High-cycle and very high-cycle bending fatigue strength of shot peened spring steel

Myung, NohJun; Wang, Liang; Choi, Nak–Sam

doi:10.1007/s12206-021-1015-0

Cited by 4 publications

(6 citation statements)

References 37 publications

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“…This severe plastic deformation induced sharp notches and peeling on the surface of the specimens, as shown in Figure 9. Similarly, Myung et al [29] observed that micro-pits were occasionally generated on the shot peening-treated surface of SAE 9254 specimens, but not on the untreated surface. The defects noted above were detrimental to the fatigue properties of the treated materials.…”

Section: Surface Finishmentioning

confidence: 82%

“…In the research by Tian et al [31], SP induced a work-hardened layer of approximately 100 µm in the surface of a 2024-T351 aluminum specimen. Myung et al [29], Trško et al [12], Suh et al [30], and Shiozwa and Lu [10] also observed that material surface microhardness increased after performing SP on SAE 9254 steel, 50CrMo4 steel, 7075-T651 aluminum, and JIS SUJ2 steel specimens, respectively. The research from Gao et al [32] and Li et al [17] showed an increase in microhardness after performing SMAT on TC11 titanium and heattreated AM Ti-6Al-4V titanium specimens.…”

Section: Work-hardened Layermentioning

confidence: 94%

“…Shiozawa and Lu [10] performed rotary bending fatigue tests on SP-treated JIS SUJ2 steel specimens, and the test results showed that SP greatly improved the fatigue properties of the specimens in the HCF regime; however, the reverse effect was observed in the VHCF regime (reference Figure 6). In the research from Myung et al [29], rotary bending test results showed that the effects of SP on the fatigue properties of SAE 9254 steel specimens went from positive to negative at approximately Nf = 10 8 cycles. On the other hand, the study by Trško et al [12] showed an opposite trend in the improvement of fatigue properties after treating 50CrMo4 spring steel specimens with severe shot peening.…”

Section: Effects Of Sp Smat and Lspmentioning

confidence: 97%

“…SP can induce a plastic deformation zone in the surface region of metals; however, the standard SP treatment tends to encounter difficulties in inducing the nanograin layer and gradient microstructure due to milder plastic strain. Myung et al [29] observed a 20 µm-thick plastic deformation zone under the surface of SP-treated SAE 9254 steel specimens, and research from Suh et al [30] showed that SP induced a 100 µ m thick plastic deformation zone in the surface region of 7075-T651 aluminum specimens. Neither Myung et al [29] nor Suh et al [30] reported any observation of the nanograin layer and microstructure.…”

Section: Plastic Deformation Zone Nanograin Layer and Gradient Micros...mentioning

confidence: 99%

“…Myung et al [29] observed a 20 µm-thick plastic deformation zone under the surface of SP-treated SAE 9254 steel specimens, and research from Suh et al [30] showed that SP induced a 100 µ m thick plastic deformation zone in the surface region of 7075-T651 aluminum specimens. Neither Myung et al [29] nor Suh et al [30] reported any observation of the nanograin layer and microstructure. On the other hand, Trško et al [12] observed a 20 µm-thick nanograin layer after the severe shot peening treatment of 50CrMo4 steel specimens.…”

Section: Plastic Deformation Zone Nanograin Layer and Gradient Micros...mentioning

confidence: 99%

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Comparison of SP, SMAT, SMRT, LSP, and UNSM Based on Treatment Effects on the Fatigue Properties of Metals in the HCF and VHCF Regimes

Chen

Xue

2022

Metals

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This paper aims to provide a better understanding regarding the effects of shot peening (SP), surface mechanical attrition treatment (SMAT), laser shock peening (LSP), surface mechanical rolling treatment (SMRT), and ultrasonic nanocrystal surface modification (UNSM) on the fatigue properties of metals in high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) regimes. The work in this paper finds that SMRT and UNSM generally improve the high-cycle and very-high-cycle fatigue properties of metals, while SP, SMAT, and LSP can have mixed effects. The differences are discussed and analyzed with respect to the aspects of surface finish, microstructure and microhardness, and residual stress. SMRT and UNSM generally produce a smooth surface finish, while SP and SMAT tend to worsen the surface finish on metals, which is harmful to their fatigue properties. In addition to inducing a plastic deformation zone and increasing microhardness, surface treatments can also generate a nanograin layer and gradient microstructure to enhance the fatigue properties of metals. The distribution of treatment-induced residual stress and residual stress relaxation can cause mixed effects on the fatigue properties of metals. Furthermore, increasing residual stress through SP and SMAT can cause further deterioration of the surface finish, which is detrimental to the fatigue properties of metals.

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Section: Surface Finishmentioning

confidence: 82%

Section: Work-hardened Layermentioning

confidence: 94%

Section: Effects Of Sp Smat and Lspmentioning

confidence: 97%

Section: Plastic Deformation Zone Nanograin Layer and Gradient Micros...mentioning

confidence: 99%

Section: Plastic Deformation Zone Nanograin Layer and Gradient Micros...mentioning

confidence: 99%

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Comparison of SP, SMAT, SMRT, LSP, and UNSM Based on Treatment Effects on the Fatigue Properties of Metals in the HCF and VHCF Regimes

Chen

Xue

2022

Metals

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To the theoretical study of stress-strain state of motor vehicles suspension springs during shot peening

2023

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A theoretical study of the stress-strain state of helical cylindrical compression springs used in the suspension of vehicles during shot peening is carried out. The stress-strain state of the front suspension spring is studied by mechanical-mathematical methods and methods of the deformation theory of plasticity, in particular, by the method of small elastic-plastic deformations. It is established that shot peening reduces compression of the front suspension springs during pre-stressing by 2.54% due to an increase in the torque in the cross section of the coil by 4.30%. The results of the study can be used in the development of technology for the manufacture and restoration of expensive helical coil springs for the suspension of vehicles, in particular, in determining the required load of contact pre-stressing, taking into account shot peening.

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Mechanical Properties of Metallic Materials Processed by Surface Severe Plastic Deformation

2023

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This paper gives an overview about some mechanical properties of materials processed by surface severe plastic deformation (SSPD) techniques. SSPD processed materials are classified in terms of characteristics, and main generated parameters that determine the output properties of materials are presented. The influences of SSPD on mechanical properties of materials are then reviewed. Furthermore, the roles played by some parameters such as gradient microstructure, nanostructured layer, compressive residual stress (CRS) and surface integrity are highlighted by discussing their contributions. Finally, some conclusions are drawn and possible prospects for future research are underlined.

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High-cycle and very high-cycle bending fatigue strength of shot peened spring steel

Cited by 4 publications

References 37 publications

Comparison of SP, SMAT, SMRT, LSP, and UNSM Based on Treatment Effects on the Fatigue Properties of Metals in the HCF and VHCF Regimes

Comparison of SP, SMAT, SMRT, LSP, and UNSM Based on Treatment Effects on the Fatigue Properties of Metals in the HCF and VHCF Regimes

To the theoretical study of stress-strain state of motor vehicles suspension springs during shot peening

Mechanical Properties of Metallic Materials Processed by Surface Severe Plastic Deformation

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