New insight into high frequency impacting and rolling of 2A12 aluminum welded joint involving nanocrystallization

Zhang, Huijing; Zhao, Xiaohui; Xu, Desheng; Liu, Yu; Qiu, Xiaoming

doi:10.1016/j.apsusc.2019.05.234

Cited by 18 publications

(5 citation statements)

References 51 publications

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“…Cr can infinitely dissolve in Fe solution so that some Cr 2+ ions replace Fe 2+ ions, and this leads to the formation of Cr x Fe 1-x OOH [31]. The rust layers become ion selective due to Cr x Fe 1-x OOH and prevent sulfate ions from permeating effectively [32,33,34]. Furthermore, the enrichment of Cr in defects and grain boundaries has a positive effect on the formation of more compact rust layers.…”

Section: Resultsmentioning

confidence: 99%

Corrosion Behavior of SMA490BW Steel and Welded Joints for High-Speed Trains in Atmospheric Environments

Zhang

et al. 2019

Materials

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Currently, high-speed trains work under various atmospheric environments, and the bogie as a key component suffers serious corrosion. To investigate the corrosion behavior of bogies in industrial atmospheric environments, the periodic immersion wet/dry cyclic corrosion test for SMA490BW steel and automatic metal active gas (MAG) welded joints used for bogies was conducted in the present work. Corrosion weight loss rate, structure, and composition of rust layers as well as electrochemistry parameters were investigated. The results showed that the corrosion weight loss rate decreased with increasing corrosion time; furthermore, the corrosion weight loss rate of the welded joints was lower than that of SMA490BW steel. The XRD results showed that the rust layers formed on SMA490BW steel and its welded joints were mainly composed of α-FeOOH, γ-FeOOH, Fe2O3, and Fe3O4. The observation of surface morphology indicated that the rust layers of the welded joints were much denser and had a much finer microstructure compared with those of SMA490BW steel. After corrosion for 150 h, the corrosion potential of the welded joints with rust layers was higher than that of SMA490BW steel. In short, the welded joints exhibited better corrosion resistance than SMA490BW steel because of the higher content of alloy elements, as shown in this work.

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Section: Resultsmentioning

confidence: 99%

Corrosion Behavior of SMA490BW Steel and Welded Joints for High-Speed Trains in Atmospheric Environments

Zhang

et al. 2019

Materials

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“…Figure 5 shows the distribution and shape of the eutectic phase with the different weld seams when the wire feeding speed of 6 m/min was employed. The eutectic phase of the Al-Cu alloy mainly consists of α-Al + θ-Al 2 Cu, which is the white particle [23]. The eutectic phase of the GMAW weld bead is shown in Fig.…”

Section: Observation Of the Microstructure By Semmentioning

confidence: 99%

Microstructure Evolutions and Properties of Al–Cu Alloy Joint in the Pulsed Power Ultrasonic-Assisted GMAW

Chen

Fan

Liu

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The pulsed power ultrasonic-assisted gas metal arc welding (PU-GMAW) is a new development hybrid welding method. The influences of the pulsed power ultrasonic on the microstructure evolution of the welded joint of Al-Cu alloy were investigated by using scanning electron microscopy, transmission electron microscope and electron back scattering diffraction. The results showed that the efficient heat input in the PU-GMAW was increased by above 100% compared with the traditional GMAW. The grain and eutectic of the PU-GMAW weld seam were refined compared with that of the GMAW. Cavitation and acoustic streaming induced the dendrite fragmentation (α-Al) and heterogeneous nucleation, which were the main reasons for the grain refinement. The microhardness of the PU-GMAW welded joint was improved compared with that of the GMAW owing to the change of the eutectic and grain.

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“…9 In addition, other ultrasonic-strengthening methods have currently been identified: ultrasonic shot peening, ultrasonic impact, and ultrasonic rolling, which can all introduce large residual stress to a certain 1 School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang, China extent and improve the surface quality and fatigue life of a sample. [10][11][12] Studies have notably reported that the improper selection of surface mechanical-strengthening-process parameters can lead to surface defects (such as overlapping, microcracks, and impact pits), deteriorating the integrity of the treated surface and significantly reducing the service life of the parts. [13][14][15] Therefore, selecting optimized strengthening-process parameters is critical.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the residual stress and surface morphology of TI6AL4V using elastoplastic contact ultrasonic rolling

Jiahui

Jiayuan

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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As ultrasonic rolling mainly affects the residual stress and surface morphology of Ti6Al4V, it is of great significance to study different process parameters, such as amplitude, static pressure, time, and step length, thereby improving the performance of Ti6Al4V. However, unstable bouncing caused by the elastic relationship between the indenter and the sample is inevitable. Based on finite-element analysis and Hertz contact theory, the concept of critical damping was proposed to quickly stabilize the system. Therefore, a three-dimensional finite-element model was established using the ABAQUS software, after which the ultrasonic-rolling process was simulated by applying static pressure on the sample surface using a spring. Then, the distribution of residual stress under different amplitudes, static pressures, times, and step lengths was analyzed. Based on simulation and experimental results showed that the maximum residual stress of −689.802 MPa was obtained when the amplitude, static pressure, and time were 10 µm, 600 N, and 0.064 s, respectively. When the step length was 1/2 of the indentation width, the surface stress concentration was obvious, convex defects were large, and surface roughness Ra increased to 1.076 µm. Investigations also revealed that when the step length was 1/8, Ra decreased by 39.68% compared with that when the step length was 1/2, the thickness of the plastic-deformation layer reached 56.07 µm. When the step length was 1/10, the maximum compressive residual stress reached −888.007 MPa and Ra increased. On the basis of the abovementioned optimization parameters, the influence of step length on the properties of Ti6Al4V alloy was further explored, and direction for the strengthening process of Ti6Al4V alloy by studying the pattern of surface strengthening was presented.

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New insight into high frequency impacting and rolling of 2A12 aluminum welded joint involving nanocrystallization

Cited by 18 publications

References 51 publications

Corrosion Behavior of SMA490BW Steel and Welded Joints for High-Speed Trains in Atmospheric Environments

Corrosion Behavior of SMA490BW Steel and Welded Joints for High-Speed Trains in Atmospheric Environments

Microstructure Evolutions and Properties of Al–Cu Alloy Joint in the Pulsed Power Ultrasonic-Assisted GMAW

Analysis of the residual stress and surface morphology of TI6AL4V using elastoplastic contact ultrasonic rolling

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