An analysis of residual stress fields caused by shot peening

Gao, Yu; Yao, Minyu; Li, Jinkui

doi:10.1007/s11661-002-0186-2

Cited by 57 publications

(33 citation statements)

References 2 publications

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“…The continuity condition requires the development of a compressive residual stress field (of typical depth 50 -500 µm) parallel to the free surface; a balancing tensile residual stress beneath this maintains force equilibrium in the component [7,8]. The magnitude and depth of the compressive residual stress field has been shown to be dependent on the peening process parameters [9] and target material [10].…”

Section: Introductionmentioning

confidence: 99%

The effect of shot peening on notched low cycle fatigue

Soady

Mellor

Shackleton

et al. 2011

Materials Science and Engineering: A

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The improvement in low cycle fatigue life created by shot peening ferritic heat resistant steel was investigated in components of varying geometries based on those found in conventional power station steam turbine blades. It was found that the shape of the component did not affect the efficacy of the shot peening process, which was found to be beneficial even under the high stress amplitude three point bend loads applied. Furthermore, by varying the shot peening process parameters and considering fatigue life it has been shown that the three surface effects of shot peening; roughening, strain hardening and the generation of a compressive residual stress field must be included in remnant life models as physically separate entities. The compressive residual stress field during plane bending low cycle fatigue has been experimentally determined using X-ray diffraction at varying life fractions and found to be retained in a direction parallel to that of loading and to only relax to 80% of its original magnitude in a direction orthogonal to loading. This result, which contributes to the retention of fatigue life improvement in low cycle fatigue conditions, has been discussed in light of the specific stress distribution applied to the components. The ultimate aim of the research is to apply these results in a life assessment methodology which can be used to justify a reduction in the length of scheduled plant overhauls. This will result in significant cost savings for the generating utility. KeywordsLow cycle fatigue, stress concentration, shot peening, residual stresses, ferritic heat resisting

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Section: Introductionmentioning

confidence: 99%

The effect of shot peening on notched low cycle fatigue

Soady

Mellor

Shackleton

et al. 2011

Materials Science and Engineering: A

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“…High compressive residual stresses increased the fatigue property because it delays or stops the initiation and propagation of micro-cracks 12,13) . On the other hand, ne domain size and high dislocation density slowed down the dislocation gliding, to lead to an improvement on yield strength 14,15) , which was mentioned above.…”

Section: Resultsmentioning

confidence: 99%

Effect of Shot Peening on Residual Stress and Microstructure in the Deformed Layer of Inconel 625

Jiang

2017

Mater. Trans.

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Effect of shot peening on residual stress and microstructure in the deformed layer of Inconel 625 was investigated. Residual stress and microstructure including the domain size, micro strain and dislocation density was characterized by X-Ray diffraction method (XRD). The results showed that shot peening (SP) can signi cantly improve the compressive residual stress and micro hardness. Moreover, microstructure evaluation revealed that smaller domains were re ned and the higher micro strain was induced by shot peening process. Thus a high dislocation density in the near-surface of the deformed layers was induced. Dual shot peening process could optimize the distribution of both compressive residual stress and the microstructure, which will help with the material fatigue and corrosion resistance.

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“…The region of interest was limited by a collimator to 1 mm 2 in area. Depth profiling was conducted step-by-step by removing a very thin layer of material (10,15,30,45 and final layer at 55 μm below the surface) in a 2 mm × 2 mm region by electropolishing. This experimental setup comply recommendations from standard SAE HS-784, 2003.…”

Section: Methodsmentioning

confidence: 99%

“…In the former, the RSs are treated as mean biaxial stresses superimposed on the stress field produced by external loading, in the latter case, the RSs are included as R-ratio and crack closure effects. In the vast majority of cases, RSs are estimated through experimental measurements taken on flat unnotched coupons using laboratory incremental layer removal X-ray diffraction (XRD) [15,16], incremental blind hole drilling [17,18], synchrotron X-ray [19,20] or neutron diffraction [21].…”

Section: Introductionmentioning

confidence: 99%

High Spatial Resolution Evaluation of Residual Stresses in Shot Peened Specimens Containing Sharp and Blunt Notches by Micro-hole Drilling, Micro-slot Cutting and Micro-X-ray Diffraction Methods

et al. 2016

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The moderately high lateral RS gradients (on the order of tens of MPa/μm) near shot peened notches in conjunction with the shallow treatment depth (some hundreds of microns) limit the application of far-field and/or high resolution synchrotron diffraction residual stress measurement techniques. Recently proposed Focused Ion Beam -Scanning Elecron Microscope -Digital Image Correlation (FIB-SEM-DIC) based micro mechanical stress relaxation methods for the measurement of residual stress at the micron scale became suitable techniques for local evaluation of residual stresses and stress gradients in shot peened specimens. In this paper ultra-high resolution (~0.5-0.8 μm depth and 5-10 μm lateral resolution) mechanical relaxation stress measurements were used to evaluate the stress variation local to individual peening dimples in ceramic (60-120 μm diameter beads) shot peened Al-7075-T651 double notched samples having 0.15, 0.5 and 2.0 mm radii using Micro-Hole Drilling (μHD), Micro-Slot Cutting (μSC) and micro X-ray Diffraction (μXRD) methods. The micron-sized sampling volumes enabled the stress to be evaluated in individual impact craters (dimples) showing significant point-to-point variation (~+/−150 MPa) (with certain dimples even recording tensile stresses). After around 30 μm of layer removal the heavily deformed region had largely been removed and the stress profile became much more homogeneous. At this depth the μHD and μSC results were in good accord with those from μXRD measurements which sample over a much larger volume (~40 μm depth × 50 μm laterally) showing an in-plane compressive stress of around 150 MPa far from the notches with the residual stress rising to about 200 MPa at a blunt (2 mm) notch and 500 MPa for a sharp (0.15 mm) one. Further, these recorded variations of residual stresses were correlated with microstructural features, e.g. grains, networks of sub-surface cracks, intermetallics and highly deformed sub-surface regions, revealed by large volume Serial Sectioning Tomography using Plasma Xe + Focus Ion Beam -Scanning Electron Microscope (PFIB-SEM), EDS and EBSD maps. This allowed for the first time characterize large volume (100 × 66 × 30 μm 3 ) of shot peened regions with resolution of dozens of nanometers and correlate residual stress depth profiles with 3D microstructural features. Finally, in (Benedetti et al. 2016, Int. J. Fatigue) these RS measurements are used to reconstruct the RS field through finite element (FE) analyses.

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An analysis of residual stress fields caused by shot peening

Cited by 57 publications

References 2 publications

The effect of shot peening on notched low cycle fatigue

The effect of shot peening on notched low cycle fatigue

Effect of Shot Peening on Residual Stress and Microstructure in the Deformed Layer of Inconel 625

High Spatial Resolution Evaluation of Residual Stresses in Shot Peened Specimens Containing Sharp and Blunt Notches by Micro-hole Drilling, Micro-slot Cutting and Micro-X-ray Diffraction Methods

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