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...
英字タイトル:
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...
英字タイトル:
Study on Evaluation of Internal Stresses using Area Detector

In order to assure the reliability of advanced gas turbine systems, it is very important to evaluate the damage of high temperature materials such as Ni-ba sed superalloys under creep and fatigue conditions quantitatively. The refractive index of the gamma-prime phase was found to be smaller than that of the g amma phase in the Ni-based superalloy, when the wavelength of an irradiated laser beam is shorter than 500 nm. Therefore, it is possible to evaluate the cr eep damage of this material quantitatively ...
英字タイトル:
Basic Study of Non-destructive Evaluation of Creep or Fatigue Damage of Ni-based Superalloy

Long-term radiation exposure can cause damage of concrete structures due to the volume expansion of the aggregate minerals. In this study, granite, sandstone, and tuff were irradiated with 2.8 MeV Fe2+ at room temperature to different level of ion fluences. Step height measurement was conducted to quantify the volume change. It was found that the swelling of all minerals saturated at around 300 nm. Tuff, which contains almost all silica, exhibited the fastest swelling, among others. ...

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...
英字タイトル:
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...
英字タイトル:
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...
英字タイトル:
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...
英字タイトル:
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...
英字タイトル:
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 ...
英字タイトル:
微視的残留力 Residual Microstress in Austenitic Stainless Steel due to High Strain Rate