Effect of shot peening on the fatigue properties of nickel-based superalloy GH4169 at high temperature

Zhao, Xiaohui; Zhou, Hongyang; Liu, Yu

doi:10.1016/j.rinp.2018.09.047

Cited by 37 publications

(8 citation statements)

References 17 publications

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“…The research on shot peening of the edges of Inconel 718 samples showed an increase in fatigue strength only in certain conditions [ 19 ]. Shot peening increases the fatigue strength of elements made of nickel alloys working at elevated temperatures [ 20 ]. Nickel alloys are treated with laser shot peening as well [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Surface Properties of Nickel Alloy Elements Exposed to Impulse Shot Peening with the Use of Positron Annihilation

Skoczylas

Zaleski

et al. 2021

Materials

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The paper presents the results of experimental studies on the impact of impulse shot peening parameters on surface roughness (Sa, Sz, Sp, Sv), surface layer microhardness, and the mean positron lifetime (τmean). In the study, samples made of the Inconel 718 nickel alloy were subjected to impulse shot peening on an originally designed stand. The variable factors of the experiment included the impact energy, the diameter of the peening element, and the number of impacts per unit area. The impulse shot peening resulted in changes in the surface structure and an increase in surface layer microhardness. After the application of impulse shot peening, the analyzed roughness parameters increased in relation to post-milling values. An increase in microhardness was obtained, i.e., from 27 HV 0.05 to 108 HV 0.05 at the surface, while the maximum increase the microhardness occur at the depth from 0.04 mm to 0.08 mm. The changes in the physical properties of the surface layer were accompanied by an increase in the mean positron lifetime τmean. This is probably related to the increased positron annihilation in point defects. In the case of small surface deformations, the increase in microhardness was accompanied by a much lower increase in τmean, which may indicate a different course of changes in the defect structure consisting mainly in modification of the dislocation system. The dependent variables were subjected to ANOVA analysis of variance (it was one-factor analysis), and the effect of independent variables was evaluated using post-hoc tests (Tukey test).

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Section: Introductionmentioning

confidence: 99%

Analysis of Surface Properties of Nickel Alloy Elements Exposed to Impulse Shot Peening with the Use of Positron Annihilation

Skoczylas

Zaleski

et al. 2021

Materials

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“…As discussed in Section 3.3, the shot peening creates the near-surface compressive residual stress field that increases the threshold of the crack initiation during fatigue. This reduces the probability of fatigue crack initiation, thus extending the service life of the component [38][39][40]. For the microscopic cracks already established in the materials, the compressive stress field has the ability to arrest small cracks that initiate at the surface and may lead to a nonpropagating crack [41,42].…”

Section: Residual Stressmentioning

confidence: 99%

Effects of shot peening and artificial surface defects on fatigue properties of 50CrV4 steel

Saklakoğlu

Bolouri

İrizalp

et al. 2021

Int J Adv Manuf Technol

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Shot peening processes are commonly used for improving the fatigue properties of steels. Shot peening introduces a compressive residual stress field in the near surface of steel, which can reduce or stop the growth of fatigue cracks and improve fatigue properties. This study experimentally investigated the effect of shot peening on the fatigue properties of 50CrV4 steel alloys with different artificial surface defects. Drilling tools were used to introduce different artificial defects with root radii of 0.585 mm and 0.895 mm on the surface of unpeened samples. The shot peening was applied to the drilled and undrilled samples. Scanning electron microscopy (SEM) observations, micro-hardness and X-ray diffraction residual stress measurements were conducted to analyse the characteristics of the shot-peened and unpeened samples. The results show that the shot peening leads to the transformation of the retained austenite to martensite in the near-surface microstructure. The hardness rates of the surface and near surface both increase by 8% after the shot peening. The peened samples exhibit compressive residual stresses with a high degree of isotropy in the near surface. The fatigue properties of samples were experimentally evaluated by conducting 3-point bending tests. The results indicate that the shot peening improves the fatigue life of drilled and undrilled samples. For the defects with the root radius of 0.895 mm, the shot peening leads to a 500% improvement in the fatigue life compared to unpeened samples regardless of defect depth. For the defects with the root radius of 0.585 mm, the improvement in fatigue life is 40% for the defect depth of 0.2 mm compared to unpeened samples. The improvement increases to 60% and 200% by increasing the defect depths to 0.4 mm and 0.6 mm. The fatigue properties are linked to the changes in the features of defects mainly caused by the deformation hardening and compressive residual stress after shot peening.

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“…The [6], and Zhao ref. [7] certified the improvement of fatigue life reached for SP is mainly due to large amounts of twins and high residual compressive stress. Klotz ref.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of the Composite Enhancement Layer of Bearing Ring

Liu¹,

Huang²,

Liang³

et al. 2020

WJM

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In this paper, the NU308 bearing rings were subjected to strengthen grinding treatment (SGT) at ambient temperature. And the running reliabilities of specimens that subjected to SGT and conventional treatment (CT) were respectively investigated by testing dynamic properties including the running temperature, vibrations, and surface burning. Moreover, the residual stress, microtopography, and microstructures on the cross-section were respectively tested with residual stress analyzer and field-emission scanning electron microscopy. The results showed that the running reliabilities of the specimen after SGT had been significantly improved with the reduction of running temperature, vibration, and surface burning. Further study showed that the specimen's surface was filled with disordered micropores after SGT compared to the regular strip texture on the CT specimen's surface, and the maximum residual compressive stress induced by SGT was about −900 MPa. Moreover, the thickness of the residual compressive stress layer was over 180 µm, while the thickness of severe plastic deformation layer was about 50 µm.

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Effect of shot peening on the fatigue properties of nickel-based superalloy GH4169 at high temperature

Cited by 37 publications

References 17 publications

Analysis of Surface Properties of Nickel Alloy Elements Exposed to Impulse Shot Peening with the Use of Positron Annihilation

Analysis of Surface Properties of Nickel Alloy Elements Exposed to Impulse Shot Peening with the Use of Positron Annihilation

Effects of shot peening and artificial surface defects on fatigue properties of 50CrV4 steel

Preparation and Properties of the Composite Enhancement Layer of Bearing Ring

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