An area detector technique has to be applied to the strain scanning method for materials with coarse grains. A new rotating slit system was designed for a 2-dimensional (2D) detector strain scanning method. The rotating slit system can focus the 2D detector on the center of the goniometer, and the gauge volume is made by the rotating slit system. The stress measurements were examined with the rotating slit and 2D detector. The measured diffraction spots shifted for the 2D strain scanning. The magnitu...
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Evaluation of Internal Stresses using Area Detectors

An area detector technique has to be applied to the strain scanning method for the coarse grains. A new rotating slit system was designed for a 2-dimensional (2D) detector strain scanning method. The rotating slit system focuses the 2D detector on the center of the goniometer, an d the gauge volume is made by the rotating slit system. The stress measurements were examined by the rotating slit and 2D detector. The measured diffraction spots shifted for the 2D strain scanning. The magnitude of the shift of t...
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Study on Evaluation of Internal Stresses using Area Detector

In this study, we proposed a double exposure method using synchrotron white X-rays (DEM-WX) to measure strains of coarse-grained materials, and examined its feasibility. The X-ray diffractions were measured by a CdTe pixel detector. The CdTe pixel detector can resolve photon energy by changing a threshold voltage. Calibrating each pixel of the detector using characteristic X-rays of Pb and W foils, the images by threshold X-ray energy were obtained. The difference image, which is like a diffraction image wi...
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Feasibility Study on Stress Measurements using CdTe Pixel Detector and Synchrotron White X-Rays

Suppressing the stress corrosion cracking by reducing carbon contents in austenitic stainless steels seems to be not effective on core shrouds used in boiling water reactor in Japan. Trans-granul ar cracking was found out in the shrouds. To clarify a mechanism of the cracking, stress measurement on specimens under stretched condition in hot water has been attempted in the present study. A n in-situ device for diffraction measurements in synchrotron radiation facility has been developed by the present autho...
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Effect of Surface Grinding on Residual Stress in Low Carbon Austenitic Stainless Steel SUS316L

Austenitic stainless steel (SUS316L) was used as material of the specimen, The specimens were given tensile plastic deformation, the range of plastic strains was from 0% to 55%. The Vickers hardness and FWHM of the specimens corresponded to t he plastic strain, The residual macro-stress was measured by MnKa radiations. The residual macro-stress of the annealed specimen had a small compression and changed into a tension after tensile plastic deformation. The specimen with 1% plasti c strain showed the maxim...
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Elastic Anisotropy and Residual Microstress of AusteniticStainless Steel

Austenitic stainless steel (SUS316L) was used as material of the specimen. Tensile deformation was applied to the plate specimen, the range of plastic strains was from 0% to 55%. The Vickers hardness of the specimens corresponded to the plastic strain. The residual macrostress was measured by Mn-Kα radiations. The residual macrostress of the annealed specimen had a small compression and changed into a tension after tensile plastic deformation. The specimen with 1% plastic strain showed the maximum ten...
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Residual Microstress of Austenitic Stainless Steel by Plastic Deformation

Austenitic stainless steel (SUS316L) was used as specimen material, and the plate specimens were deformed plastically with a wide range of strain rates (6.67×10-5~ 6.70×102 /s). The residual micro-stress for each lattice plane was measured with hard synchrotron X-rays. The residual macro-stress due to tensile deformation de- pended on strain rate. The residual micro-stresses varied from tension to compression, depending on the dif- fraction elastic constant. The soft lattice plane had tensile residual...
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Residual micro-stresses in austenitic stainless steel due to high strain rate

Austenitic stainless steel (SUS316L) was used as the specimen material. The specimens were deformed plastically with a wide range (6.7 x 10-5 ~ 670 s-1). The residual micro-stresses were measured using hard synchrotron X-ray. The residual micro-stress for each lattic e plane was arranged with Young's modulus, which was calculated by Kroner model. In the high strain rate, the change of the residual m icro-stress became small. The residual micro-stresses peened with laser and water-jet were examined as well ...
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微視的残留力 Residual Microstress in Austenitic Stainless Steel due to High Strain Rate

As a new X-ray stress measurement method for coarse grain material, the double exposure method (DEM) is proposed, and its analysis is explained in this paper. A diffraction angle can be obtained from an incident and a spotty diffracted beams. Each X-ray beam is measured by an area detector on a linear motion stage on the 2 θ-arm in the DEM. To examine the validity of the DEM, the residual stress of the plastically bent specimen was measured. In addition, the residual stress distribution of the indentation s...
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Stress Measurement of Coarse Grains Using Double Exposure Method

A diffraction spot trace method (DSTM) was developed to measure internal stresses of materials with coarse grains. The DSTM was applied to light metals, such as aluminum alloy and magnesium alloy. In this study, validity of the DSTM was examined using high energy synchrotron X-rays of 70 keV. The specimen was a welded plate of austenitic stainless steel (SUS316L). The thickness of the specimen was 9 mm. The improved rotating slit-system was used, and PILATUS was used as an area detector. It was diffi...
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Evaluation of Welding Residual Stresses in Austenitic Stainless Steel Using Diffraction Spot Trace Method