3D laser shock peening – A new method for improving fatigue properties of selective laser melted parts

Kalentics, Nikola; Seijas, Manuel Ortega Varela de; Griffiths, Seth; Leinenbach, Christian; Logé, Roland E.

doi:10.1016/j.addma.2020.101112

Cited by 52 publications

(49 citation statements)

References 40 publications

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“…More investigation has to be done to find out the process-structure-propertyperformance relationship, utilising advanced material characterisation method such as EBSD or Transmission Electron Microscopy (TEM). There are other interesting research where LSP is being used as a post-processing step for AM metal components such as aluminium [153], stainless steel [154] and titanium alloy [142]. Kalentics et al [154,155] have proposed using LSP to tailor the residual stresses of stainless steel samples by moving the baseplate back and forth from a printing machine to a LSP station.…”

Section: Suitability Of Surface Enhancement Processmentioning

confidence: 99%

“…There are other interesting research where LSP is being used as a post-processing step for AM metal components such as aluminium [153], stainless steel [154] and titanium alloy [142]. Kalentics et al [154,155] have proposed using LSP to tailor the residual stresses of stainless steel samples by moving the baseplate back and forth from a printing machine to a LSP station. He has dubbed it as 3D LSP, an ex-situ LSP and AM process which has shown to increase both magnitude and depth of compressive residual stress.…”

Section: Suitability Of Surface Enhancement Processmentioning

confidence: 99%

“…Taken from[154], residual stress curve measured for 316L Stainless Steel for as-built (AB), LSP after AM (2D LSP) and ex-situ LSP on AM (3D LSP)…”

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confidence: 99%

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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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Section: Suitability Of Surface Enhancement Processmentioning

confidence: 99%

Section: Suitability Of Surface Enhancement Processmentioning

confidence: 99%

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

Yong¹,

Gibbons²,

West³

2020

Preprint

View full text Add to dashboard Cite

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“…The technique has been successfully implemented in aircraft turbine fan blades to improve their resistance against foreign object damage 3 as well as in nuclear plants to increase stress corrosion cracking resistance of weldments 4 . Apart from this, it has also found applications in improving fatigue life of automotive parts 5 and as postprocessing method in additive manufacturing 6 …”

Section: Introductionmentioning

confidence: 99%

“…4 Apart from this, it has also found applications in improving fatigue life of automotive parts 5 and as postprocessing method in additive manufacturing. 6 Ever since the invention of LSP in 1960s, 7 a number of studies have been dedicated to understand its mechanism and potential for industrial applications. Early studies by Peyre and Fabbro 8 established physics behind pressure generation in confined mode and how plasmainduced shock wave generates residual compressive stresses during LSP.…”

Section: Introductionmentioning

confidence: 99%

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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Recent Developments and Novel Applications of Laser Shock Peening: A Review

2021

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Wear, corrosion, and fatigue are responsible for more than 80% of the failures of metallic materials. As most failures caused by wear, corrosion, and fatigue initiate from the material surface, surface integrity has a crucial impact on the overall performance of the materials. Surface integrity characteristics, including hardness, microstructure, morphology, roughness, and residual stress status, can significantly affect the wear and corrosion behavior. By improving hardness and introducing beneficial compressive residual stresses in the near-surface region, laser shock peening (LSP) can significantly improve the fatigue performance of metallic materials. In the LSP process, light from a high-energy pulsed laser penetrates through the transparent confinement media and irradiates the ablative coating, quickly heating the affected area to a high temperature and generating high-pressure plasma. The expansion of the plasma causes a shockwave that can plastically deform the target metals, resulting in work hardening and compressive residual stresses. Compared with shot peening (SP), LSP has the following advantages. 1) LSP can produce deeper layers of compressive residual stresses; 2) the process parameters in LSP can be precisely controlled; 3) the surface integrity of the parts after LSP is improved without the need for postprocessing; 4) LSP can be used to treat components with complex geometry; and 5) LSP has a high processing efficiency and makes for a clean working environment. Because LSP represents a new generation of surface strengthening technology that can replace SP, it has gained wide attention. Askar'yan and Moroz measured the pressures exerted by a high-intensity laser beam on the surface of a metal target [1] and found that this pressure is sufficient for steering space vehicles. However, the experiments were conducted under vacuum conditions to prevent dielectric breakdown, and such conditions are not practical for use in industry. [2] Anderholm at Sandia Laboratories irradiated an aluminum film covered in quartz with a laser beam and found that the presence of a transparent confinement layer can significantly increase the shock pressure. [3] Although this experiment was also conducted in vacuum, it proved that with the presence of a transparent confinement layer, a laser power density that does not cause dielectric breakdown in air can also generate a sufficiently large shock pressure. This observation is of great significance for the later industrial applications that involve laser-generated shockwaves.Fairand et al. at Battelle Memorial Institute changed the microstructure of 7075 aluminum alloy through short-pulse, laser-induced shockwaves with a high power density, and they found that after processing, the stress corrosion cracking (SCC) resistance and fatigue performance of the alloy improved. [4] This is a key event in the development of LSP; after this study, the National Science Foundation of the United States began to support the investigation of LSP. Clauer et al. [5] changed the intensity ...

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3D laser shock peening – A new method for improving fatigue properties of selective laser melted parts

Cited by 52 publications

References 40 publications

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

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

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

Recent Developments and Novel Applications of Laser Shock Peening: A Review

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