Evaluation of Residual Stress Distribution in Shot-Peened Steel by Synchrotron Radiation

Akiniwa, Yoshiaki; Tanaka, Keisuke; Suzuki, Kenji; Yanase, Emiko; Nishio, Koji; Kusumi, Yukihiro; Okado, Hideki; Arai, Kazuo

doi:10.2472/jsms.52.764

Cited by 29 publications

(16 citation statements)

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“…This beam line yields X-rays with energy levels ranging from 5 and 115 keV and is equipped with a seven-circle goniometer. The constant penetration depth method (Akiniwa et al , 2003; Akiniwa and Kimura, 2008; Bonarski et al , 1994; Kumar et al , 2006) was adopted for the stress measurement by using high-energy X-rays with energy levels from 10 to 72 keV. Several diffraction profiles of single peaks and overlapping peaks were used for stress measurement.…”

Section: Methodsmentioning

confidence: 99%

“…The penetration depth was set to be from 0.5 to 250 μ m and was calculated by Eq. (1) (Akiniwa et al , 2003; Akiniwa and Kimura, 2008), where θ 0 is the diffraction angle from stress-free materials and μ is the linear absorption coefficient. The values of ω and χ are angles of inclination between the incident X-rays and the specimen surface.…”

Section: Methodsmentioning

confidence: 99%

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Effect of residual stresses on fatigue strength of severely surface deformed steels by shot peening

2009

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The compressive stress distribution below the specimen surface of severely surface deformed steels by shot peening was investigated by using laboratory X-rays and high-energy X-rays from a synchrotron radiation source, SPring-8 in the Japan Synchrotron Radiation Research Institute. Medium carbon steel plates were heat treated in two different conditions. The Vickers hardness of materials A and B after heat treatment is 408 and 617 HV, respectively. The specimens were shot peened with fine cast iron particles of the size of 50 m. The coverage was selected to be 5000%. For the synchrotron radiation, by using the monochromatic X-ray beam with several energy levels, the stress values at the arbitrary penetration depth were measured by the constant penetration depth method. The shot-peened specimens were fatigued under four-point bending. The improvement of fatigue strength of material A was not so large because of large surface roughness. On the other hand, for material B, the surface roughness was smaller and the fatigue strength was higher than that of ground specimens.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effect of residual stresses on fatigue strength of severely surface deformed steels by shot peening

2009

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“…However, the wavelength of light sources used at a laboratory is too long for measuring the internal residual stress. Then the residual stress measurement in the in-plane direction under the subsurface using constant penetration depth method 14) was performed at BL22XU at SPring-8, where the short wavelength can be used and the internal residual stress can be measured. The X-ray energies were 0.04130 and 0.01856 nm and the irradiated area made by divergent slit was 1:0 Â 0:2 mm 2 .…”

Section: Target Container Windowmentioning

confidence: 99%

Mitigation Technologies for Damage Induced by Pressure Waves in High-Power Mercury Spallation Neutron Sources (I)—Material Surface Improvement—

Naoe

Futakawa

Shoubu

et al. 2008

Journal of Nuclear Science and Technology

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Liquid-mercury target systems for MW-class spallation neutron sources are being developed in the world. Proton beams will be used to induce the spallation reaction. At the moment the proton beam hits the target, pressure waves are generated in the mercury because of the abrupt heat deposition. The pressure waves interact with the target vessel leading to negative pressure that may cause cavitation along the vessel wall. Localized impacts by microjets and/or shock waves that are caused by cavitation bubble collapse impose pitting damage on the vessel wall. Bubble collapse behavior was observed by using a high-speed video camera, as well as simulated numerically. Localized impact due to cavitation bubble collapse was quantitatively estimated through comparison between numerical simulation and experiment. A novel surface treatment technique that consists of carburizing and nitriding processes was developed and the treatment condition was optimized to mitigate the pitting damage due to localized impacts.

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“…The other specimen was shot-peened to introduce a compressive residual stress in the surface layer. These annealed and shot-peened specimens were the same specimens used in our previous study (6) . The distributions of the residual stress were measured by the surfaceremoval method combined with the conventional sin 2 ψ method.…”

Section: Materials and Specimensmentioning

confidence: 99%

“…9, the open circles indicate the residual stress measured by the strain scanning method. The solid circles indicate the residual stress obtained in our previous study (6) , where the surface layer of the shot-peened specimen was removed successively by electropolishing and the stress measurement by the sin 2 ψ method using Cr-Kα radiation was repeated. The value of the stress measured by sin 2 ψ method were corrected by taking account of the surface removal.…”

Section: Use Of Analyzer To Reduce the Surface Aberration Effectmentioning

confidence: 99%

High Space-Resolutive Evaluation of Subsurface Stress Distribution by Strain Scanning Method with Analyzer Using High-Energy Synchrotron X-Rays

Shobu

Мizuki

Suzuki

et al. 2006

JSME Int. J., Ser. A

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The surface aberration effect in the strain scanning method with a Ge analyzer was examined using high-energy X-rays from the undulator synchrotron source. The synchrotron X-rays from the undulator source had an enough intensity for the strain scanning method using a goniometer with the analyzer. The use of a Ge (111) analyzer showed remarkable reduction of the surface aberration effect. However, there still existed the surface aberration for the very-near surface region from the surface to the depth of 50 µm. A correction method was proposed by taking into account of the effects of the divergence of the Ge analyzer, the mis-setting of the analyzer and the X-ray attenuation. The proposed correction method was very useful for eliminating the surface aberration effect. The correction method enables a high space-resolutive evaluation of the subsurface stress distribution. The method was successfully applied to the determination of the residual stress distribution of the shot-peened steel. A precise d 0 value of the strain-free lattice spacing necessary was determined from the surface stress measured by the conventional sin 2 ψ method using Cr-Kα radiation.

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Evaluation of Residual Stress Distribution in Shot-Peened Steel by Synchrotron Radiation

Abstract: The in-depth distribution of residual stresses in shot-peened steels was measured by using high energy X-rays posed to estimate the stress value of the distributed residual stress. The new method was a combination of the sidethe distribution obtained by the surface removal method.

Cited by 29 publications

References 0 publications

Effect of residual stresses on fatigue strength of severely surface deformed steels by shot peening

Effect of residual stresses on fatigue strength of severely surface deformed steels by shot peening

Mitigation Technologies for Damage Induced by Pressure Waves in High-Power Mercury Spallation Neutron Sources (I)—Material Surface Improvement—

High Space-Resolutive Evaluation of Subsurface Stress Distribution by Strain Scanning Method with Analyzer Using High-Energy Synchrotron X-Rays

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