Effect of Controlled Shot Peening and Laser Shock Peening on the Fatigue Performance of 2024-T351 Aluminum Alloy

Rodopoulos, C. A.; Romero, Jose Solis; Curtis, Sean A.; Rios, E. R. de los; Peyre, P.

doi:10.1361/105994903770342944

Cited by 72 publications

(47 citation statements)

References 4 publications

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“…The larger the depth, the longer CRS will interact with the surface crack, resulting in a slower crack propagation and a longer fatigue life. Compared to other similar processes such as Shot Peening (SP) or Ultrasonic Shot Peening (USP), LSP treatment introduces CRS to a larger depth, thus leading to an increase in fatigue life of LSP samples compared to SP and USP samples [27,32,39,30,[40][41][42]. The proposed strategy of combining SLM with LSP has a goal of further increasing the depth and amount of CRS in the near surface region.…”

Section: Introductionmentioning

confidence: 99%

Tailoring residual stress profile of Selective Laser Melted parts by Laser Shock Peening

Kalentics

Boillat

Peyre

et al. 2017

Additive Manufacturing

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Selective laser melting Laser shock peening 3D Laser shock peening Residual stress profile 15-5 PH stainless steel 316L stainless steel a b s t r a c t The paper describes a new approach in controlling and tailoring residual stress profile of parts made by Selective Laser Melting (SLM). SLM parts are well known for the high tensile stresses in the as -built state in the surface or subsurface region. These stresses have a detrimental effect on the mechanical properties and especially on the fatigue life. Laser Shock Peening (LSP) as a surface treatment method was applied on SLM parts and residual stress measurements with the hole -drilling method were performed. Two different grades of stainless steel were used: a martensitic 15-5 precipitation hardenable PH1 and an austenitic 316L. Different LSP parameters were used, varying laser energy, shot overlap, laser spot size and treatments with and without an ablative medium. For both materials the as-built (AB) residual stress state was changed to a more beneficial compressive state. The value and the depth of the compressive stress was analyzed and showed a clear dependence on the LSP processing parameters. Application of LSP on SLM parts showed promising results, and a novel method that would combine these two processes is proposed. The use of LSP during the building phase of SLM as a "3D LSP" method would possibly give the advantage of further increasing the depth and volume of compressive residual stresses, and selectively treating key areas of the part, thereby further increasing fatigue life.

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Section: Introductionmentioning

confidence: 99%

Tailoring residual stress profile of Selective Laser Melted parts by Laser Shock Peening

Kalentics

Boillat

Peyre

et al. 2017

Additive Manufacturing

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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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Effect of Controlled Shot Peening and Laser Shock Peening on the Fatigue Performance of 2024-T351 Aluminum Alloy

Cited by 72 publications

References 4 publications

Tailoring residual stress profile of Selective Laser Melted parts by Laser Shock Peening

Tailoring residual stress profile of Selective Laser Melted parts by Laser Shock Peening

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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