Effect of laser shock peening on mechanical and microstructural aspects of 6061-T6 aluminum alloy

Dhakal, B.; Swaroop, S.

doi:10.1016/j.jmatprotec.2020.116640

Cited by 91 publications

(26 citation statements)

References 41 publications

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“…This effect was more pronounced in Al6061‐T6 alloy than in Ti6Al4V alloy (see Figure 6) owing to its low yield strength and ductile nature. Compared with the surface roughness achieved in our case, Dhakal and Swaroop 27 achieved a surface roughness of only about 2 μm on Al6061‐T6 surface using almost similar peak power density (4 GW/cm 2 ). However, they used small spot size (0.8 mm) and very high overlap (70%), which accounts for the absence of macrotexturing effect.…”

Section: Resultssupporting

confidence: 47%

“…Strain rates during LSP can go as high as 10 6 s −1 36 . At such high strain rates, the dynamic recrystallization process forms new subgrains owing to the rapid multiplication of dislocation tangles and twin formation produced by severe plastic deformation 27,35 . No particular change in the size and distribution of precipitates was observed.…”

Section: Resultsmentioning

confidence: 99%

“…Similar results have been reported in literature as well. Dhakal and Sworoop 27 reported good peening effect for Al6061‐T6 using peak power density of 4 to 6 GW/cm 2 . For Ti6Al4V alloy, peak power densities in the range of 5–10 GW/cm 2 have been utilized 28,29 .…”

Section: Experimental Methodologymentioning

confidence: 99%

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Fatigue performance of laser shock peened Ti6Al4V and Al6061‐T6 alloys

Maharjan¹,

Chan²,

Ramesh³

et al. 2020

Fatigue Fract Eng Mat Struct

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Propagation of fatigue crack in laser shock peened metallic component is retarded by introduction of deep compressive residual stresses during the process. Apart from large compressive residual stress build‐up near the surface, surface topography is also significantly altered during laser shock peening. However, a systematic evaluation of the individual effects of residual stresses and surface topography as well as their interaction effects on fatigue crack initiation and growth is still lacking. This study investigates the effect of laser shock peening on near‐surface properties of Ti6Al4V and Al6061‐T6 alloys and how these changes dictate their overall fatigue performance. Microstructure, surface topography, hardness and residual stress state of the alloys are investigated before and after peening, and four‐point bending fatigue tests are performed to obtain Wöhler curves (S‐N curves) for each case. The results show that both surface residual stresses and surface topography influence the fatigue life of a component. Compressive residual stresses were induced to a depth beyond 1 mm for both alloys. Fatigue life of Ti6Al4V alloy increased by at least 1.28 times after laser shock peening due to the introduction of deep compressive residual stresses with minimal change in surface topography. By contrast, the improvement is nominal for Al6061‐T6 alloy due to the surface roughening effect introduced by laser peening, which results in early crack initiation and negates the beneficial effect of compressive residual stresses.

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Section: Resultssupporting

confidence: 47%

Section: Resultsmentioning

confidence: 99%

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Fatigue performance of laser shock peened Ti6Al4V and Al6061‐T6 alloys

Maharjan¹,

Chan²,

Ramesh³

et al. 2020

Fatigue Fract Eng Mat Struct

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“…For high temperature applications, LSP has additional advantages over other surface treatments due to its ability to impart deep compressive residual stresses [143], lower cold work on the surface [144] and the ability for grain refinements [145,146]. Inherently, the LSP process introduces high strain rates up to 10 6 s -1 which generate beneficial dislocations near the surface layer [147][148][149]. Table 5 compares the effects of shot peening and LSP on strain rate, cold work, depth of influence and the typical roughness of wrought X20 steel.…”

Section: Suitability Of Surface Enhancement Processmentioning

confidence: 99%

A Critical Review of the Material Characteristics of Additive Manufactured IN718 for High Temperature Application

Yong¹,

Gibbons²,

West³

2020

Preprint

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This paper reviews state of the art Additive Manufactured (AM) IN718 alloy intended for high temperature applications. AM processes have been around for decades and have gained traction in the past five years due to the huge economic benefit it brings to manufacturers. It is crucial for the scientific community to look into AM IN718 applicability in order to see a step-change in the production. Microstructural studies reveal that the grain structure plays a significant role in determining the fatigue lifespan of the material. Controlling IN718 respective phases such as the &upsih;’', δ and Laves phase is seen to be crucial. Literature reviews have shown that the mechanical properties of AM IN718 were very close to its wrought counterpart when treated appropriately. Higher homogenization temperature and longer ageing were recommended to dissolve the damaging phases. Various surface enhancement techniques were examined to find out their compatibility to AM IN718 alloy that is intended for high temperature application. Laser shock peening (LSP) technology stands out due to the ability to impart low cold work which helps in containing the beneficial compressive residual stress it brings in high temperature fatigue environment.

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“…Aluminum is a material that is often used in various applications such as automotive, aircraft, construction, and piping systems [1][2][3]. Good corrosion resistance, weldability, thermal conductivity, and strength-to-weight ratio are the advantages of aluminum and its alloys [4][5][6][7]. Aluminum alloys can be classified according to the type of main alloying element (series 1xxx to 8xxx), aluminum alloys that cannot be heat-treated or those that can be heat-treated (see in Figure 1) [8].…”

Section: Introductionmentioning

confidence: 99%

Weld Geometry, Mechanical Properties, Microstructure and Chemical Composition of AA6063 in Tungsten Inert Gas Welding with Intermittent Controlled Wire Feeding Method

Baskoro

Amat

Simatupang

et al. 2021

Metals

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In this study, AA 6063 aluminum was joined using Tungsten Inert Gas (TIG) welding with a butt joint. The ER-5356 filler metal feeding method is used intermittently to find its effect on weld geometry, mechanical properties, microstructure, and chemical composition. The dimensions of the specimens used in this study were 120 mm × 50 mm, with a thickness of 3 mm. The ratio used is the configuration of the feed time and delay time. The length ratio of wire filler is varied from a ratio of 4 to 6. The top bead width and back bead width decreased by 17.66% and 40.33%, respectively. At a ratio of 6, it has the largest cross-sectional area of 295.37 ± 27.60 mm2. The results show that the general tensile strength was proportional to the ratio, but the difference was not significant, only around ±8 MPa. The microstructure formed in each weld has different characteristics; conversely, grains with a relatively coarse structure have decreased hardness values. The chemical composition test shows that the length ratio of filler metal feed directly correlates with magnesium’s average weight content, where the weight content of magnesium value tends to be homogeneous in all areas of weld metal (WM).

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Effect of laser shock peening on mechanical and microstructural aspects of 6061-T6 aluminum alloy

Cited by 91 publications

References 41 publications

Fatigue performance of laser shock peened Ti6Al4V and Al6061‐T6 alloys

Fatigue performance of laser shock peened Ti6Al4V and Al6061‐T6 alloys

A Critical Review of the Material Characteristics of Additive Manufactured IN718 for High Temperature Application

Weld Geometry, Mechanical Properties, Microstructure and Chemical Composition of AA6063 in Tungsten Inert Gas Welding with Intermittent Controlled Wire Feeding Method

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