ace Integrity of Shot Peened Aluminium Alloy 7075-T651

Zupanc, U.; Grum, Janez

doi:10.5545/sv-jme.2010.142

Cited by 31 publications

(5 citation statements)

References 12 publications

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“…Shot peening has higher pressure duration and tends to increase surface hardening more markedly [3]. An example of this on AA7075-T6 is a study by Becker [21] which sees no increase in surface hardness for LSP AA7075-T6 and a 20% increase from shot peening; another is Zupanc and Grum [43] who see a 25% increase on AA7075-T651 after shot peening. Nevertheless, the studies do not discuss the effects of compressive residual stress on hardness testing, therefore further shows that the effects of the compressive residual stress start to quickly diminish with increasing depth from 0.2 mm, leading to the transition from negative to positive local mean stress.…”

Section: Estimates Are Based On Equivalent Tests (Not Presented In Th...mentioning

confidence: 99%

Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651

Sanchez

You

Leering

et al. 2021

International Journal of Fatigue

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Section: Estimates Are Based On Equivalent Tests (Not Presented In Th...mentioning

confidence: 99%

Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651

Sanchez

You

Leering

et al. 2021

International Journal of Fatigue

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“…SP results in a surface layer plastic deformation that generates residual compressive stress due to the application of multiple shot impacts on the part surface [10]. Various studies have reported that SP could improve the hardness, fatigue strength, and tensile strength of the part surface of conventional materials, such as Al alloys [11,12] and Ti6Al4V [13]. The main process parameters of SP are the Almen intensity and surface coverage [14].…”

Section: Introductionmentioning

confidence: 99%

Influence of Shot Peening on AlSi10Mg Parts Fabricated by Additive Manufacturing

Maamoun

Elbestawi

Veldhuis

2018

JMMP

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Abstract:The additive manufacturing (AM) of aluminum alloys promises to considerably enhance the performance of lightweight critical parts in various industrial applications. AlSi10Mg is one of the compatible Al alloys used in the selective laser melting of lightweight components. However, the surface defects obtained from the as-built parts affect their mechanical properties, and thus represent an obstacle to using them as final products. This study aims to improve the surface characteristics of the as-built AlSi10Mg parts using shot peening (SP). To achieve this goal, different SP intensities were applied to various surface textures of the as-built samples. The SP results showed a significant improvement in the as-built surface topography and a higher value of effective depth using 22.9 A intensity and Gp165 glass beads. The area near the shot-peened surface showed a significant microstructure refinement to a specific depth due to the dynamic precipitation of nanoscale Si particles. Surface hardening was also detected and high compressive residual stresses were generated due to severe plastic deformation. The surface characteristics obtained after SP could result in a significant improvement in the mechanical properties and fatigue strength, and thus promise performance enhancement for critical parts in various industrial applications.

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“…Another surface treatment method with the aim of increasing fatigue strength [8] is SP, whose development began in the late 1920s. During SP, the surface of the treated metallic component is exposed to a flux of small particles of high hardness.…”

Section: Fig 1 Schematic Representation Of the Lsp Processmentioning

confidence: 99%

Effects of Laser Shock Peening on the Surface Integrity of 18 % Ni Maraging Steel

Petan¹,

Ocaña²,

Grum³

2016

SV-JME

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Maraging steels represent a special group of ultrahigh strength steels which can be hardened by precipitation of intermetallic compounds at temperatures around 480 °C [1]. These steels have a high content nickel, cobalt, and molybdenum, while the content of carbon, considered an impurity, is kept as low as possible. Commercially available maraging steels can reach yield strengths up to 2400 MPa. In addition to high strength, they are characterized by high resistance to thermal fatigue, high fracture toughness, and good weldability [2]. In order to achieve martensitic transformation during quenching, lower cooling rates are sufficient, and there is less probability for cracking to occur. During age hardening there is very little distortion. Therefore, parts can be machined to final dimensions before the aging process. Maraging steels were primarily developed as high strength structural materials, intended for applications in aeronautical and aerospace. Later on, because of their superior mechanical properties, maraging steels started to be used in the manufacturing of tools [3] such as molds and die-casting dies. Maraging steels are used for the manufacturing of mechanical parts and tools which operate in demanding environments and conditions where they are subject to mechanical fatigue, thermomechanical fatigue, corrosion, and wear. These phenomena have a negative effect on fatigue life and may cause an early failure of the mechanical part.Fatigue behavior of highly stressed metallic components can be significantly improved by mechanical surface treatments [4] such as shot peening (SP) and laser shock peening (LSP). LSP is an innovative surface treatment [5] that can increase the fatigue strength of metallic parts by generating compressive residual stresses in the thin layer of the treated surface. During LSP, the surface of the treated component is exposed to nanosecond long laser pulses of intense energy from 5 J to 100 J [6]. The material in the interaction area with the laser beam vaporizes, and by further absorption of laser energy it ionizes and transforms into plasma. The newly created plasma continues to absorb the laser energy and generates pressure on the surface by transmitting shock waves into the treated material, Fig. 1. When shock wave stresses exceed the yield strength, plastic deformation occurs under the interaction zone between the laser beam and the material. The surrounding material prevents dilatation of the irradiated area of the surface layer, generating compressive residual stresses, which can reach depths up to 1 mm [7]. LSP treatment is far Effects of Laser Shock Peening on the Surface Integrity of 18 % Ni Maraging SteelPetan, L. -Ocaña, J. L. -Grum, J. Luca Petan 1 -José Luis Ocaña 2 -Janez Grum 1,* • Surface integrity of untreated and LSP treated maraging steel specimens was analyzed.• LSP generated compressive residual stresses in the maraging steel surface layer.• Strain hardening of the maraging steel surface layer occurred after LSP.• High compressive residual stresses in combina...

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ace Integrity of Shot Peened Aluminium Alloy 7075-T651

Cited by 31 publications

References 12 publications

Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651

Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651

Influence of Shot Peening on AlSi10Mg Parts Fabricated by Additive Manufacturing

Effects of Laser Shock Peening on the Surface Integrity of 18 % Ni Maraging Steel

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