Determination of the coefficient of variation of the fatigue limit of parts hardened by surface plastic deformation

1987 ◽  
Vol 19 (7) ◽  
pp. 922-925
Author(s):  
L. M. Belkin ◽  
A. A. Samoilov
Keyword(s):  
Plastic Deformation ◽  
Fatigue Limit ◽  
Coefficient Of Variation ◽  
Surface Plastic Deformation ◽  
Surface Plastic

Determination of the Energy Parameters of the Shock Mechanism Used to Harden the Surface by Plastic Deformation

2015 ◽  
Vol 756 ◽  
pp. 85-91 ◽  
Author(s):  
A. Kirichek ◽  
S.A. Silant’ev
Keyword(s):  
Plastic Deformation ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Energy Characteristics ◽  
Measuring Methods ◽  
Energy Parameters ◽  
Shock Mechanism

The possibilities of application of various designs of shock mechanisms for hardening by surface plastic deformation were considered. The measuring methods of their energy characteristics were shown.

scholarly journals Method of Determination of Technological Durabilityof Plastically Deformed Sheet Parts of Vehicles

2018 ◽  
Vol 7 (4.3) ◽  
pp. 92 ◽  
Author(s):  
Volodymyr Dragobetskii ◽  
Mykhaylo Zagirnyak ◽  
Olena Naumova ◽  
Sergii Shlyk ◽  
Aleksandr Shapoval
Keyword(s):  
Plastic Deformation ◽  
Technological Process ◽  
Weld Zone ◽  
Surface Plastic Deformation ◽  
Design Stage ◽  
Surface Plastic ◽  
Preliminary Deformation ◽  
Nonstationary Field ◽  
Plastic Forming

The purpose of the article is to develop an apparatus providing maximum or predicted durability of parts treated during their manufacture by plastic deformation. In these terms, the parameters of the technological process should provide the maximum or expected increase of the endurance limit in comparison with the initial parts values before the strengthening by the surface plastic deformation or after plastic forming. The article describes the influence of the degree of preliminary deformation on the kinetics of fatigue failure of metals and alloys. Experimental data of the ultimate deformations of welded workpieces were obtained, which make it possible to evaluate the manufacturing of parts with a weld seam at the design stage of the technological process. The developed method made it possible to determine the nonstationary field of stresses in the deformation region, ultimate deformations and the most rational scheme of the stress-strain state, which excludes the localization of deformations and destruction of the weld zone of a welded cylindrical workpieces.  

Influence of structure and properties of surface layer on fatigue durability of hardened steels strengthened by combined electromechanical treatment

2019 ◽  
Vol 62 (6) ◽  
pp. 438-450
Author(s):  
V. P. Bagmutov ◽  
N. G. Dudkina ◽  
I. N. Zakharov ◽  
M. D. Romanenk ◽  
V. V. Chekunov
Keyword(s):  
Plastic Deformation ◽  
Fatigue Limit ◽  
Surface Hardening ◽  
Strain State ◽  
Surface Plastic Deformation ◽  
Carbon Steels ◽  
Surface Plastic ◽  
Surface Microhardness ◽  
Near Surface ◽  
Surface Metal

Using the example of hardened carbon steels (steel 45, U8), the effect of combination of various surface hardening technologies is considered (using electromechanical processing, surface plastic deformation, non-abrasive ultrasonic finishing and their combination) on changes in structural state and surface microhardness, cyclic durability of hardened specimens and fatigue failure mechanisms. The studies were carried out by the methods of optical and scanning electron microscopy and by microhardness and fatigue tests. It is shown that for the investigated steels in quenched state, a high-speed pulsed thermo-deformation effect during electromechanical processing is accompanied by an increase in the surface microhardness (by more than 50 %) and decrease in the fatigue limit (by 20 – 30 %). Such a change in properties is associated with formation in the surface layer of substantially non-equilibrium, inhomogeneous in chemical composition, ultradispersed phases with increased hardness. At the same time, in the near-surface metal volumes tempering processes of the hardened structure proceed with the formation of softening zones and tensile residual stresses, accompanied by a decrease in the microhardness in these zones and the fatigue limit of the specimens. Such effects reduce some of the materials performance characteristics during surface hardening. The ways to improve the properties of such products due to additional technological operations require further studies. Combined surface hardening (based on electromechanical processing, surface plastic deformation and non-abrasive ultrasonic finishing) of carbon steels allows, due to variations in the intensity of temperature and deformation effects, to purposefully change the structural-phase composition and stress-strain state of the surface and near-surface metal layers. As a result, it becomes possible to form a balanced complex of strength and fatigue characteristics of the samples, depending on the preliminary heat treatment of steel. The operations of surface plastic deformation and non-abrasive ultrasonic finishing after electromechanical hardening, due to intensive plastic deformation provide smoothing of the surface and healing of near-surface defects and allow correction of stress-strain state of the processed metal. It provides an increase in microhardness in the tempering zone by 20 – 25 % and the fatigue limit of the samples by 25 – 30 %. 

New methods for surface plastic deformation of low-rigidity cylindrical machine parts

2018 ◽  
Vol 2018 (8) ◽  
pp. 16-24 ◽  
Author(s):  
Семен Зайдес ◽  
Semen Zaides
Keyword(s):  
Plastic Deformation ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
High Productivity ◽  
Surface Strengthening ◽  
New Methods ◽  
Machine Parts

Technological potentialities at finish-strengthening processing of low-rigid parts of shaft- and axle types with local ways of machining impact are rather limited. In the paper there are considered new ways for strengthening allowing obtaining qualitative surface strengthening in machine parts at high productivity of an engineering procedure.

Plastic deformation of collector plates at electric motor repair

2020 ◽  
pp. 79-82
Author(s):  
D.YU. Belan ◽  
G.B. Toder ◽  
K.V. Averkov ◽  
YU.V. Titov
Keyword(s):  
Plastic Deformation ◽  
Electric Motor ◽  
Roughness Parameter ◽  
Surface Plastic Deformation ◽  
Analytical Dependence ◽  
Surface Plastic ◽  
Machined Surface ◽  
Tool Surface ◽  
Diamond Burnishing ◽  
Traction Electric Motor

A tool was developed for smoothing the plates of an electric motor collector. An analytical dependence of the roughness parameter of the machined surface on the force applied to the tool is obtained. Keywords traction electric motor, collector, diamond burnishing tool, surface-plastic deformation, repair, roughness. [email protected]

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