Influence of ultrasonic peening on microstructure and surface performance of laser-arc hybrid welded 5A06 aluminum alloy joint

Yang, Biao; Tan, Caiwang; Zhao, Yijiang; Wu, Laijun; Chen, Bo; Song, Xiaoguo; Zhao, Hongyun; Feng, Jicai

doi:10.1016/j.jmrt.2020.06.057

Cited by 30 publications

(9 citation statements)

References 32 publications

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“…Meanwhile, the grain size can be further decreased under multiple impacts. As shown in Yang's results, 27 equiaxed grains with a size of 100 m were observed (a) before UP process, while fine grains were observed in surface regions of UP-treated samples and some grains were slightly distorted and elongated. The size of fined grains was less than 50 m. When the peening needle velocity decreased from 2.0 to 1.0 m/min, the finedgrain region enlarged in depth and more remarkable distortion of grains was observed.…”

Section: Surface Hardnessmentioning

confidence: 74%

Study on surface properties and fatigue performance of aluminum alloy plate with prestressed ultrasonic peening

Zhang

Gong

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Prestressed ultrasonic peening (UP) is beneficial to enlarge bending deformation and improve surface properties of the plate compared to free UP process. The effects of processing parameters on variation of surface topography, surface roughness and hardness, residual stress distribution are analyzed. Then the microstructure and fatigue life with prestressed UP is studied. The results show that smaller surface roughness, larger surface hardness, larger and deeper compressive residual stress are generated in prestressed UP compared to free UP. Small prebending curvature radius and offset distance both contribute to enhancement of surface properties. Large firing pin velocity is beneficial for large surface hardness as well as larger and deeper compressive residual stress; nevertheless, it will increase the surface roughness. The UP process mainly improves the high cycle fatigue life of the material, while there is no difference of the low cycle fatigue life between the peened and un-peened samples. The high cycle fatigue life significantly increases at small stress after peening process and it can be further enhanced after prestressed UP. Deformation band with peened indentations are generated on the surface. With the experiments of distributions for hardness, yield stress and residual stress, the strengthening mechanism in peening process is discussed.

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Section: Surface Hardnessmentioning

confidence: 74%

Study on surface properties and fatigue performance of aluminum alloy plate with prestressed ultrasonic peening

Zhang

Gong

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…5A06 Al-alloy with good corrosion resistance, machinability, and weldability, is one of the mostly widely used materials for automotive, aerospace, and other industries [ 22 , 23 ]. In this paper, plates with a size of 750 mm × 400 mm × 5 mm were selected as the base material (BM), which was provided by Weihai Jindi Non-ferrous Metals Co., Ltd. (Weihai, China) [ 23 ], the chemical compositions are shown in Table 1 . The wire used in this paper was ER5183 and the diameter was 1.2 mm, which has a similar chemical composition in comparison with the BM [ 22 ]; the chemical compositions are shown in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

Stability of Weld Pool and Elimination of Weld Defects in Aluminum Alloy Plasma Arc Keyhole Welding at Continuously Varying Positions

Wei

Zhang

et al. 2021

Materials

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Mathematical statistics were used to study the stability of weld pool and the elimination of weld defects in aluminum alloy plasma arc keyhole welding at continuously varying positions. In the mathematical model, the mass transfer position and spatial welding position were taken as the input, and the shape of the welded joints (symmetry/deviation) was taken as the output. The results showed that the fitted curves of the front, back, and average deviations of the weld seam were all similar to the actual curves. According to the optimum results obtained in the experiment and the mathematical models, the mass transfer position only needs to be adjusted once (near to 30°) during the continuously varying positions, from vertical-up to horizontal welding. A breakthrough from fixed environmental variables to dynamic environmental variables in the process control of the keyhole weld pool was realized, which enabled the Al-alloy keyhole weld pool to resist the disturbance caused by gravity during variable position welding. The deviation of the welded joints of the whole plate was smaller than 0.5 mm, and the mechanical properties of the weld reached at least 85% compared to those of the base material, thus meeting the requirements of Al-alloy welding.

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“…Residual stresses are significant in the high energy density process (such as laser or electron beam welding) due to the severe temperature gradients and the high heating/cooling rate [9,10]. Residual stress leads to brittle fracture and reduced fatigue life and can be reduced both by heat treatments [9,10,[12][13][14][15][16] and mechanical treatment [17][18][19][20][21][22][23][24][25]. The role of the energy density on hardness evolution was investigated by Vicker indentation (0.3/15 s) in the cross section of the joints along a line perpendicular to join interface.…”

Section: Mechanical Properties: Microhardness and Tensile Test Of The As Welded Samplesmentioning

confidence: 99%

“…The efficiency of the UPT treatment obviously depend on the geometry of the impactor, on the percussion intensity and on the duration of the treatment. These parameters need to be accurately regulated to avoid that the treatment is too mild and thus ineffective, but at the same time not too much severe, to not irremediably damage the material [22]. Most papers study the effects of UPT on fatigue behaviors showing that under correct conditions UPT produces high improvement in fatigue life [23][24][25] or wear and corrosion resistance [21,22].…”

Section: Introductionmentioning

confidence: 99%

“…These parameters need to be accurately regulated to avoid that the treatment is too mild and thus ineffective, but at the same time not too much severe, to not irremediably damage the material [22]. Most papers study the effects of UPT on fatigue behaviors showing that under correct conditions UPT produces high improvement in fatigue life [23][24][25] or wear and corrosion resistance [21,22]. However, few investigations aimed to evaluate the effects of UPT on tensile properties of laser welded dissimilar joints.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Process Parameters, Post-Weld Heat Treatment and Peening Effects on Microstructure and Mechanical Performance of Ti–Al Dissimilar Laser Weldings

Leo

D’Ostuni

Nobile

et al. 2021

Metals

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Dissimilar Ti–Al laser weldings are very interesting due to their difficulties in being processed because of the different physical properties of the alloys and the crack formations during cooling and solidification. In this study, the effect of laser offset and defocusing on microstructure, geometry and mechanical properties response of 2 mm thick dissimilar AA6061/Ti-6Al-4V laser welds was analyzed. Moreover, in order to reduce residual stresses, the joints were both heat-treated and mechanically treated by ultrasonic peening. The welds microstructure was found to be martensitic in the Ti-6Al-4V fusion zone, columnar dendritic in the AA6061 fusion zone and partially martensitic in the Ti-6Al-4V heat-affected zone. Intermetallic compounds based on the Al–Ti system were detected at the AA6061/Ti-6Al-4V interface and in the aluminum fusion zone. Both negative defocusing and higher laser offset improved the tensile performance of the welds, mainly by reducing the amount of brittle intermetallic compounds. The stress relaxation heat treatment, leading to the aging of the martensite and the increasing of the size of the intermetallic compound, reduced the tensile strength and ductility of the joints. On the contrary, for dissimilar Al–Ti welds, mechanical treatment was effective in increasing joints ductility and, moreover, corrosion resistance.

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Influence of ultrasonic peening on microstructure and surface performance of laser-arc hybrid welded 5A06 aluminum alloy joint

Cited by 30 publications

References 32 publications

Study on surface properties and fatigue performance of aluminum alloy plate with prestressed ultrasonic peening

Study on surface properties and fatigue performance of aluminum alloy plate with prestressed ultrasonic peening

Stability of Weld Pool and Elimination of Weld Defects in Aluminum Alloy Plasma Arc Keyhole Welding at Continuously Varying Positions

Analysis of the Process Parameters, Post-Weld Heat Treatment and Peening Effects on Microstructure and Mechanical Performance of Ti–Al Dissimilar Laser Weldings

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