lekhov ◽  
M.M. Shevelev
Keyword(s):  
Stress State ◽  
Continuous Casting ◽  
Boundary Conditions ◽  
Thermal Loads ◽  
Combined Process ◽  
Thermoelastic Stresses

The main loads acting on the anvils of installation of the combined process of continuous casting and deformation during the production of steelcopper three-layer bimetallic strips are described. The method for determining of the temperature and thermoelastic stresses in anvils of installation using the ANSYS package is presented. The boundary conditions for determining of the temperature fi elds in anvils of the installation during the production of copper—steel—copper bimetal is described. The regularities of the distribution in anvils of temperature and thermoelastic stresses during reduction of steelcopper bimetallic ingot and at idle are presented. The values and regularities in the distribution of total stresses from the reduction force and thermal loads when producing steelcopper three-layer bimetallic strips on installation of the combined process of continuous casting and deformation are given.

scholarly journals LOAD AND STRAIN STATUS OF CCM BACKUPS AND STRIPE DEFORMATION AT PRODUCTION OF STEEL SHEETS FOR WELDED PIPES. REPORT 2

2018 ◽  
Vol 61 (6) ◽  
pp. 431-438
Author(s):  
O. S. Lekhov ◽  
A. V. Mikhalev ◽  
M. M. Shevelev
Keyword(s):  
Contact Layer ◽  
Temperature Fields ◽  
Transfer Coefficients ◽  
Equivalent Stresses ◽  
Heat Transfer Coefficients ◽  
Steel Sheets ◽  
Temperature Boundary ◽  
Temperature Load ◽  
Thermoelastic Stresses ◽  
Strain Status

The main loads acting on the backup-walls of the assembled  mold of the combined continuous casting and deformation unit in production of steel sheets for welded pipes are described. The technique  for determining the total stresses in backup-walls of the installation of  the compression forces and the temperature load is given. The temperature boundary conditions for determining the temperature fields in  the backup-walls of the assembled mold of the unit for steel sheets for  welded pipes production are depicted. The dependence for determining the heat flux density of the deformation center hot metal influencing working surface of the backup-wall during workpiece drafting is  considered, as well as the technique for determining values   of effective  heat transfer coefficients for backup-walls cooling by water. The procedure for determining temperature fields and thermoelastic stresses  on backup-walls of the installation is described using the ANSYS  package. The article considers the initial data for determining temperature fields and thermoelastic stresses in backup-walls of the assembled  casting mold of the installation. The results of temperature fields and  thermoelastic stresses calculation are achieved in five sections of the  backup-wall and are provided for the typical lines. The nature of temperature distribution along the backup-wall thickness during cooling  by water at idle and at contact with the workpiece during its compression is shown. For the calculated temperature fields, axial and equivalent stresses, that arise in the backup-walls without channels when the  workpiece is drafted and cooled with water at idle, are determined. The  values   and regularities of distribution of axial and equivalent stresses  along the thickness of the contact layer and along the height and thickness of the backup-walls during drafting of the workpiece and at idle  are presented. The values   and regularities of the distribution of total  axial stresses along the thickness of the contact layer, the height and  thickness of the backup-walls from the drafting forces and the temperature load are given.

scholarly journals FORMATION OF TEMPERATURE FIELDS AND THERMAL STRESSES ARISING DURING SOLIDIFICATION OF CYLINDRICAL CONTINUOUSLY CAST STEEL BILLETS

2019 ◽  
Vol 62 (1) ◽  
pp. 57-61 ◽  
Author(s):  
N. A. Krayushkin ◽  
I. A. Pribytkov ◽  
K. S. Shatokhin
Keyword(s):  
Continuous Casting ◽  
Boundary Conditions ◽  
Thermal Stresses ◽  
Cast Steel ◽  
Temperature Fields ◽  
Cast Billet ◽  
Cooling Zone ◽  
Cooling Intensity ◽  
Continuously Cast Billet ◽  
Continuously Cast

The article presents investigation results of the effect of inhomogeneity of boundary conditions on the intensity of metal cooling in the process of continuous casting of cylindrical billets from corrosionresistant steels. It is assumed that the boundary conditions are nonuniform along the billet perimeter. In the longitudinal direction, the cooling intensity is assumed to be constant within the cooled sector of the billet. During the research it was believed that there are flows of thermal energy between the cooling sectors. A comparative analysis of temperature gradients and resulting thermal stresses in the solidified billet at different cooling intensities realized in the secondary cooling zone was carried out The values of thermal stresses are compared with the maximum permissible for each grade of steel in order to find those cooling conditions in which the thermal stresses do not exceed the permissible values. Based on the results obtained, conclusions are drawn about the effect of cooling intensity on the occurrence of external and internal defects in the resulting cylindrical continuous cast billets. The authors have also made the conclusions about the effect of inhomogeneity of the boundary conditions on the formation of temperature fields in a solidified cylindrical continuously cast billet. The results of the conducted studies are presented in a graphic form and their detailed analysis is carried out. To calculate the temperature fields in the solidifying billet, a specially developed mathematical model was used, based on the equation of nonstationary heat conductivity. For the calculation of thermal stresses, known mathematical formulas have been used that allow calculating the values of thermal stresses arising between cooling zones in the solidifying billet during the continuous casting of steel. The obtained data are of high practical importance, since they can be used to develop rational cooling regimes, in which excess permissible thermal stresses will not be observed. This, as a consequence, will reduce the number of internal and external defects arising in the solidifying continuously cast billet.

scholarly journals Determination of Thermophysical Parameters Involved in The Numerical Model to Predict the Temperature Field of Cast-In-Place Concrete Bridge Deck

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3089 ◽  
Author(s):  
Aleksandra Kuryłowicz-Cudowska
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Bridge Deck ◽  
High Performance Concrete ◽  
Temperature History ◽  
Computation Method ◽  
Model Parameters ◽  
Transfer Coefficients ◽  
Conductivity Equation ◽  
Thermal Conductivity Equation

The paper deals with a concept of a practical computation method to simulate the temperature distribution in an extradosed bridge deck. The main goal of the study is to develop a feasible model of hardening of concrete consistent with in-situ measurement capabilities. The presented investigations include laboratory tests of high performance concrete, measurements of temperature evolution in the bridge deck and above all, numerical simulations of temperature field in a concrete box bridge girder. A thermal conductivity equation in the author’s program, using finite difference method has been solved. New approach for identification of the model parameters and boundary conditions (heat transfer coefficients) has been proposed. The numerical results are verified by means of a wide set of experimental tests carried out on three stages of the extradosed bridge studies. A high agreement between the concrete temperature distribution in the time and space domain was obtained. The temperature history of concrete hardening, supplemented with maturity method equations, made it possible to estimate an early-age compressive strength of the cast-in-place concrete. The proposed solution could be applied in a Structural Health Monitoring system for concrete objects.

scholarly journals Calculation of temperature and thermoelastic stresses in backups with collars of the unit of combined continuous casting and deformation in steel billets production. Report 2

2021 ◽  
Vol 64 (2) ◽  
pp. 143-148
Author(s):  
O. S. Lekhov ◽  
A. V. Mikhalev
Keyword(s):  
Stress State ◽  
Continuous Casting ◽  
Contact Surface ◽  
Contact Layer ◽  
Ansys Software ◽  
Problem Statement ◽  
Calculation Results ◽  
Line Passing ◽  
Thermoelastic Stresses

The problem statement and boundary conditions for calculation of axial thermoelastic stresses in backups with collars of the unit of combined continuous casting and deformation are provided for production of three steel billets. The scheme of calculations for determination of thermoelastic stresses in backups with collars in known temperature field was stated using ANSYS software. The results of calculation of thermoelastic stresses in shaped dies were performed in four sections of a backup with collars. In each section, calculation results are given for four typical lines and seven points. Values of axial thermoelastic stresses for seven typical points of each section are given for the contact surface of a backup with collars and the contact layer at a depth of 5 mm from the contact surface. The stress state of a shaped backup in the middle of depression between the middle collars was determined and the regularities of distribution of axial and equivalent stresses over the thickness, length and width of a backup were established during slab compression and at idle. The results of calculation of thermoelastic stresses in the top of the middle collar of a shaped backup on the contact surface and in the contact layer during slab compression and at idle are presented. Graphs of thermoelastic stresses distribution along the line passing through the top of a collar are given, which show the zones of compressive and tensile thermoelastic stresses during slab compression and at idle. The character of the stress state in the base of extreme collar was determined for production of three steel billets in the unit of combined process of continuous casting and deformation.

scholarly journals Distribution of thermophysical and mechanical properties of titanium nickelide in the welding zone

2021 ◽  
Vol 2052 (1) ◽  
pp. 012005
Author(s):  
V V Burkhovetskiy ◽  
A O Kamaev ◽  
A Yu Kiselev ◽  
D V Kurushkin ◽  
V M Khanaev ◽  
...  
Keyword(s):  
Heat Affected Zone ◽  
Titanium Nickelide ◽  
Weld Zone ◽  
Temperature Fields ◽  
Tini Alloy ◽  
Material Structure ◽  
Conductivity Equation ◽  
Universal Machine ◽  
Thermal Conductivity Equation ◽  
Differential Scanning Calorimeters

Abstract The paper analyzes the behavior of the deformation characteristics of welded joints made of TiNi alloy with a shape memory effect. Comparison of the level of tensile strength of welded samples made by the TIG method in an Ar and He atmosphere was carried out using a Instron 5985 universal machine. The study of the material structure in the weld zone and the heat-affected zone was carried out on longitudinal sections using a JSM-6490LV electron microscope. To estimate the mechanical parameters PMT-3 microhardness tester was used. The calorimetric parameters of the welded samples were obtained using a differential scanning calorimeters METTLER TOLEDO 822e and TA Instruments Q20. To analyze the gradient properties at the weld zone and the heat-affected zone, the temperature fields were calculated using the thermal conductivity equation included in the model of the residual stress mechanism.

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