scholarly journals Technological support of carrying layer parameters by deformation and combined strengthening

2018 ◽  
Vol 2018 (10) ◽  
pp. 43-48 ◽  
Author(s):  
Андрей Киричек ◽  
Andrey Kirichek ◽  
Дмитрий Соловьев ◽  
Dmitry Soloviyov ◽  
Александр Хандожко ◽  
...  
Keyword(s):  
High Strength ◽  
Surface Plastic Deformation ◽  
Case Hardening ◽  
Surface Plastic ◽  
Heterogeneous Structure ◽  
Technological Support ◽  
Wave Deformation ◽  
Wide Range ◽  
Deposited Metal ◽  
Combined Impact

A promising direction of strengthening development is a combined strengthening by a surface plastic deformation with the further case hardening. There are considered possibilities for the creation of a multilayer heterogeneous structure with high strength and operation characteristics by a combined impact with a deformation wave and case hardening. The investigation results of the wave deformation strengthening of deposited metal allowing the support of a considerably higher level of material mechanical and operation properties as compared with rolled metal are presented. The results obtained allow recommending a wave deformation strengthening and combined technologies on its basis for operation properties increase of machinery in a wide range.

Improving the efficiency of electromechanical processing by surface plastic deformation

2021 ◽  
pp. 16-22
Author(s):  
N.G. Dudkina ◽  
I.N. Zakharov ◽  
V. V. Barinov
Keyword(s):  
Plastic Deformation ◽  
Surface Plastic Deformation ◽  
Carbon Steels ◽  
Scientific School ◽  
Surface Plastic ◽  
State Technical ◽  
Effective Combination ◽  
Wide Range ◽  
Long Time ◽  
Selection Of

The article provides an overview of the experimental research developments of the recent years of the scientific school of the Volgograd State Technical University in the field of combined surface hardening of metals by electromechanical processing (EMP) in combination with surface plastic deformation (SPD). For a long time, the authors have been developing a scientifically based approach to the selection of an effective combination of technological effects based on electromechanical processing using surface plastic deformation on the surface layer of medium- and high-carbon steels. The advantage of the combined technologies based on EMP is the possibility to control the quality, structure, physical-mechanical and operational properties within a wide range by changing the hardening modes.

scholarly journals Relaxation patterns of technological residual voltage in the surface layer of high-strength steel when cyclically loaded

2021 ◽  
Vol 244 ◽  
pp. 04001
Author(s):  
Georgi Kravchenko ◽  
Konstantin Kravchenko ◽  
Andrey Smolyaninov ◽  
Irina Kudryavtseva
Keyword(s):  
Surface Layer ◽  
Residual Stresses ◽  
Construction Materials ◽  
High Strength ◽  
Surface Plastic Deformation ◽  
Variable Pressure ◽  
Surface Plastic ◽  
Initial Value ◽  
Residual Voltage ◽  
Compressive Stresses

Experimentally investigated patterns of changes in technological residual stresses under the influence of variable pressure in the surface layer became 30XNS2A. A mathematical model of relaxation of residual compressive stresses created by surface plastic deformation techniques with symmetrical cyclical bending of samples has been proposed. An empirical expression is proposed for assessing the final value of residual stresses as a result of cyclic loading, depending on the stress amplitude of a symmetric cycle. An expression is given for estimating the coefficient of relaxation rate of residual compressive stresses from their initial value, amplitude of alternating stresses and material properties. The constants of these expressions are determined for various construction materials. The theoretical dependences describe well the obtained experimental data. To predict the level of residual stress realization under operational loading, a formula was obtained to calculate their change as a result of the action of a step loading block with different amplitudes and duration of their action at each of the stages.

Technological Parameters Forming the Surface Texture in Hyper Productive Surface Plastic Deformation Processing

2017 ◽  
Vol 746 ◽  
pp. 114-119 ◽  
Author(s):  
Sergey N. Grigoriev ◽  
N.M. Bobrovskij ◽  
I.N. Bobrovskij ◽  
Cho-Pei Jiang
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Cast Iron ◽  
Surface Texture ◽  
Processing Time ◽  
High Strength ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Deformation Processing ◽  
Productive Surface

The hyper productive surface plastic deformation processing technology called as wide burnishing (WB) was developed in Russian Federation. The mechanics of new WB technology is different from the classic SPD technologies (rolling or burnishing). For example applied force during processing of burnishing is 150-300 N, of WB is 2500-5000 N due to condition of process implementation in mass production with limited processing time (3-4 turnovers of workpiece). WB also has a high degree of deformation due to a multiple deformation passes. To determine the optimal WB processing parameters single and double instrumental devices were implemented and tested. Specimens made of steel 40 and high-strength cast iron 75-50-03 were tested. Initial roughness of steel 40 specimen’s surface was Ra = 0.5 microns and high-strength cast iron was Ra = 0.85 microns. Results of surface texture parameters of processed parts such as surface roughness Ra of steel 40 and high-strength cast iron 75-50-03 under varying load values P and number of cycles (the number of workpieces revolutions during the period of burnishing) were acquired. It was established that the minimum Ra value of the processed surface correspond with values of P = 210 N/mm2 for steel 40 and P = 410 N/mm2 for high-strength cast iron 75-50-03 regardless of number of burnishing cycles. Plastic deformation mechanism (processing time and pressure on the surface) influences on the processed surface roughness formation. It is possible to assume that straining state forms at the optimal values of P in terms of achieving a minimum value of Ra in which the reached degree of hardening allows to minimize the height of the microscopic irregularities of the previous grinding processing. In this case there is no plastic flow of the metal surface layer.

Development of Parameters Describing Heterogeneous Hardened Structure

2015 ◽  
Vol 756 ◽  
pp. 75-78 ◽  
Author(s):  
A. Kirichek ◽  
S.V. Barinov
Keyword(s):  
Surface Layer ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Heterogeneous Structure ◽  
Treatment Technique ◽  
Pulse Treatment ◽  
Precise Adjustment ◽  
Surface Layer Hardening ◽  
Definition Of ◽  
Hardened Surface

The technique was developed with the purpose of definition of parameters for surface layer uniformity after mechanical hardening. It was found that one of the most effective methods of surface plastic deformation that provide precise adjustment of uniformity level of surface layer hardening is presented by static-pulse treatment technique. This method helps to develop hardened surface layer 8 mm deep with virtually uniform or heterogeneous structure.

scholarly journals HETEROGENEOUS HARDENING OF MACHINES PARTS BY SURFACE PLASTIC DEFORMATION

2019 ◽  
pp. 106-112
Author(s):  
А. Афонин ◽  
A. Afonin ◽  
Е. Мартынов ◽  
E. Martynov ◽  
А.В. Макаров ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Fatigue Loading ◽  
Hardened Layer ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Heterogeneous Structure ◽  
The Finite Element Method ◽  
Operational Characteristics ◽  
Machine Parts

The main causes of failure of heavily loaded threads are considered. The methods of increasing the efficiency of the equipment due to the method used are proposed. It is found that improving the operational characteristics of the components of mining and metallurgical machinery can be achieved forming heterogeneous-hardened surface layer. Methods of forming heterogeneous structure by surface plastic deformation (SPD are considered). The importance of identifying the nature of the influence of parameters of heterogeneous hardened layer on the performance of machine parts is indicated. Modeling of process heterogeneous hardening of SPD of the finite element method is executed. Recommendations about application of heterogeneous hardening of SPD for hardening the heavy-duty parts are offered. It is found that the use of different methods SPD allows widely vary the degree of depth and the uniformity of the hardening of machine parts. It is found that this increase in life responsible highly loaded parts operating under fatigue loading due to hardening of the heterogeneous surface layer may reach 1.5 times or more.

scholarly journals Evaluating the Homogeneity of Surface Features Induced by Impact-Based Surface Treatments

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3476
Author(s):  
Asghar Heydari Astaraee ◽  
Sara Bagherifard ◽  
Stefano Monti ◽  
Mario Guagliano
Keyword(s):  
Surface Roughness ◽  
Morphological Characteristics ◽  
Surface Plastic Deformation ◽  
Surface Treatments ◽  
Surface Plastic ◽  
Roughness Parameters ◽  
Surface Features ◽  
Impact Surface ◽  
Surface Roughness Parameters ◽  
Wide Range

Impact surface treatments are well-known for their efficiency in enhancing the mechanical properties of metallic materials, especially under cyclic loadings. These processes, which encompass a wide range of surface treatments based on repetitive impacts of tools of various types, induce surface plastic deformation, compressive residual stresses, and grain refinement alter the surface roughness as a side effect. Thus, it is essential to have suitable indexes to quantify the surface features caused by the typically random nature of these treatments. Herein, we evaluated the rationality of using standard roughness parameters for describing the morphological characteristics of surfaces treated by shot peening as a representative and widely used treatment of the category. A detailed numerical model of the peening process was developed. The output data were elaborated to extract the surface roughness parameters following the standard procedures. The results revealed the validity of the surface roughness parameters to describe the topography of material treated with adequate surface coverage, also highlighting the necessity to use a set of parameters rather than the common practice of relying on single parameters. Not considering a comprehensive set of amplitude and spacing parameters can result in significant, inconsistent, and misleading results while comparing the performance of surfaces.

Testing of External Cylindrical Surfaces of Car Parts after Wide Burnishing Processing

2017 ◽  
Vol 746 ◽  
pp. 126-131 ◽  
Author(s):  
Sergey N. Grigoriev ◽  
N.M. Bobrovskij ◽  
I.N. Bobrovskij ◽  
Aleksey A. Lukyanov ◽  
Abdumalik Rakhimovich Seitkulov
Keyword(s):  
Roughness Parameter ◽  
High Strength ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Real Surface ◽  
Test Results ◽  
Cross Sectional ◽  
Process Implementation ◽  
Lip Seals ◽  
Multiple Deformation

The hyper productive surface plastic deformation processing technology called as wide burnishing (WB) was developed in Russian Federation. The mechanics of new WB technology is different from the classic SPD technologies (rolling or burnishing). For example applied force during processing of burnishing is 150-300 N, of WB is 2500-5000 N due to condition of process implementation in mass production with limited processing time (3-4 turnovers of workpiece). WB also has a high degree of deformation due to a multiple deformation passes. The requirement to develop the methodology for testing “Gland neck parts of the car LADA processed by various methods” was caused by the fact that the previously carried out bench tests do not reproduce the real surface of necks shafts working in pair with lip seals. As well there was no methodology for measuring the value of the gland neck wear and the maximum value of the wear grooves was defined of 1.0 mm. Specimens reproducing gland neck in two of the most critical parts were tested: flange of cardan shaft mounting to the drive shaft of the gear box made of steel 40 and crankshaft made of high-strength cast iron 75-50-03 of LADA car. Test results of specimens made of steel 40 presented the surface roughness parameter Ra = 0.06 microns after burnishing and Ra = 0.28 microns after polishing. The test results were measured on profilograph and were obtained the following data: the width of the grooves wear was 936 microns with burnishing and 1152 microns with polishing, depth was 2.16 and 4.94 microns respectively. Size of cross-sectional area of specimen’s groove wear with burnishing - 1090 um2, with polishing - 2848 um2.

scholarly journals Technology of combined strengthening by wave deformation and case-hardening of structural low-alloy steels

2017 ◽  
Vol 2 (8) ◽  
pp. 30-35 ◽  
Author(s):  
Андрей Киричек ◽  
Andrey Kirichek ◽  
Дмитрий Соловьев ◽  
Dmitry Soloviyov ◽  
Сергей Силантьев ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Thermal Treatment ◽  
Surface Plastic Deformation ◽  
Case Hardening ◽  
Surface Plastic ◽  
Low Alloy Steels ◽  
Deformation Wave ◽  
Promising Direction ◽  
Hardened Alloy ◽  
Alloy Steels

The promising direction of strengthening development is a combined strengthening with surface plastic deformation with the further chemical-thermal treatment, in particular, with case-hardening. The technological possibilities of combined strengthening by a deformation wave with the further case-hardening of structural mild low-alloy steels by the example of steel 10ChSND are considered. It is defined that the results, obtained as a result of combined strengthening, are comparable with the results of strengthening of case-hardened alloy steels used for manufacturing heavy loaded parts of machines.

Theoretical study of the prestressing strand's stress by computer modeling methods

2020 ◽  
Vol 76 (11) ◽  
pp. 1139-1148
Author(s):  
A. G. Korchunov ◽  
E. M. Medvedeva ◽  
E. M. Golubchik
Keyword(s):  
Residual Stresses ◽  
High Strength ◽  
Pearlitic Steel ◽  
Internal Stresses ◽  
Steel Microstructure ◽  
Compressive Stresses ◽  
Wide Range ◽  
Prestressing Strands ◽  
Increasing Temperature ◽  
Wire Strand

The modern construction industry widely uses reinforced concrete structures, where high-strength prestressing strands are used. Key parameters determining strength and relaxation resistance are a steel microstructure and internal stresses. The aim of the work was a computer research of a stage-by-stage formation of internal stresses during production of prestressing strands of structure 1х7(1+6), 12.5 mm diameter, 1770 MPa strength grade, made of pearlitic steel, as well as study of various modes of mechanical and thermal treatment (MTT) influence on their distribution. To study the effect of every strand manufacturing operation on internal stresses of its wires, the authors developed three models: stranding and reducing a 7-wire strand; straightening of a laid strand, stranding and MTT of a 7-wire strand. It was shown that absolute values of residual stresses and their distribution in a wire used for strands of a specified structure significantly influence performance properties of strands. The use of MTT makes it possible to control in a wide range a redistribution of residual stresses in steel resulting from drawing and strand laying processes. It was established that during drawing of up to 80% degree, compressive stresses of 1100-1200 MPa degree are generated in the central layers of wire. The residual stresses on the wire surface accounted for 450-500 MPa and were tension in nature. The tension within a range of 70 kN to 82 kN combined with a temperature range of 360-380°С contributes to a two-fold decrease in residual stresses both in the central and surface layers of wire. When increasing temperature up to 400°С and maintaining the tension, it is possible to achieve maximum balance of residual stresses. Stranding stresses, whose high values entail failure of lay length and geometry of the studied strand may be fully eliminated only at tension of 82 kN and temperature of 400°С. Otherwise, stranding stresses result in opening of strands.

SELECTION OF THE DRIVE OF THE PULSE GENERATOR FOR WAVE DEFORMATION HARDENING

2020 ◽  
Author(s):  
Andrey Kirichek ◽  
Dmitriy Solovyev
Keyword(s):  
Strain Hardening ◽  
Pulse Generator ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Impact Frequency ◽  
Metal Consumption ◽  
Pulse Generators ◽  
Energy Impact ◽  
Deformation Hardening ◽  
Selection Of

The article is devoted to the analysis of known structures of impact devices used in industry in order to obtain recommendations for their adaptation or when creating new structures for wave strain hardening by surface plastic deformation. The analysis was carried out on the used drive and on the main parameters of impact devices: impact energy, impact frequency, relative metal consumption and efficiency. The options are the best combinations of parameters for electric, pneumatic and hydraulic drives. Recommendations are given on the use of such devices, with appropriate adaptation, as pulse generators for wave strain hardening.

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