Influence of shot peening parameters on high‐cycle fatigue strength of steel produced by powder metallurgy process

Akyildiz, Hamza K.; Külekçi, Mustafa Kemal; Eşme, Uğur

doi:10.1111/ffe.12324

Cited by 12 publications

(10 citation statements)

References 22 publications

(63 reference statements)

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“…On the other hand, an interesting issue related to this type of material is that it can be efficiently used for the manufacturing of complexly shaped components by means of the modern production techniques of additive manufacturing (AM). In particular, the aptitude of processing metallic materials and of fabricating geometrically complicated three‐dimensional parts or even microstructures makes this technique a really promising technology . The main applications are currently in the fields of microelectro‐mechanical systems (MEMS) in that of biomechanics and in blade manufacturing.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the aptitude of processing metallic materials and of fabricating geometrically complicated three-dimensional parts or even microstructures makes this technique a really promising technology. 7,8 The main applications are currently in the fields of microelectro-mechanical systems (MEMS) in that of biomechanics and in blade manufacturing. For instance, Clare et al 9 used the technology of selective laser melting to build three-dimensional Ni-Ti MEMS.…”

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confidence: 99%

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Influence of the build orientation on the fatigue strength of EOS maraging steel produced by additive metal machine

Croccolo

Agostinis

Fini

et al. 2016

Fatigue Fract Eng Mat Struct

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This paper presents a research dealing with the dependence of the fatigue strength of maraging steel parts, manufactured by direct selective laser sintering, on the production build orientation. Three sets of specimens have been manufactured according to the ISO 1143 Standard (2010) by EOSINT M280 additive manufacturing machine, with the following heat and mechanical treatments, in agreement with the recommendations by the material manufacturer and current literature. The expected outcomes are the Fatigue Limit values of the material and the maximum number of cycles observed at different stress levels for three different build orientations (three different angles, 0°, 45° and 90°, between the build direction and the longitudinal axis of the samples). The results have been processed and compared by statistical methods in order to determine the fatigue curves in the finite life domain and the fatigue limits, along with their confidence bands and intervals, and to investigate the significance of the build orientation factor.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Influence of the build orientation on the fatigue strength of EOS maraging steel produced by additive metal machine

Croccolo

Agostinis

Fini

et al. 2016

Fatigue Fract Eng Mat Struct

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show abstract

“…Roland et al [7] and Yang et al [8] showed that a stainless steel with surface mechanical attrition treatment and a pure Cu with surface mechanical grinding treatment had higher fatigue strength than the original materials, especially in high cycle fatigue regime. Other articles [10][11][12][13][14][15] also reported similar results of different materials with various types of surface treatments. All these investigations attributed the enhancement of the fatigue strength for the treated specimens or components to the grain refinement and the compressive residual stress caused by surface strengthening treatment.…”

Section: Introductionmentioning

confidence: 68%

Fatigue crack growth behavior in gradient microstructure of hardened surface layer for an axle steel

Zhang

Xie

Jiang

et al. 2017

Materials Science and Engineering: A

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A B S T R A C TThis paper experimentally investigated the behavior of fatigue crack growth of an axle steel with a surface strengthened gradient microstructure layer. First, the microstructure, residual stress and mechanical properties were examined as a function of depth from surface. Then the fatigue crack growth rate was measured via three point bending fatigue testing. The results indicated that fatigue crack growth rate decelerated first and then accelerated with the increase of crack length within the gradient layer. Especially, the fatigue crack was arrested in the gradient layer under relatively low stress amplitude due to the increase of threshold value for crack growth within the range of 3 mm from surface. Based on these results, the parameters of Paris equation and the threshold value of stress intensity factor range within the gradient layer were determined and a curved surface was constructed to correlate crack growth rate with stress intensity factor range and the depth from surface. The effects of microstructure, residual stress and surface notch on the crack growth behavior were also discussed.

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“…Several models exist for the competing mechanisms to predict fatigue behavior influenced by surface roughness and residual stresses . Additional process modeling efforts also predict the residual stress fields and surface roughness resulting from the shot peening process …”

Section: Introductionmentioning

confidence: 99%

Crack incubation in shot peened AA7050 and mechanism for fatigue enhancement

Chadwick

Ghanbari

Bahr

et al. 2017

Fatigue Fract Eng Mat Struct

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Shot peening is a dynamic cold-working process involving the impingement of peening media onto a substrate surface. Shot peening is commonly used as a surface treatment technique within the aerospace industry during manufacturing to improve fatigue performance of structural components. The compressive residual stress induced during shot peening results in fatigue crack growth retardation, improving the performance of shot-peened components. However, shot peening is a compromise between the benefit of inducing a compressive residual stress and causing detrimental surface damage. Because of the relatively soft nature of AA7050-T7451, shot peening can result in cracking of the constituent precipitate particles, creating an initial damage state. The aim of this paper is to understand the balance and fundamentals of these competing phenomena through a comparative study throughout the fatigue lifecycle of baseline versus shot-peened AA7050-T7451.Microstructure and surface topology characterization and comparison of the baseline and shot-peened AA7050-T7451 has been performed using scanning electron microscopy, electron backscatter diffraction, energy dispersive spectroscopy, and optical profilometry techniques. A residual stress analysis through interrupted fatigue of the baseline and shot-peened AA7050-T7451 was completed using a combination of X-ray diffraction and nanoindentation. The fatigue life performance of the baseline versus shot-peened material has been evaluated, including crack initiation and propagation. Subsurface particles crack upon shot peening but did not incubate into the matrix during fatigue loading, presumably due to the compressive residual stress field. In the baseline samples, the particles were initially intact, but upon fatigue loading, crack nucleation was observed in the particles, and these cracks incubated into the matrix. In damage tolerant analysis, an initial defect size is needed for lifetime assessment, which is often difficult to determine, leading to

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Influence of shot peening parameters on high‐cycle fatigue strength of steel produced by powder metallurgy process

Cited by 12 publications

References 22 publications

Influence of the build orientation on the fatigue strength of EOS maraging steel produced by additive metal machine

Influence of the build orientation on the fatigue strength of EOS maraging steel produced by additive metal machine

Fatigue crack growth behavior in gradient microstructure of hardened surface layer for an axle steel

Crack incubation in shot peened AA7050 and mechanism for fatigue enhancement

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