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

The material of the specimen was austenitic stainless steel, SUS316L. The residual stresses in the specimen was introduced by a water j et peening (WJP). The change in the residual stress with thermal aging at 773K was measured by an X-ray stress measurement. The WJP res idual stresses were an equi-biaxial stress state, and the compressive residual stress did not decrease against the thermal aging. To i nvestigate dependence of the residual stress on a lattice plane, the WJP residual stresses were measured...
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Characteristics of Residual Stresses of Water Jet Peened Stainless Steel

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

The plate specimen of austenitic stainless steel was prepared, and a plastic strain of 2.8% was applied to the specimen under uniaxial tension. The residual stresses of the specimen were measured by cos2 χ method using 2 2 0, 4 0 0, 3 3 1, and 6 2 0 lattice planes. For lattice planes with a lower atomic density, the 2θ-cos2 χ diagram showed an upward warp. For lattice planes with a higher atomic density, the 2θ-cos2 χ diagram showed a downward warp. This phenomenon was caused by intergranular strains. T...
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Intergranular Stresses of Austenitic Stainless Steel due to 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

Stainless steel is used in various nuclear installations as a major structural material. Tritium is produced by several nuclear reactions in these facilities. It is considered that the hydrogen isotope included tritium permeated for stainless steel through the interaction such as dissolution, diffusion and recombination, and is released on the atmosphere. Therefore, it is important to clarify permeation behavior of tritium in stainless steel from the viewpoint for improvement of the social acceptability o...
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Study on permeation behavior of hydrogen isotope in stainless steel

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