Surface characteristics and fatigue behavior of shot peened Inconel 718

Klotz, T.; Delbergue, Dorian; Bocher, Philippe; Lévesque, Martin; Brochu, Myriam

doi:10.1016/j.ijfatigue.2018.01.005

Cited by 154 publications

(82 citation statements)

References 22 publications

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“…The crack initiation occurred from the surface of the specimens and then propagated into the interior of the machined surface. A similar phenomenon was observed by Klotz et al [28] who found that the crack initiated from the surface of machined Inconel 718 and presented multiple crack sources. Figure 10a shows a typical crack initiation region under higher magnification of the SI surface condition.…”

Section: Evaluation Of Sifsupporting

confidence: 83%

Effects of Machining Induced Residual Shear and Normal Stresses on Fatigue Life and Stress Intensity Factor of Inconel 718

Hua

Wang

2019

Applied Sciences

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Residual shear stresses and normal stresses induced by machining affect the fatigue performance of components. Thus, residual shear and normal stresses should be considered simultaneously when evaluating the influence of residual stress on fatigue performance. In the present paper, the influences of residual shear and normal stresses on the fatigue life and stress intensity factor (SIF) of turned Inconel 718 were investigated. Firstly, the cos α measurement method was utilized to calculate the residual shear stress and residual normal stress of turned Inconel 718. Then, the combined effects of residual shear and normal stresses on fatigue life were evaluated through uniaxial tension–tension fatigue tests. Thirdly, a prediction model for the SIF was proposed by taking the residual shear and normal stresses into account. Finally, the predicted SIF was validated by the published experimental data from the literature. The predicted results of the proposed model generally agreed well with the available experimental data.

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Section: Evaluation Of Sifsupporting

confidence: 83%

Effects of Machining Induced Residual Shear and Normal Stresses on Fatigue Life and Stress Intensity Factor of Inconel 718

Hua

Wang

2019

Applied Sciences

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“…σrmax is around −108. 22 MPa, situated at 10 μm below the surface. The surface residual stress σrsur and maximum compressive residual stress σrmax after TCP process is much small than that of FT process.…”

Section: Subsurface Characteristicsmentioning

confidence: 99%

“…When they are present in the processing feed direction, the carbides are too hard to flow with the plastic layer metal of the specimen, resulting in cracking, which will be removed as the chips, then leave "cavity" on the machined surface. Klotz et al [22] reported that the machined Inconel 718 surface appears damaged carbide. After the FT process, the depth of plastic deformation layer h M is approximately 2 µm.…”

Section: Subsurface Characteristicsmentioning

confidence: 99%

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Effect of Turning and Surface Polishing Treatments on Surface Integrity and Fatigue Performance of Nickel-Based Alloy GH4169

Zhang

Yao

2018

Metals

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In this paper, the effects of turning and surface polishing treatments on surface integrity and fatigue properties of superalloy GH4169 were investigated. Finish turning (FT), surface circumferential polishing treatment (TCP), surface oblique texture (TCPO), and surface axial texture (TCPA) were applied to GH4169 superalloy. The surface roughness, surface topography, residual stress, microhardness, and microstructure after different processes were studied. Rotating bending fatigue tests were carried out to investigate the effects of surface integrity and surface texture direction on the fatigue performance of GH4169. The experiments reveal that the TCPA specimens present the longest fatigue life of 15.01 × 10 4 cycles. By comparison with the FT, TCP, and TCPO specimens, the fatigue lives of TCPA specimens are increased by 134.2%, 183.7%, and 96.2%, respectively. Single crack initiation source is observed for TCPA specimen. It is mainly attributed to the small surface stress concentration factor and surface axial texture.

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“…To meet the requirements of industries such as the automotive and aerospace industry, finishing processes as for example shot peening are used to increase durability of highly stressed parts. Thereby it is possible to improve the fatigue performance by projecting small, hard particles at high velocity onto a metallic part which introduces compressive residual stresses and strain hardening [1,2]. Besides improved strength properties these industries also demand further development of lightweight materials to reduce weight [3,4].…”

Section: Introductionmentioning

confidence: 99%

Shot peening using spherical micro specimens generated in high‐throughput processes

Kämmler

Wielki

Guba

et al. 2019

Materialwissenschaft Werkst

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Mechanical surface treatment processes like shot peening induce plastic deformation in the near surface areas of the peened workpiece leading to changes in surface and subsurface properties, e. g. hardness alteration and generation of compressive residual stress. While changes of the processed part are desired because of the lifetime extending influence, changes of the shot material are normally neglected as it is chosen to be highly resistant. Within this work plastic deformation of the shot material X210Cr12 and AlSi12 is examined. By investigating the plastic deformation of the particles, an indirect analysis of material properties, e. g. the yield stress or the hardness, is possible. A consideration of the particle velocities also enables conclusions about the materials properties. Those properties are conventionally obtained in a material, time, and cost intensive way. Using the same jet pressure, the investigations show lower velocities and less pronounced plastic deformation for the X210Cr12 specimens. Due to their higher mass, the X210Cr12 particles of same diameter are accelerated slower and therefore reach a lower impact velocity compared to AlSi12 particles. Furthermore, the lower plastic deformation at identical velocities can be explained with the higher yield stress of the X210Cr12 particles.

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Surface characteristics and fatigue behavior of shot peened Inconel 718

Cited by 154 publications

References 22 publications

Effects of Machining Induced Residual Shear and Normal Stresses on Fatigue Life and Stress Intensity Factor of Inconel 718

Effects of Machining Induced Residual Shear and Normal Stresses on Fatigue Life and Stress Intensity Factor of Inconel 718

Effect of Turning and Surface Polishing Treatments on Surface Integrity and Fatigue Performance of Nickel-Based Alloy GH4169

Shot peening using spherical micro specimens generated in high‐throughput processes

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