Increase in Fatigue Limit of Gears by Compound Surface Refining Using Vacuum Carburizing, Contour Induction Hardening and Double Shot Peening

Matsui, Katsuyuki; Eto, Hirohito; Yukitake, Katsuya; Misaka, Yoshitaka; Ando, Kotoji

doi:10.1299/jsmea.45.290

Cited by 15 publications

(9 citation statements)

References 5 publications

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“…5 As the result, it can be considered that the defensive factor of stage I and II are the yield stress and residual stress, respectively. Based on this consideration, the correlation between the fatigue limit and the yield stress (σ Y ) + maximum compressive residual stress (σ rmax ) was analyzed.…”

Section: Discussionmentioning

confidence: 99%

“…The application range of σ Y + σ rmax was from 1200 to 5500 MPa. 5 Therefore, from the value of hardness and σ rmax with non-CP and CP specimen before fatigue test, the value of σ Y + σ rmax of each specimen was calculated as shown in Table 2. The yield stresses (σ Y ) were calculated from maximum hardness of diffusion zone using the following (1) σ Y + σ rmax increased 17% by the CP.…”

Section: Discussionmentioning

confidence: 99%

“…To increase the fatigue strength of automotive parts, the authors divided fatigue fracture processes into seven stages and analyzed the fatigue promotive and resistance factors of each stage systematically 5 . As the result, it can be considered that the defensive factor of stage I and II are the yield stress and residual stress, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…As the result, it was found that a linear relation exists between σ Y +σ rmax and the fatigue limit, and the limit becomes high according to the larger value of σ Y +σ rmax . The application range of σ Y +σ rmax was from 1200 to 5500 MPa 5 …”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Cavitation peening to improve the fatigue strength of nitrocarburized steel

Fukuda¹,

Matsui²,

Ishigami³

et al. 2008

Fatigue Fract Eng Mat Struct

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A B S T R A C T Shot peening is a commonly employed technique used to improve the fatigue strength of nitrocarburized components. However, the compound layer of the component can be broken by this technique. Cavitation peening (CP) is an alternative shotless technique, which can increase the fatigue strength of the component without separation of the compound layer. To evaluate the potential of CP as a means for improving fatigue strength, nitrocarburized carbon steel (JIS S50C) has been analyzed in the non-peened and CP conditions. The fatigue strength of CP specimens was increased by 15% in comparison with that of non-peened specimens. This increase in the fatigue strength of CP specimen was achieved by the increase in the maximum hardness and compressive residual stress within the diffusion zone.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Cavitation peening to improve the fatigue strength of nitrocarburized steel

Fukuda¹,

Matsui²,

Ishigami³

et al. 2008

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Hence, the surface damage from shot peening plays a significant role in determining the life. Following shot peening, a material's surface can be smoothed to further increase the life by approximately 10%, such techniques include electopolishing, fine particle shot peening, double shot peening (with a finer shot media), and secondary surface treatments (superfinishing, vibrostrengthening, etc). Since material is removed during the majority of these processes, it is paramount that sufficient subsurface residual stresses are developed during the initial shot peening process to enhance the fatigue life.…”

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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Determination of the optimal coverage for heavy-duty-axle gears in shot peening

Yan

Zhu

Chen

et al. 2021

Int J Adv Manuf Technol

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Pitting and wear often appear on heavy-duty-axle gears due to their harsh working conditions, such as high torques, high loads and poor lubrication. Shot peening is a popular surface strengthening method for gears. In order to ensure complete coverage during shot peening, 100%~200% coverage is usually prescribed for most gears. However, it is difficult to effectively improve the contact fatigue and wear resistance of heavy-duty-axle gears. Generally, increasing shot peening coverage can heighten the compressive residual stress for prolonging the service lifetime of gears. Whereas, high coverage levels may cause the deterioration of surface roughness, thus increase the noise and vibration of gears. To address this issue, this paper deals with the determination of optimal coverage for heavy-duty-axle gears by experimental tests. The influence of shot peening coverage on the surface integrity of gears is analyzed in terms of residual stress, microhardness, surface morphology and dislocation density. The results show that the maximum compressive residual stress increases first and then keeps stable with the increase of coverage, and the maximum value is −1172.10 MPa. The microhardness peak increases obviously in the beginning and then slowly rises with the increase of coverage, and the maximum value is 747.5 HV1.0. The surface roughness (Ra) decreases initially and then enhances with the increase of coverage, and the minimum value is 0.99 μm under the coverage of 1000%. The dislocation density increases with the increase of coverage, and the maximum value is 3.70×10 16 m -2 . Numerous damages (microscalings, spallings) occur on the treated gear tooth flank affecting the residual stress distribution and roughness under high coverage levels. Taking into consideration of service lifetime, working noise and economic efficiency, the coverage of 1000% is the optimal coverage for heavy-duty-axle gears in shot peening.

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Increase in Fatigue Limit of Gears by Compound Surface Refining Using Vacuum Carburizing, Contour Induction Hardening and Double Shot Peening

Cited by 15 publications

References 5 publications

Cavitation peening to improve the fatigue strength of nitrocarburized steel

Cavitation peening to improve the fatigue strength of nitrocarburized steel

Crack incubation in shot peened AA7050 and mechanism for fatigue enhancement

Determination of the optimal coverage for heavy-duty-axle gears in shot peening

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