Investigation of Effect of Pre-Strain on Very High-Cycle Fatigue Strength of Austenitic Stainless Steels

Ogawa, Takeshi; Nakane, Motoki; MASAKI, Kiyotaka; HASHIMOTO, Shota; Ochi, Yasuo; Asano, K.

doi:10.1299/jpes.3.38

Cited by 12 publications

(3 citation statements)

References 8 publications

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“…and revealed that sub-surface crack initiation hardly occurred, while the highly pre-strained specimens showed sub-surface crack initiation with a typical fish-eye pattern in HCF region 4), 5) . Müller-Bollenhagen et al had also revealed that sub-surface crack initiation was recognized in type 304 with very high volume fraction of strain-induced martensitic phase 7) .…”

Section: Introductionmentioning

confidence: 95%

Effect of Ultrasonic Shot Peening on High Cycle Fatigue Behavior in Type 304 Stainless Steel at Elevated Temperature

Kakiuchi

Uematsu

Hasegawa

et al. 2016

J. Soc. Mat. Sci., Japan

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Ultrasonic shot peening was applied to type 304 austenitic stainless steel and four-point rotating bending fatigue tests were performed at room temperature (R.T.) and 573K up to 10 8 cycles. The fatigue strengths at 573K were much lower than those at R.T. irrelevant to shot peening process. The shot-peened specimens exhibited higher fatigue strengths than untreated ones at both R.T. and 573K, indicating that shot peening had beneficial effect even at the elevated temperature of 573K. Clear fatigue limits were recognized in both shot-peened and untreated specimens at R.T. On the contrary, at 573K, fatigue failure occurred at high cycle fatigue (HCF) region (N > 2×10 6 cycles) in the shot-peened specimens, while not in the untreated ones. Fatigue crack initiated at the specimen surface due to cyclic slip deformation in the untreated specimens at R.T. and 573K and in the shot-peened ones at R.T. However the shot-peened specimens showed sub-surface crack initiation with a typical fish-eye pattern in the HCF failures at 573K. Inclusions were not recognized at the center of the fish-eye. The transition of crack initiation mechanism at 573K of shot-peened specimens could be attributed to the combined effects of the surface hardening by shot peening and the softening of material at the elevated temperature.

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Section: Introductionmentioning

confidence: 95%

Effect of Ultrasonic Shot Peening on High Cycle Fatigue Behavior in Type 304 Stainless Steel at Elevated Temperature

Kakiuchi

Uematsu

Hasegawa

et al. 2016

J. Soc. Mat. Sci., Japan

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“…Internal fracture originating from internal defects such as inclusions, so-called fish eye fracture, occurs in the gigacycle region for high-strength steels [2]. In contrast, for the austenitic stainless steels, it was reported that the fatigue failure originating from the surface to be dominant in the solution-annealed 316L SS [3,4].…”

Section: Introductionmentioning

confidence: 99%

Change in Mechanical Properties by High-Cycle Loading Up to Gigacycle for 316L Stainless Steel

Naoe

Harjo

Kawasaki

et al. 2020

Proceedings of the 14th International Workshop on Spallation Materials Technology

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At the J-PARC pulsed spallation neutron source, a target vessel made of 316L stainless steel suffers radiation damage under high proton and neutron radiation environment. In addition to the radiation damage, the target vessel suffers cyclic impact stress caused by the proton beam-induced pressure waves. We have observed cyclic hardening/softening phenomena during investigating gigacycle (10 9 cycles) fatigue strengths of solution annealed and cold-worked 316L by an ultrasonic fatigue test. In this study, to elucidate the cyclic hardening/softening phenomena up to the gigacycle loading, dislocation densities of the cyclic-loaded specimens by the ultrasonic fatigue method were measured using neutron diffraction method. The results showed that the dislocation of the cold-worked 316L was rearrangement and re-accumulate by cyclic loading whereas the dislocation densities of the solution annealed 316L was increased with increasing in the number of loading cycles. For both cases, change in the dislocation densities by cyclic loading were well correlated with the change of mechanical properties; hardness, residual strength.

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“…Owing to the demand for longer fatigue lives in industrial equipment and components, very high cycle fatigue is becoming important and studied for a wide range of materials (Sakai et al 2000, Shina et al 2003, Ogawa et al, 2009. As high strength steels and titanium alloys exhibit interior originated fatigue fracture in the very high cycle regime, many research works has been done on the fracture mechanism.…”

Section: Introductionmentioning

confidence: 99%

The influence of hydrogen on the very high cycle fatigue property and crack growth characteristics of bearing steels

Ogawa

Hasunuma

Inatomi

et al. 2018

Mechanical Engineering Letters

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In the present study, the growth rate of optically dark area (ODA) was investigated for two types of bearing steels using a fracture mechanics approach. Ultrasonic fatigue tests were performed for the specimens with hydrogen pre-charging followed by exposing in the atmosphere for a week in order to investigate the effect of hydrogen trapped by inclusions on the growth of ODA. Together with the constant amplitude loading test, twostep and repeated two-step variable amplitude loading tests were performed in order to determine the fatigue crack growth rate by beach marks. The results revealed that fatigue strengths of the both materials were reduced by the hydrogen pre-charging. The size of ODA increased with decreasing the stress amplitude at fracture so that the stress intensity factor range at the end of the ODA growth became a constant value ranging between 4.5 and 5.5 MPa m independent of the materials and the fatigue lives. ODA formation behavior is enhanced by trapped hydrogen by inclusions, which reduces the fatigue strength in the very high cycle fatigue regime.

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Investigation of Effect of Pre-Strain on Very High-Cycle Fatigue Strength of Austenitic Stainless Steels

Cited by 12 publications

References 8 publications

Effect of Ultrasonic Shot Peening on High Cycle Fatigue Behavior in Type 304 Stainless Steel at Elevated Temperature

Effect of Ultrasonic Shot Peening on High Cycle Fatigue Behavior in Type 304 Stainless Steel at Elevated Temperature

Change in Mechanical Properties by High-Cycle Loading Up to Gigacycle for 316L Stainless Steel

The influence of hydrogen on the very high cycle fatigue property and crack growth characteristics of bearing steels

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