Effect of laser shock peening on the microstructure and corrosion resistance in the surface of weld nugget zone and heat-affected zone of FSW joints of 7050 Al alloy

Liu, Peng; Sun, Sihao; Hu, Jiaying

doi:10.1016/j.optlastec.2018.10.054

Cited by 47 publications

(11 citation statements)

References 32 publications

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“…It was worthy to be noted that the corrosion resistance of the joint surface can be improved by various techniques such as ultrasonic shot peeing treatment; LPT and SPT. 160,161 For instance, Liu et al 160 investigated the influence of LPT on the corrosion resistance of SZ and HAZ of FSWed joints of AA7975-T741 and observed that LPT enhances the corrosion rate of SZ and HAZ. Rui-dong et al 161 investigated the effect of SPT using acid salt spray on FSWed joints of AA7075.…”

Section: Effect Of Corrosion Inhibitors Corrosion Inhibitors Decreases the Corrosion Susceptibility Of Jointmentioning

confidence: 99%

Precipitation-dependent corrosion analysis of heat treatable aluminum alloys via friction stir welding, a review

Majeed

Mehta

Siddiquee

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Although the various advantages of novel Friction stir welding (FSW) process; the weld surfaces are subjected to various serious problems such as lower corrosion resistance, high susceptibility to stress corrosion cracking and poor joint fatigue strength due to complex material flow and severe plastic deformation during the welding process. Corrosion behaviour of friction stir welded (FSWed) precipitate strengthening Al alloys have significant impact on metallurgical and electrochemical properties of structures. In FSW of precipitate strengthening Al alloys the localized heat input and severe plastic deformation creating appreciable changes in microstructure and modifies the microchemistry and metallurgical characteristics of precipitates. The heterogeneous distribution of precipitates and precipitate free zones (PFZs) along the grain boundaries leads to variation in electrochemical behaviour across the weld zones and hence increasing the susceptibility of weld surface to various corrosion attacks such as intergranular corrosion, pitting corrosion, exfoliation corrosion, stress corrosion cracking and galvanic corrosion. However, the corrosion resistance of FSWed joints can be improved either by reducing the size or redissolve the coarsened precipitates within the joint or modifying the microchemistry by controlling the size, location and distribution of precipitates which largely determine the corrosion rate of the weld surfaces. Consequently, it is imperative to address the influence of material modifications during FSW on corrosion behaviour of weld surface. This review paper addresses the precipitate dependent corrosion behaviour of FSWed joints of heat treatable/precipitate strengthening Al alloys and the various effective methods either to reduce or eliminate the effect of corrosion attack in FSWed joints of heat treatable Al alloys.

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Section: Effect Of Corrosion Inhibitors Corrosion Inhibitors Decreases the Corrosion Susceptibility Of Jointmentioning

confidence: 99%

Precipitation-dependent corrosion analysis of heat treatable aluminum alloys via friction stir welding, a review

Majeed

Mehta

Siddiquee

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…In marine environments, aluminum alloy structures are prone to pitting corrosion, intergranular corrosion, and exfoliation corrosion behaviors due to the adsorption and osmosis of corrosion factors (for example, Cl − ) [8][9][10][11]. More specifically, the corrosion of welded joints [10][11][12][13] seriously affects the safe and reliable use of aluminum alloy structures. Therefore, in order to prevent the corrosion failure of welded aluminum structures in marine environments, great efforts have been directed toward the investigation of welded-joint corrosion.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Fatigue Fracture Characteristics of FSW 7075 Aluminum Alloy Joints

Shao

Bai

et al. 2020

Materials

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The corrosion fatigue properties and fracture characteristics of friction stir welding joints of 7075 aluminum alloys were studied via corrosion fatigue tests, electrochemical measurements, and corrosion fatigue morphology and microstructure observations. The results show that the corrosion fatigue crack of the friction stir welding (FSW) joint of 7075 aluminum alloys originated in the junction zone between the thermomechanically affected zone and the weld nugget zone. The corrosion fatigue life of the joint decreased with increasing stress amplitude, with an S–N curve equation of lgN = 5.845 − 0.014S. Multiple crack sources were observed in the corrosion fatigue fracture. The main crack source originated from the corrosion pits at the interface between the thermomechanically affected zone and the weld nugget zone due to the influence of the coarse microstructure and the large potential difference between both zones. Corrosion morphologies of a rock candy block and an ant nest appeared in the crack propagation zone and the grain boundary of the weld nugget zone. In addition, fatigue speckles and intergranular fractures were observed, as well as brittle fracture characterized by cleavage steps and secondary cracks in the final fracture zone.

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“…Among these light alloys, aluminium alloy is the most common one. Almost all the aluminium alloys can be joined using FSW 1–4 . FSW brings finer grain and uniformly distributed precipitates or reinforcements in stir zone (SZ) 5–9 .…”

Section: Introductionmentioning

confidence: 99%

“…Almost all the aluminium alloys can be joined using FSW. [1][2][3][4] FSW brings finer grain and uniformly distributed precipitates or reinforcements in stir zone (SZ). [5][6][7][8][9] It generally shows a better mechanical property compared with that of base metal (BM).…”

Section: Introductionmentioning

confidence: 99%

Effect of rolling process on fatigue performance of stir zone of AA6061‐T6 doube‐side friction stir welding joint

Pan

Chen

et al. 2020

Fatigue Fract Eng Mat Struct

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Stir zone (SZ) of AA6061‐T6 double‐side friction stir welding (DS‐FSW) joint with a thickness of 6 mm had a poor fatigue performance compared with that of base metal (BM). The rolling process was employed to improve the fatigue performance of SZ. The results showed that rolling process increased the dislocation density in SZ and remarkably enhanced its fatigue performance. The crack initiation played a key role in the fatigue performance of SZ. It relied on the debonding of lamellar structure in SZ. The debonding of lamellar structure depended on the cracking of fine grain layer in lamellar structure.

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Effect of laser shock peening on the microstructure and corrosion resistance in the surface of weld nugget zone and heat-affected zone of FSW joints of 7050 Al alloy

Cited by 47 publications

References 32 publications

Precipitation-dependent corrosion analysis of heat treatable aluminum alloys via friction stir welding, a review

Precipitation-dependent corrosion analysis of heat treatable aluminum alloys via friction stir welding, a review

Corrosion Fatigue Fracture Characteristics of FSW 7075 Aluminum Alloy Joints

Effect of rolling process on fatigue performance of stir zone of AA6061‐T6 doube‐side friction stir welding joint

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