Texture Gradients in Shot Peened Ti-2.5Cu

2010 ◽  
Vol 160 ◽  
pp. 141-146 ◽  
Author(s):  
Emad Maawad ◽  
Heinz Günter Brokmeier ◽  
Lothar Wagner
Keyword(s):  
Shot Peening ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
X Rays ◽  
Near Surface ◽  
Deep Impact ◽  
Solution Treated ◽  
Texture Characteristics ◽  
Almen Intensity ◽  
Mechanical Surface

Shot peening is a mechanical surface treatment having a deep impact on the materials which generates beneficial near-surface plastic deformation resulting in changes in peening texture characteristics. The present study aims to investigate the texture gradients in the solution treated (SHT) Ti-2.5Cu after shot peening with Almen intensity of 0.20 mmA. Due to a high transmission and a large beam cross-section of neutrons, texture analysis by neutron diffraction has become the standard method to investigate bulk textures. In contrary, the penetration depth of conventional X-rays is a relatively smaller than that of neutrons. Therefore, it is able to measure texture gradients in some hundred microns from the surface.

Investigation of Deformation Gradients in Surface Zone of Mechanically Surface Treated CuZn30

2007 ◽  
Vol 561-565 ◽  
pp. 2229-2232 ◽  
Author(s):  
Sang Bong Yi ◽  
Tomasz Ludian ◽  
Lothar Wagner
Keyword(s):  
Plastic Deformation ◽  
Shot Peening ◽  
Cold Work ◽  
Local Deformation ◽  
Surface Zone ◽  
Ball Burnishing ◽  
Deformation Degree ◽  
Near Surface ◽  
Ball Size ◽  
Almen Intensity

The deformation degrees in near-surface zones and related microstructural changes in CuZn30 were determined after shot peening and ball-burnishing. The induced depths of plastic deformation increase with Almen intensity and rolling pressure in shot peening and ball-burnishing, respectively. As the ball size in burnishing increases, the depth of plastic deformation also increases. The local degrees of cold work within the affected depths were estimated by comparing micro-hardness values, penetration depths of induced slip bands as well as X-ray diffraction peak widths with those measured in blanks cold rolled to fixed degrees of plastic strain. The results clearly indicate that very high local deformation degrees above 80% are typically induced by mechanical surface treatments in areas very close to the surface with this deformation degree gradually decreasing with increasing distance to the surface. Depending on the intensity of ball-burnishing, deformation degrees still of the order of 10% were observed in regions having distances to the surface of as large as 1000 (m.

scholarly journals The modelling of residual stresses due to surface peening using eigenstrain distributions

2005 ◽  
Vol 40 (8) ◽  
pp. 817-824 ◽  
Author(s):  
A. M Korsunsky
Keyword(s):  
Residual Stresses ◽  
Shot Peening ◽  
Stress Measurement ◽  
Plate Theory ◽  
Measurement Techniques ◽  
Predictive Modelling ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Flexible Plate ◽  
Stress States

The beneficial effect of surface peening (including shot peening, laser shock peening, low plasticity burnishing, etc.) on fatigue resistance of structural alloys is well documented and widely used in industry to improve component life. It is perhaps the most widely used technique that relies on the introduction of residual stresses into the component by direct mechanical means. The resulting stress states are usually evaluated experimentally by X-ray diffraction or other stress measurement techniques. In order for shot peening operations to be effective and reliable, the process of introducing residual stresses and strains into peened components must not only be controlled but also be predictable and quantifiable. The present paper establishes a framework for predictive modelling of the residual stress states due to surface peening. Firstly, uniform (within planes parallel to the surface) plastic deformation of the surface layer taking place during shot peening of a thin plate is simulated using the concept of eigenstrain. As a further demonstration of the capabilities of the proposed approach, flexible plate theory is applied to the analysis of stresses and deformations arising due to local peening within a circular area. The results are of considerable use and significance for the analysis of shot peening and peen forming operations.

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 %. 

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.

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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