Improvement in fatigue life of Al 7475-T7351 alloy specimens by applying ultrasonic and microshot peening

Ramos, Rui; Ferreira, Nuno; Ferreira, José Pedro; Capela, C.; Batista, A. C.

doi:10.1016/j.ijfatigue.2016.06.022

Cited by 45 publications

(21 citation statements)

References 32 publications

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“…Flat cleavage facets are visible near the inner surface, which advocates the belief that the fracture became predominantly a transgranular one. This result is of the same opinion with previous research reporting that corrosion‐fatigue fracture of aluminum alloys 7075 is predominantly transgranular …”

Section: Resultssupporting

confidence: 92%

“…The significant increase in corrosion‐fatigue life was ascribed to the induced compressive residual stresses resulting from the blasting process . There was no phase transformation due to blasting process as indicated by the optical images of the specimens in Figure .…”

Section: Resultsmentioning

confidence: 88%

“…The significant increase in corrosion-fatigue life was ascribed to the induced compressive residual stresses resulting from the blasting process. 1,3,14,26,27 There was no phase transformation due to blasting process as indicated by the optical images of the specimens in Figure 6. Therefore, it is assumed that any possible surface grain refinement created by the blasting process took place in a nanolevel (not apparent by the optical microscopy images).…”

Section: Corrosion-fatigue Behaviormentioning

confidence: 90%

“…This result is of the same opinion with previous research reporting that corrosion-fatigue fracture of aluminum alloys 7075 is predominantly transgranular. [27][28][29] Three distinct facture morphologies are determined from the SEM images of the anodized fractured surfaces across the thickness of the C-ring specimen. A nucleation site is obvious, presenting large river like marks pointing to the initiation site of crack propagation.…”

Section: Fracture Analysismentioning

confidence: 99%

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A study on corrosion‐fatigue behavior of AA7075‐T651 subjected to different surface modification treatments

Michailidis

Stergioudi

Ragousis

et al. 2019

Fatigue Fract Eng Mat Struct

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Two corrosive media were used (3.5 wt% NaCl aqueous solution and distilled water) to examine the corrosion‐fatigue behavior of AA 7075‐T651, subjected to various surface modifications (wire‐EDM, blasting, and anodizing). An in‐situ corrosion‐fatigue device was used to test the corrosion‐fatigue durability. The apparatus is able to generate cyclic loads within a corrosive solution. The mechanical loading is simulated with the aid of finite element method (FEM). At both corrosive environments, a prolongation of the corrosion‐fatigue life was achieved by the blasting procedure, compared with the as‐machined specimens under same conditions. Anodizing had a deleterious impact in all examined cases.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 88%

Section: Corrosion-fatigue Behaviormentioning

confidence: 90%

Section: Fracture Analysismentioning

confidence: 99%

See 2 more Smart Citations

A study on corrosion‐fatigue behavior of AA7075‐T651 subjected to different surface modification treatments

Michailidis

Stergioudi

Ragousis

et al. 2019

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Relevant literature showed that surface strengthening or smooth treatment of alloys can play an important role in delaying the initiation and propagation of fatigue cracks, such as shot peening and electro polishing [13,14]. For example, after shot peening, the surface of some aluminum alloys undergoes local plastic deformation can form a compressive stress field due to the introduced compressive residual stress, in this way the fatigue property is obviously improved [15][16][17][18][19]. After electropolishing, the surface is free from stress concentration, then it will hinder the fatigue crack nucleation, which has different effects on alloys with different strength, which is reported in some alloy steels and titanium aluminum alloys [14,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effect of different surface conditions on fatigue properties of 7N01 aluminum alloy and the behavioral mechanism of crack of the alloy under alternating load

Chen

Cai

Deng

et al. 2020

Mater. Res. Express

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In this paper, the surface of 7N01 aluminum alloy profile is sandblasted or electropolished. The influence of different surface conditions on its conditional fatigue strength and fatigue mechanism under the alternating load after prefabricated short crack are studied. Results show that the 7N01 aluminum alloy with sandblasting treatment has formed a work hardened layer and its fatigue strength is increased by 42.9% comparing with the original surface specimens. The fatigue strength of the 7N01 aluminum alloy after electropolishing is almost unchanged compared with the original specimen. The fatigue behavior of the 7N01 aluminum alloy after prefabricated side straight through the notch deviated from the theoretical smooth specimen law and long crack propagation law in which is a 'shortage effect'. When the notch size is smaller than the transition crack size a 0 , the fatigue limit of the notched specimen is lower than the fatigue limit of the smooth specimen. When the notch size is larger than the transition crack size, the fatigue limit of the long-notched specimen is still lower than that predicted by linear elastic fracture mechanics. Due to the 'short notch effect', the effective notch propagation threshold ΔK eff.th of the long crack is 0.39 Mpa m 1/2 based on the effective notch propagation size a 0 eff of the alloy.

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Recent Progress in Ultrasonic Surface Rolling: A Comprehensive Overview

Yang,

Huang,

et al. 2024

Adv Eng Mater

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Metals and their alloys have found extensive applications in numerous fields. Various surface modification techniques have received significant attention for their potential to improve the adaptability of materials to complex environments. One such technique, the ultrasonic surface rolling process (USRP), introduces a deformation layer by applying static stress and dynamic impacts to the surface of metallic materials. During USRP treatment, remarkable beneficial compressive residual stresses (CRS) and hardened layers are induced and, simultaneously, the surface finish of the material is improved. These modifications not only effectively suppress the initiation and propagation of fatigue cracks but also significantly enhance the mechanical properties, wear, and corrosion resistance of the materials, thereby greatly prolonging the service life of structural components. The review starts with the mechanisms of USRP, discussing grain refinement, control of surface roughness, and the introduction of beneficial CRS. Subsequent sections provide a comprehensive analysis of how these modifications impact material properties, encompassing hardness, plasticity, fatigue, wear, and corrosion resistance. Furthermore, it introduces the latest advancements in USRP technology, including thermal/electric pulse‐assisted USRP, its integration with other surface treatment methods, and its applications and prospects across various fields.

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Improvement in fatigue life of Al 7475-T7351 alloy specimens by applying ultrasonic and microshot peening

Cited by 45 publications

References 32 publications

A study on corrosion‐fatigue behavior of AA7075‐T651 subjected to different surface modification treatments

A study on corrosion‐fatigue behavior of AA7075‐T651 subjected to different surface modification treatments

Effect of different surface conditions on fatigue properties of 7N01 aluminum alloy and the behavioral mechanism of crack of the alloy under alternating load

Recent Progress in Ultrasonic Surface Rolling: A Comprehensive Overview

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