X-ray-diffraction approach for studies on fatigue and creep

Taira, Shuji

doi:10.1007/bf02322729

Cited by 17 publications

(5 citation statements)

References 17 publications

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“…When diffraction condition is fulfilled for a grain, its orientation spread is observed during sample rotation, so that grain orientation spread could be equivalent to half-value width of rocking curve, which was known to be related to the amount of the plastic strain [9,10]. In monotonic tension test, grain orientation spread increases with increasing of applied stress in plastic region.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Fatigue Damage by Diffraction Contrast Tomography Using Synchrotron Radiation

Shiozawa

Nakai

Miura

et al. 2014

AMR

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The three dimensional grain mapping technique for polycrystalline material, which is called X-ray diffraction contrast tomography (DCT) has proposed. In the present study, the measurement of DCT was conducted in SPring-8, which is the brightest synchrotron radiation facility in Japan, and the condition of measurement and data procedure are discussed. Developed technique was applied to aluminium alloy and stainless steel. The shape and location of grain could be determined by the developed three-dimensional mapping technique using the apparatus in a bending beam line of SPring-8. To evaluate plastic deformation, the grain orientation spreads of individual grains were measured. The grain orientation spread is caused by the mosaicity, which relates to the dislocation structure in a grain. The grain orientation spread was found to increase with increasing plastic strain. Fatigue damage also could be evaluated by the grain orientation spread in the DCT measurement.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Fatigue Damage by Diffraction Contrast Tomography Using Synchrotron Radiation

Shiozawa

Nakai

Miura

et al. 2014

AMR

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“…As expected, many dislocations were introduced by quenching and/or machining. These dislocations can be moved to the grain boundaries and disappear using high frequency vibrations induced by cavitation impacts, as the cyclic loading or ultrasonic vibration move dislocations [130][131][132]. In the case of conventional shot peening, dislocations increased due to solid collision.…”

Section: Comparison Between Cavitation Peening and Other Peening Methodsmentioning

confidence: 99%

Cavitation Peening: A Review

Soyama

2020

Metals

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The most popular surface modification technology used to enhance the mechanical properties of metallic materials is shot peening. Shot peening improves fatigue life and strength by introducing local plastic deformation pits. However, the pits increase surface roughness, which is a disadvantage for fatigue properties. Recently, cavitation peening, in which cavitation bubble collapse impacts are used, has been developed as an advanced surface modification technology. The advantage of cavitation peening is the lesser increase in surface roughness compared with shot peening, as no solid collisions occur in cavitation peening. In conventional cavitation peening, cavitation is generated by injecting a high-speed water jet into water. However, cavitation peening is different from water jet peening, in which water column impacts are used. In the present review, to avoid confusing cavitation peening and water jet peening, fundamentals and mechanisms of cavitation peening are described in comparison to water jet peening, and the effects and applications of cavitation peening are reviewed compared with the other peening methods.

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“…4. Through Rodrigues' rotation formula, the unit vector of slip directions, n 4 and n 5 are given by the rotation of the intersection unit vector, n 3 , around n 1 as ( )…”

Section: Thermec 2016mentioning

confidence: 99%

“…X-ray diffraction for polycrystalline materials has been used to analyze microstructural changes related to the deformation of metallic materials. Taira et al [3,4] and Nakai et al [5] irradiated microbeam X-rays in the polycrystalline metal surface and analyzed the dislocation structure of the crystal grain from the diffraction pattern. They estimated excessive dislocation density, microscopic lattice strain by the measurement of the extent of the diffraction spot.…”

Section: Introductionmentioning

confidence: 99%

Misorientation Measurement of Individual Grains in Fatigue of Polycrystalline Alloys by Diffraction Contrast Tomography Using Ultrabright Synchrotron Radiation

Nakai

Shiozawa

Nakao

et al. 2016

MSF

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A three dimensional grain mapping technique for polycrystalline materials, called X-ray diffraction contrast tomography (DCT), was developed at SPring-8, which is the brightest synchrotron radiation facility in Japan. The developed technique was applied to a commercially pure iron and austenitic stainless steel. The shape and location of grains could be determined by DCT using the apparatus in a beam line of SPring-8. To evaluate the dislocation structure in fatigue, the total misorientation of individual grains was measured by DCT. The average value of the total misorientation over one sample was increased with the number of cycles. In a grain, the change of the total misorientation was largest for primary slip plane. For austenitic stainless steel (fcc), the change of the total misorientation in fatigue was larger for planes with larger Schmid factor, while it was not depended on the Schmid factor for commercially pure iron (bcc). This different behavior must come from planer slip in fcc structure and wavy slip in bcc structure.

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X-ray-diffraction approach for studies on fatigue and creep

Cited by 17 publications

References 17 publications

Evaluation of Fatigue Damage by Diffraction Contrast Tomography Using Synchrotron Radiation

Evaluation of Fatigue Damage by Diffraction Contrast Tomography Using Synchrotron Radiation

Cavitation Peening: A Review

Misorientation Measurement of Individual Grains in Fatigue of Polycrystalline Alloys by Diffraction Contrast Tomography Using Ultrabright Synchrotron Radiation

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