To question of calculated determination of cold-work hardening degree in surface layer of part material during machining

2020 ◽  
pp. 160-163
Author(s):  
V.F. Bezyazychny
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Work Hardening ◽  
Cold Work ◽  
Workpiece Material ◽  
Part Surface ◽  
Tool Cutting

Methodology for calculating of the cold-work hardening degree of the part surface machined by blade tool taking into account the physico-mechanical properties of the workpiece material, the cutting mode, the geometry of the tool cutting part is proposed.

Technological support of physical-mechanical properties surface layer in parts at electro-mechanical finishing

2020 ◽  
Vol 2020 (12) ◽  
pp. 22-30
Author(s):  
Vladimir Fedorov ◽  
Anatoliy Suslov ◽  
Maksim Nagorkin
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Residual Stresses ◽  
Work Hardening ◽  
Mechanical Treatment ◽  
Cold Work ◽  
Alternating Current ◽  
Experimental Investigations ◽  
Processing Factor ◽  
Technological Support

The problems in the parameter formation of cold work hardening and residual stresses of a surface layer in steel 45 parts at electro-mechanical finishing with the use of alternating current are considered. There are presented proce-dures for experimental investigations and their standard results as tables and diagrams. The analysis of processing factor impact upon characteristics under investigation is carried out. The simulators of their formation in the course of processing which can be used in practice are obtained. With the use of the method of simulation there is defined para-metric reliability of the technological system of electro-mechanical treatment on the characteristics of physical-mechanical properties of a surface.

Investigation of the Heat-Affected Zone Properties During Cladding of Power Equipment with Austenitic Materials Using Control Mechanical Impacts on the Strip Electrode

2021 ◽  
Vol 1038 ◽  
pp. 100-107
Author(s):  
Vitaliy Ivanov ◽  
Elena V. Lavrova ◽  
Fedor Morgay ◽  
Oleg Semkiv
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Heat Affected Zone ◽  
Power Equipment ◽  
Low Carbon ◽  
Optimal Range ◽  
Strip Electrode

During cladding an austenitic layer on low-carbon and medium-alloyed steels, the properties of the heat-affected zone, along with the resistance of the surface layer to resist corrosion, largely determine the performance and durability of the surfaced product. The work is devoted to the study of the dependence of the properties of the heat-affected zone during cladding of power equipment with austenitic materials on the parameters of the control mechanical impacts on the strip electrode and determination of their optimal range, which ensures high values of the mechanical properties of the deposited layer.

scholarly journals Effect of Drawing Pass on Softening or Plasticizing of Q235 Steel Bar during Electrochemical Cold Drawing

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 715
Author(s):  
Jangli Guo ◽  
Tijun Chen ◽  
Bo Li
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Dislocation Density ◽  
Fracture Surface ◽  
Work Hardening ◽  
Cold Drawing ◽  
Q235 Steel ◽  
Drawing Stress ◽  
Steel Bar ◽  
Texture Orientation

In this work, the effect of drawing pass on the surface layer softening or plasticizing of Q235 steel bar during electrochemical cold drawing (ECD) was studied, as well as cold drawing in air (DIA) for comparison. The results indicate that the softening or plasticizing degree gradually decreases with increasing drawing pass. The reason for this should be that dislocations generated in surface layer are only partially overflowed from the surface in the form of additional dislocation flux. The general dislocation density thereby gradually increases with the increase in drawing pass, resulting in the increase in the work hardening degree of the surface layer, and thus, the drawing stress. In this case, the texture orientation of the bar surface layer is gradually enhanced. In contrast, the dislocation density, and thus the work hardening degree of DIA bar, are higher than those of the ECD partner, resulting in larger drawing stress. ECD can obtain a product with excellent comprehensive mechanical properties compared with DIA, and there are no cracks on the fracture surface of ECD bar drawn for at least seven passes.

Determination of the endurance limit of the surface layer of a part after processing with a blade tool

2021 ◽  
pp. 56-61
Author(s):  
Keyword(s):  
Surface Roughness ◽  
Surface Layer ◽  
Fatigue Strength ◽  
Residual Stresses ◽  
Quality Indicators ◽  
Work Hardening ◽  
Endurance Limit ◽  
Layer Surface ◽  
Processing Mode

The dependences of the quality indicators of the surface layer of parts on the fatigue strength are analyzed. The dependences are given, taking into account both the quality indicators of the surface layer of the part after processing with the blade tool, and the parameters of the processing mode. Keywords: surface layer, surface roughness, residual stresses, work-hardening depth, endurance limit, blade tool processing. [email protected]

Basic set of experiments for determination of mechanical properties of sand

2014 ◽  
Vol 62 (1) ◽  
pp. 129-137
Author(s):  
A. Sawicki ◽  
J. Mierczyński
Keyword(s):  
Mechanical Properties ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Local Strain ◽  
Initial State ◽  
Laboratory Equipment ◽  
Additional Information ◽  
Basic Set ◽  
Initial Anisotropy

Abstract A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.

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