Strength enhancement of the welded structures by ultrasonic peening

Abdullah, Amir; Malaki, Massoud; Eskandari, Ahmad

doi:10.1016/j.matdes.2012.01.040

Cited by 129 publications

(65 citation statements)

References 9 publications

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“…The vibrating pin impacts the surface of the weld, and imparts plastic deformation in the treated region [11]. Plastic deformation from UIT has been shown to modify (smooth) the weld toe profile and produce a layer of compressive residual stress at the treated surface [12,13]. UIT also causes changes in microstructure that affect local and bulk mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of ultrasonic impact treatment on weld microstructure, hardness, and residual stress

Liu

Chen

Hill

et al. 2017

Materials Science and Technology

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Layered ultrasonic impact treatment (LUIT) was used on V-groove welds in 55 mm Q345 steel plate. Two welds were prepared, one by conventional gas metal arc welding (GMAW) and the other by GMAW and LUIT, where impact treatment was performed at nine stages during filling of the 28-pass weld. Microstructure, hardness, and residual stress in the welds were compared. While residual stress is very similar, there are significant differences in microstructure and hardness. The LUIT weld has mainly equiaxed grains and uniform hardness, while the conventional weld has columnar grains and a hardness gradient. It appears that beads in the LUIT weld did not exhibit columnar grain growth, and instead equiaxed grains grew from the fusion boundary into the weld. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Effects of ultrasonic impact treatment on weld microstructure, hardness, and residual stress

Liu

Chen

Hill

et al. 2017

Materials Science and Technology

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“…In this work, ultrasonic impact treatment (UIT) for manufacturing of AISI 304 stainless steel components is taken as an example to explore correlating the process loads to surface integrity parameters for solving the inverse surface integrity problem due to its simplicity and controllability in the external mechanical load. Moreover, it is also of practical importance since this type of method utilizing mechanical impact for surface modification of component has been employed as a mature technology in industry [14][15][16]. In the present case, changes in microhardness and residual stresses of the UIT-treated stainless steel, i.e., changes of surface integrity parameters, as a result of the mechanical external load under UIT impact and the resultant material loading including strain and stress field generated in the component, have been evaluated experimentally and numerically to establish a quantitative correlation between process parameters and changes of surface integrity, aiming for the high-performance manufacturing of a desired surface integrity in a knowledge-based way.…”

Section: Introductionmentioning

confidence: 99%

Inverse surface integrity problem in ultrasonic impact-treated AISI 304 stainless steel components

Wang

Zhu

Lei

et al. 2016

Int J Adv Manuf Technol

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The inverse problem for surface integrity is still not solved in practice during high-performance component manufacturing, i.e., it is not possible selecting an appropriate process as well as process parameters in advance according to the given surface integrity required for the high performance. The desired surface integrity is usually created by trial and error based on an iterative approach due to lack of quantitative correlations between the loads of a process and the surface integrity variations during manufacturing. The inverse surface integrity problem is studied for manufacturing AISI 304 stainless steel components by employing an ultrasonic impact treatment (UIT) to achieve an enhanced fatigue performance. The correlations are explored between the process loads of mechanical impact, corresponding material loading within the treated component and surface integrity change in the surface layer due to surface modification. Based on experimental and numerical studies, such correlations of UIT process are identified primarily as the quantitative correlation between external mechanical load and material loading of strain and stress, and that between material loading and changes in surface integrity parameters such as residual stress and microhardness due to surface modification. It is demonstrated that a knowledge-based solution of the inverse surface integrity problem is possibly achieved by establishing the correlations to derive process parameters from a given surface integrity for manufacturing of high-performance components.

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“…Compactness, mobility and low cost of equipment for high-frequency mechanical peening (HFMP) allows strengthening parts of machines and metal structures in any spatial position in the field, in particular under the water [11]. Works [12][13][14][15] give the results of experimental studies of the effectiveness of application of HFMP technology, known in foreign publications as «ultrasonic shock treatment», to improve corrosion resistance and characteristics of corrosion fatigue resistance of welded joints. In these studies assessment of corrosion resistance, corrosion rate and corrosion fatigue of welded joints was performed in NaCl solutions.…”

mentioning

confidence: 99%

“…Works [12][13][14][15] give the results of experimental studies of the effectiveness of application of HFMP technology, known in foreign publications as «ultrasonic shock treatment», to improve corrosion resistance and characteristics of corrosion fatigue resistance of welded joints. In these studies assessment of corrosion resistance, corrosion rate and corrosion fatigue of welded joints was performed in NaCl solutions.…”

mentioning

confidence: 99%

Influence of corrosion damage on cyclic fatigue life of tee welded joints treated by high-frequency mechanical peening

Knysh¹,

Solovej²,

Nyrkova³

et al. 2016

The Paton Welding J.

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We studied the effectiveness of application of high-frequency mechanical peening to improve fatigue resistance characteristics of tee welded joints in metal structures which are operated in a sea climate. Corrosion damage characteristic for such structures after long-term service was produced by soaking the welded joints in KST-1 salt spray chamber for 1200 h. Metallographic studies were conducted of weld zone and HAZ of welded joints in the initial (unstrengthened) state and in the state of strengthening by the HFMP technology after the impact of corrosive environment. It was established that strengthening by this technology does not improve the joint resistance to the impact of neutral salt spray. Fatigue testing of welded joints were performed in the initial and strengthened state after the impact of neutral salt spay. It was found that strengthening tee welded joints by HFMP before the corrosive impact allows increasing their fatigue strength at 2•10 6 cycles by 48 % and increasing cyclic fatigue life by 2-5 times. Compactness, mobility and low cost of equipment for high-frequency mechanical peening (HFMP) allows strengthening parts of machines and metal structures in any spatial position in the field, in particular under the water [11]. Works [12][13][14][15] give the results of experimental studies of the effectiveness of application of HFMP technology, known in foreign publications as «ultrasonic shock treatment», to improve corrosion resistance and characteristics of corrosion fatigue resistance of welded joints. In these studies assessment of corrosion resistance, corrosion rate and corrosion fatigue of welded joints was performed in NaCl solutions.Analysis of polarization fatigue curves showed that strengthening by HFMP technology increases the corrosion potential and lowers the corrosion rate of peening zone (line of weld metal transition to HAZ). Here, cyclic fatigue life of butt welded joints of pipes rises 2 times, and that of tee joints -up to 6 times. It should be noted that the above data of accelerated corrosion testing do not give an idea about lowering of service properties of HFMP-treated welded joints as the strengthened metal layer is destroyed.Influence of partial corrosion loss of HFMP-strengthened metal layer on residual stress fields and cyclic fatigue life of welded joints is considered in [16,17]. In [16] it is shown that corrosion damage of welded joints of low-alloyed shipbuilding steel equivalent to 7.5 years of operation leads to reduction of the thickness of surface layer of metal with induced residual compressive stresses approximately from 1.5 to 1.0 mm, and lowering of their maximum level. The authors came to the conclusion about the rationality of welded joint treatment by HFMP, as compressive residual stresses are induced in the peening zone instead of tensile residual stresses, and they are preserved even at partial loss of the strengthened layer. In [17] metallographic studies showed that soaking of welded joints of weather-resistant steel in moisture chamber G4 at elevat...

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Strength enhancement of the welded structures by ultrasonic peening

Cited by 129 publications

References 9 publications

Effects of ultrasonic impact treatment on weld microstructure, hardness, and residual stress

Effects of ultrasonic impact treatment on weld microstructure, hardness, and residual stress

Inverse surface integrity problem in ultrasonic impact-treated AISI 304 stainless steel components

Influence of corrosion damage on cyclic fatigue life of tee welded joints treated by high-frequency mechanical peening

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