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

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

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

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 difficu...
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Evaluation of Welding Residual Stresses in Austenitic Stainless Steel Using Diffraction Spot Trace Method

Deformation and recrystallization mechanisms are worthy of a note as the controls in properties of metallic materials. In this study, deformation and recrystallization of aluminum single crystal were in-situ observed using synchrotron X-rays, and the recrystallization behavior was obtained. The specimen was deformed with plastic strain of 8 %, and was heated at 753 K. after 6 minutes from heating, the diffraction from subgrains were appeared in the diffraction pattern of the initial crystal. The subgrains c...
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In-situ Observation during Deformation and Recrystallization of Aluminum Single Crystal using Synchrotron Radiation

The spiral slit-system and DSTM (diffraction spot trace method) are under development in order to evaluate internal stresses of materials with coarse grains. The spiral slit-system was improved so that the length of the gauge volume is independent of the diffraction angle. The bending stress in the specimen with coarse grains was measured in order to confirm performance of this advanced spiral slit-system. The distribution of the measured bending stress coincided with the applied bending stress. As a r...
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Evaluation of Residual Stresses inWelded Part using Hard Synchrotron X-Rays

大型放射光施設 SPring-8では、現在 57本のビームラインが稼働しているが、そのビームラインの多くが単色 X線を利用している。しかし、本来の放射光は様々な波長を含んでおり、分光器を介さないこれらの光は白色 X線と呼ばれている。白色 X線を利用した応力測定は、古くは 1970年代から登場［1］しており、当時は比較的低エネルギの白色 X線が利用されてきた。 1990年代に入り、SPring-8に代表される第 3世代の大型放射光施設の台頭によって次第に高エネルギ白色 X線の利用が容易となり、主に欧米を中心に研究が進められてきた。 白色 X線を利用した応力測定は、半導体検出器（Solid State Detector: SSD）を利用したエネルギ分散法が一般的である。しかし、ここ数年、白色 X線による応力測定は検出器の開発とともに大きな変革期を迎えている。 本稿では従来のエネルギ分散法による応力測定法の紹介の他に、新たな検出器による白色 X線を利用した応力測定法について述べる。...

In this study, stress measurements were performed using a double exposure method with hard synchrotron monochromatic X-rays, and its validity was proved. The diffractions of the shrink-?tted ring of austenitic stainless steel SUS304 were measured by the CdTe pixel detector. The used X-rays were 70, 80 and 90 keV. The measured stress distributions with the 311 diffraction of γ-Fe corresponded to the predicted result. In addition, The stress distribution of the shrink-?tted ring was measured by the CCD camera...
英字タイトル:
Stress Measurements of Austenitic Stainless Steel using Hard Synchrotron X-Rays