Influence of Severe Shot Peening on the Surface State and Ultra-High-Cycle Fatigue Behavior of an AW 7075 Aluminum Alloy

Trško, Libor; Guagliano, Mario; Bokůvka, Otakar; Nový, František; Jambor, Michal; Florková, Zuzana

doi:10.1007/s11665-017-2692-9

Cited by 45 publications

(33 citation statements)

References 27 publications

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“…This was confirmed by [27] where fatigue tests in the low-cycle, high-cycle and ultra-high cycle regions were carried out and the whole S-N curve is characteristic with low-scatter data. Also, results of the fatigue tests of the NP material in the high-and ultra-high cycle regions, provided in [5], confirmed the low scatter of the fatigue tests results in conditions of ultrasonic fatigue testing. …”

Section: Fatigue Life Analysissupporting

confidence: 64%

“…The process of the creation of this layer with superior mechanical properties is characterized by three main mechanisms: work-hardening (increase in the dislocation density); introduction of compressive residual stresses; and grain refinement [1,2,4,5,8,[14][15][16][17][18]28].…”

Section: Discussionmentioning

confidence: 99%

“…Full fatigue life results were published in [5], while this work is focused only on the fatigue fracture surface character of the peened material. Treatment with each intensity was done on two ultrasonic fatigue test specimens used for fatigue tests at 20 kHz frequency (Lasur, Asnières, France) [26] (Figure 2).…”

Section: Metals 2018 8 X For Peer Review 3 Of 19mentioning

confidence: 99%

“…In many studies, the positive effect on fatigue life of all sorts of engineering materials, such as steels [2][3][4], aluminium [5,6], magnesium [7,8], titanium [9] and nickel [10] alloys, was proven. The fatigue life improvement is a result of a complex modification of the surface layer's structural state by increasing the dislocation density (deformation strengthening), grain refinement, and by accumulation of the compressive residual stresses, which slow down the fatigue crack initiation process and increase the resistance to fatigue crack propagation in the early stages of fatigue damage [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Study of Relation between Shot Peening Parameters and Fatigue Fracture Surface Character of an AW 7075 Aluminium Alloy

Trško

Fintová

Nový

et al. 2018

Metals

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Shot peening is a well-known surface treatment method used for fatigue life improvement of cyclically loaded structural components. Since three main variables are considered in the peening process (peening intensity, coverage and peening media type), there is no direct way to choose the best combination of treatment parameters for the best performance, thus it has to be based on experience and laboratory tests. When shot peening is performed with inadequate parameters, or the peening process is not stable in time (decrease of the peening pressure, deterioration of the peening media and so on), it can result in significant degradation of the treated component fatigue properties, what is commonly called as the "overpeening" effect. When a premature fatigue fracture occurs in operation, the fracture surface analysis is usually the most important method of revealing the damage mechanism. This work is aimed at the study of the relation between the shot peening parameters and the fatigue fracture surface character on an AW 7075 aluminium alloy with an objective of identifying marks of overpeening and investigating the fatigue crack initiation mechanism. After performing the tests, it was observed that shot peening with optimized parameters creates a surface layer that is able to change the mechanism of the fatigue crack propagation and improve fatigue strength. On the other hand, using extensive peening parameters decrease the fatigue strength due to the creation of surface cracks and surface layer delamination.

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Section: Fatigue Life Analysissupporting

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Section: Metals 2018 8 X For Peer Review 3 Of 19mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of Relation between Shot Peening Parameters and Fatigue Fracture Surface Character of an AW 7075 Aluminium Alloy

Trško

Fintová

Nový

et al. 2018

Metals

Self Cite

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“…Libor et al [17] report that roughness is strongly increased because it induces severe plastic deformation that causes crystallite refinement in the surface layers. The roughness value of the non-shot peening specimen increases significantly (133%) after shot peening in the different shot distance Nordin and Alfredsson [13] report that the surface roughness increased with increasing intensity of a given coverage.…”

Section: Surface Roughnessmentioning

confidence: 99%

Effect of Shot Peening in Different Shot Distance and Shot Angle on Surface Morphology, Surface Roughness and Surface Hardness of 316L Biomaterial

Maliwemu

Malau

Iswanto

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Shot peening is a mechanical surface treatment with a beneficial effect to generate compressive residual stress caused by plastic deformation on the surface of material. This plastic deformation can improve the surface characteristics of metallic materials, such as modification of surface morphology, surface roughness, and surface hardness. The objective of this study is to investigate the effect of shot peening in different shot distance and shot angle on surface morphology, surface roughness, and surface hardness of 316L biomaterial. Shot distance was varied at 6, 8, 10, and 12 cm and shot angle at 30, 60, and 90 o , working pressure at 7 kg/cm 2 , shot duration for 20 minutes, and using steel balls S-170 with diameter of 0.6 mm. The results present that the shot distance and shot angle of shot peening give the significant effect to improve the surface morphology, surface roughness, and surface hardness of 316 L biomaterial. Shot peening can increase the surface roughness by the increasing of shot distance and by the decreasing of shot angle. The nearest shot distance (6 cm) and the largest shot angle (90 o ) give the best results on the grain refinement with the surface roughness of 1.04 m and surface hardness of 534 kg/mm 2 .

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Enhancing the Structural Performance of Lightweight Metals by Shot Peening

Bagherifard

2019

Adv Eng Mater

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Lightweight metals and metal alloys provide the opportunity to fulfill the exigent weight‐saving requirements for structural components. Mechanical surface treatments, in particular, shot peening and other varieties of impact‐based surface treatments are found to be able to significantly promote the structural application of lightweight metals through enhancing their mechanical performance. Moreover, these treatments have substantiated a notable prospect to modulate the surface–environment interaction of the treated material, bringing in original functionalities in multiple fields of application. Herein, the current state‐of‐the‐art in the implementation of shot peening‐based surface treatments is reviewed regarding lightweight metallic materials. The recent advancements are described focusing on the foremost characteristics of the major lightweight metals commonly used in aerospace, automotive, and biomedical sectors. Emergent applications and the existing challenges are highlighted. Lastly, future perspectives on tailoring the effects of shot peening‐based mechanical surface treatments to boost the appeal of lightweight metals as structural components are provided.

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Influence of Severe Shot Peening on the Surface State and Ultra-High-Cycle Fatigue Behavior of an AW 7075 Aluminum Alloy

Cited by 45 publications

References 27 publications

Study of Relation between Shot Peening Parameters and Fatigue Fracture Surface Character of an AW 7075 Aluminium Alloy

Study of Relation between Shot Peening Parameters and Fatigue Fracture Surface Character of an AW 7075 Aluminium Alloy

Effect of Shot Peening in Different Shot Distance and Shot Angle on Surface Morphology, Surface Roughness and Surface Hardness of 316L Biomaterial

Enhancing the Structural Performance of Lightweight Metals by Shot Peening

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