scholarly journals Erratum to: Phase Composition and Residual Stresses in the Surface Layers of VNS9-Sh TRIP Steel

2021 ◽  
Vol 2021 (4) ◽  
pp. 570-570
Author(s):  
S. Ya. Betsofen ◽  
A. A. Ashmarin ◽  
V. F. Terent’ev ◽  
I. A. Grushin ◽  
M. A. Lebedev
Keyword(s):  
Phase Composition ◽  
Residual Stresses ◽  
Trip Steel ◽  
Surface Layers

Phase Composition and Residual Stresses in the Surface Layers of VNS9-Sh TRIP Steel

2020 ◽  
Vol 2020 (10) ◽  
pp. 1129-1136
Author(s):  
S. Ya. Betsofen ◽  
A. A. Ashmarin ◽  
V. F. Terent’ev ◽  
I. A. Grushin ◽  
M. A. Lebedev
Keyword(s):  
Phase Composition ◽  
Residual Stresses ◽  
Trip Steel ◽  
Surface Layers

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

The structure, phase composition, and residual stresses of diffusion boride layers formed by thermal-chemical treatment on the die steel surface

2021 ◽  
Vol 23 (2) ◽  
pp. 147-162
Author(s):  
Undrakh Mishigdorzhiyn ◽  
◽  
Nikolay Ulakhanov ◽  
Aleksandr Tikhonov ◽  
Pavel Gulyashinov ◽  
...  
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Low Temperature ◽  
Residual Stresses ◽  
Diffusion Layer ◽  
Chemical Treatment ◽  
Steel Surface ◽  
Boron Content ◽  
Die Steel ◽  
Temperature Mode

Introduction. Control and management of technological residual stresses (TRS) are among the most critical mechanical engineering technology tasks. Boriding can provide high physical and mechanical properties of machine parts and tools with minimal impact on the stress state in the surface layers. The purpose of this work is to determine the temperature modes of diffusion boriding, contributing to a favorable distribution of TRS in the surface layer of die steel 3Kh2V8F. The paper considers the results of studies on the TRS determination by the experimental method on the UDION-2 installation in diffusion layers on the studied steel surface. Boriding was carried out in containers with a powder mixture of boron carbide and sodium fluoride as an activator at a temperature of 950 °C and 1050 °C for 2 hours. The obtained samples of steels with a diffusion layer were examined using an optical microscope and a scanning electron microscope (SEM); determined the layers' microhardness, elemental, and phase composition. The experiments resulted in the following findings: as the boriding temperature rose from 950 °C to 1050 °C, the diffusion layer's thickness increased from 20 to 105 μm. The low-temperature mode of thermal-chemical treatment (TCT) led to the formation of iron boride Fe2B with a maximum boron content of 6 % and a microhardness up to 1250 HV. A high-temperature mode resulted in FeB formation with a top boron content of 11 % and a microhardness up to 1880 HV. Results and Discussions. It is found that boriding at 950 °C led to a more favorable distribution of compression TRS in the diffusion layer. However, significant TRS fluctuations in the diffusion layer and the adjacent (transitional) zone could affect the operational properties after TCT at a given temperature. An increase in the TCT temperature led to tensile TRS's appearance in the layer's upper zone at a depth of up to 50 μm from the surface. Despite tensile stresses on the diffusion layer surface after high-temperature TCT, the distribution of TCT is smoother than low-temperature boriding.

scholarly journals Phase composition and residual stresses in thermal barrier coatings

2016 ◽  
Vol 729 ◽  
pp. 012017 ◽  
Author(s):  
A A Lozovan ◽  
S Ya Betsofen ◽  
A A Ashmarin ◽  
B V Ryabenko ◽  
S V Ivanova
Keyword(s):  
Phase Composition ◽  
Residual Stresses ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Barrier Coatings

Phase composition and residual stresses in thermal barrier coatings

2015 ◽  
Vol 2015 (10) ◽  
pp. 795-799 ◽  
Author(s):  
S. Ya. Betsofen ◽  
B. V. Ryabenko ◽  
A. A. Ashmarin ◽  
D. E. Molostov
Keyword(s):  
Phase Composition ◽  
Residual Stresses ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Barrier Coatings
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