Effect of residual stresses in surface layers on the properties of steel 30KhGSA

1987 ◽  
Vol 29 (4) ◽  
pp. 258-261
Author(s):  
V. A. Cheremkhin
Keyword(s):  
Residual Stresses ◽  
Surface Layers ◽  
Steel 30Khgsa

Fatigue Life Improvement of Welded Elements and Structures by Ultrasonic Impact Treatment

2011 ◽  
Author(s):  
Yuriy Kudryavtsev ◽  
Jacob Kleiman
Keyword(s):  
Mechanical Properties ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Residual Stresses ◽  
Fatigue Testing ◽  
Highway Bridges ◽  
Surface Layers ◽  
Ultrasonic Impact Treatment ◽  
Stress Relieving ◽  
Life Improvement

The ultrasonic impact treatment (UIT) is relatively new and promising process for fatigue life improvement of welded elements and structures. In most industrial applications this process is known as ultrasonic peening (UP). The beneficial effect of UIT/UP is achieved mainly by relieving of harmful tensile residual stresses and introducing of compressive residual stresses into surface layers of a material, decreasing of stress concentration in weld toe zones and enhancement of mechanical properties of the surface layers of the material. The UP technique is based on the combined effect of high frequency impacts of special strikers and ultrasonic oscillations in treated material. Fatigue testing of welded specimens showed that UP is the most efficient improvement treatment as compared with traditional techniques such as grinding, TIG-dressing, heat treatment, hammer peening and application of LTT electrodes. The developed computerized complex for UP was successfully applied for increasing the fatigue life and corrosion resistance of welded elements, elimination of distortions caused by welding and other technological processes, residual stress relieving, increasing of the hardness of the surface of materials. The UP could be effectively applied for fatigue life improvement during manufacturing, rehabilitation and repair of welded elements and structures. The areas/industries where the UP process was applied successfully include: Shipbuilding, Railway and Highway Bridges, Construction Equipment, Mining, Automotive, Aerospace. The results of fatigue testing of welded elements in as-welded condition and after application of UP are considered in this paper. It is shown that UP is the most effective and economic technique for increasing of fatigue strength of welded elements in materials of different strength. These results also show a strong tendency of increasing of fatigue strength of welded elements after application of UP with the increase in mechanical properties of the material used.

Structural transformation and residual stresses in surface layers of α + β titanium alloys nanotextured by femtosecond laser pulses

2014 ◽  
Vol 119 (1) ◽  
pp. 241-247 ◽  
Author(s):  
Yu. R. Kolobov ◽  
E. V. Golosov ◽  
T. N. Vershinina ◽  
M. V. Zhidkov ◽  
A. A. Ionin ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Residual Stresses ◽  
Titanium Alloys ◽  
Structural Transformation ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Surface Layers

scholarly journals Fatigue improvement of welded elements by ultrasonic impact treatment

2020 ◽  
Vol 65 (4) ◽  
pp. 179-190
Author(s):  
Yuir Kudryavtsev
Keyword(s):  
Mechanical Properties ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Residual Stresses ◽  
Large Scale ◽  
Fatigue Testing ◽  
Fatigue Improvement ◽  
Surface Layers ◽  
Ultrasonic Impact Treatment ◽  
Stress Relieving

The ultrasonic impact treatment (UIT) is relatively new and promising process for fatigue life improvement of welded elements and structures. In most industrial applications this process is known as ultrasonic peening (UP). The beneficial effect of UIT/UP is achieved mainly by relieving of tensile residual stresses and introducing of compressive residual stresses into surface layers of a material. The secondary factors in fatigue improvement by UIT/UP are decreasing of stress concentration in weld toe zones and enhancement of mechanical properties of the surface layers of the material. Fatigue testing of welded specimens showed that UIT/UP is the most efficient improvement treatment as compared with traditional techniques such as grinding, TIG-dressing, heat treatment, hammer peening and application of LTT electrodes. The developed computerized complex for UIT/UP was successfully applied for increasing the fatigue life and corrosion resistance of welded elements, elimination of distortions caused by welding and other technological processes, residual stress relieving, increasing of the hardness of the surface of materials. The results of fatigue testing of large-scale welded specimens in as-welded condition and after application of UIT/UP are considered in this paper. It is shown that UIT/UP is the most effective and economic technique for increasing of fatigue strength of welded elements in materials of different strength. These results also show a strong tendency of increasing of fatigue strength of welded elements after application of UP with the increase in mechanical properties of the material used.

Residual Stress Analysis of Austenitic Steel Designed for Nuclear Energetics in Surface Layers

2016 ◽  
Vol 827 ◽  
pp. 125-128 ◽  
Author(s):  
Andrej Czan ◽  
Michal Sajgalik ◽  
Anton Martikan ◽  
Viktor Kuzdak
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Chemical Properties ◽  
Steel Sample ◽  
Stainless Steel Sample ◽  
X Ray Diffraction ◽  
Surface Layers ◽  
Measured Sample ◽  
Non Destructive ◽  
And Chemical Properties

Monitoring of residual stresses in components can be useful in predicting damage incidences caused by workload over lifetime of components. Non-destructive measuring and evaluation of residual stresses and chemical properties of stainless steel sample and its possibility to affect functional properties of the material by using the X-ray diffraction has some advantages. Measured sample or part does not require special preparation or destruction and so it is capable to operate after measuring. This method also determines orientation of residual stress, so it is possible to identify absolute values of shear and normal stress with high accuracy.

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