The effect of controlled shot peening on the fatigue behaviour of 2024-T3 aluminium friction stir welds

Ali, Aidy; An, Xianghai; Rodopoulos, C. A.; Brown, M. W.; O'Hara, Peter; Levers, Andrew; Gardiner, S.

doi:10.1016/j.ijfatigue.2006.10.032

Cited by 74 publications

(44 citation statements)

References 19 publications

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“…Figure 8 shows that the crack initiation points in both conditions were originating from a single point at the sample's surface within the weld nugget zone. This result is in agreement with that reported in [13] which indicated that the weld nugget is the zone which is likely to introduce local stress concentrations as well as higher possibility of crack formation within the nugget area and hence the probability for premature crack coalescence due to the particles and intermetallics de-cohesion. …”

Section: Hardnesssupporting

confidence: 93%

Fatigue life of friction stir welded-aluminum alloy-7010 joints

Rayes¹,

El‐Danaf²,

Soliman³

2015

Materials Characterisation VII

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FSW is a solid state welding process which is widely used with high strength Aluminum Alloys (AA) such as AA-7xxx series. This alloy series is typically used in various structural applications such as truck wheels and bodies, heavy duty structures and aerospace. Durability of these structures is perhaps the most significant attribute they can possess manifesting the importance of fatigue life assessment. In this work, FSW was applied on AA-7010 using tool rotational speed of 850 rpm at a welding speed of 56 mm/min. The tool axial load was maintained constant within the whole welding runs. The resulting weldments were divided into two groups namely; as-welded and shot-peened conditions. Tensile and axial fatigue testing with stress-ratio (R=0.1) were used to evaluate and compare tensile properties and S-N curves of the welded and welded + peened conditions. The weldments were also characterized using optical microscopy, fractography, mechanical and fatigue testing as well as microhardness profiles across the weldment.

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Section: Hardnesssupporting

confidence: 93%

Fatigue life of friction stir welded-aluminum alloy-7010 joints

Rayes¹,

El‐Danaf²,

Soliman³

2015

Materials Characterisation VII

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“…In order to improve the mechanical properties of this alloy, numerous treatment processes have been invented and investigated in the past several decades. In general terms, the treatment processes could be classified into two categories: body treatments such as heat treatments (HTs), particle reinforced metal matrix composites (PRMMCs) [4][5][6], and surface treatments such as surface melting (SM) [7], shot peening (SP) [8,9], and laser peening (LP) [10][11][12][13]. For example, Hong et al [6], from Shanghai Jiaotong University, investigated the effect of cryogenic pre-treatment on aging behavior of in-situ TiB 2 /Al-Cu-Mg composites and found that the ultimate tensile strength and the elongation of the samples aged with a cryogenic pre-treatment were lower than the samples without cryogenic pre-treatment, while the hardness and the yield strength were higher.…”

Section: Introductionmentioning

confidence: 99%

Tensile Properties and Microstructures of a 2024-T351 Aluminum Alloy Subjected to Cryogenic Treatment

Zhou

Huang

et al. 2016

Metals

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Abstract:The aim of this study was to investigate the effects of the cryogenic treatment (CT) using liquid nitrogen on tensile properties and microstructures of the 2024-T351 aluminum alloy. Tensile tests were carried out, and tensile fractures were observed using a scanning electron microscope (SEM). The microstructure evolution of 2024-T351 subjected to CT was also studied using both an optic microscope (OM) and a SEM. The components of the second phase were tested with an energy dispersive spectrometer (EDS). The results showed that both the ultimate strength and the yield strength of the 2024-T351 aluminum alloy could be improved through CT without the sacrifice of elongation. In addition, tensile fractures showed that the plasticity of 2024-T351 aluminum might also be improved, as the dimples in the fracture of the CTed specimens were markedly more uniform compared with the untreated specimen. The phenomenon of grains refinement (GR) was found through microstructure observation. It was also found that the second phases were distributed more uniformly after CT. A conceivable mechanism concerning the shrinking effect and crystal grain movement was raised to explain the experimental phenomena. The effects of CT on residual stress in the 2024-T351 aluminum alloy are discussed herein. Measurements showed that tensile residual stress in 2024-T351 was removed, and slight compressive residual stress was generated after CT. This may also contribute to the improvement of the tensile properties of the alloy.

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“…This value is almost equal to the 0.2% proof stress of 2024-T351 aluminum alloy 26 and the values obtained using other peening methods such as nanosecond laser peening, shot peening, or ultrasonic peening. [27][28][29][30][31][32] The compressive stress decreases to zero around 90 lm, which is around one tenth of the peened depth obtained by nanosecond laser peening.…”

Section: Resultsmentioning

confidence: 99%

Femtosecond laser peening of 2024 aluminum alloy without a sacrificial overlay under atmospheric conditions

Sano¹,

Eimura²,

Kashiwabara³

et al. 2016

Journal of Laser Applications

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The authors have successfully performed femtosecond laser peening on a 2024 aluminum alloy without any sacrificial overlays. Laser pulses were directly irradiated to the surface of specimens in the air without water film as a plasma confinement medium during the peening treatment. The fatigue life was improved as much as 38 times in comparison with base material at a stress amplitude of 195 MPa. The fatigue strength of the peened specimen after 2 × 106 cycles was 58 MPa larger than that of the base material. The femtosecond laser peening process has a great potential to be applied in various fields where conventional peening methods cannot be used, as this process can be performed under ambient conditions without the use of a plasma confinement medium such as water or transparent materials.

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The effect of controlled shot peening on the fatigue behaviour of 2024-T3 aluminium friction stir welds

Cited by 74 publications

References 19 publications

Fatigue life of friction stir welded-aluminum alloy-7010 joints

Fatigue life of friction stir welded-aluminum alloy-7010 joints

Tensile Properties and Microstructures of a 2024-T351 Aluminum Alloy Subjected to Cryogenic Treatment

Femtosecond laser peening of 2024 aluminum alloy without a sacrificial overlay under atmospheric conditions

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