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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.56  No.10 (2007)  >  pp.985-992

Journal of the Society of Materials Science, Japan
<<Previous article Vol.56  No.10 (2007)   pp.985 - 992 Next article>>

Measurement of Internal Strain in Materials Using High Energy Synchrotron Radiation White X-Rays

Jun-ichi SHIBANO1), Takahisa SHOBU2), Kenji SUZUKI3), Tomoyuki HIRATA4), Hiroshi KANEKO2) and Michiaki KOBAYASHI1)
1) Dept. of Mech. Eng., Kitami Inst. of Tech.
2) Synchrotron Radiation Res. Unit., Japan Atomic Energy Agency
3) Dept. of Tech. and Living Sci., Niigata Univ.
4) Dept. of Mech. Eng., Kitami Inst. of Tech.

This paper presents a basic research on a measurement of strain in the bulk of materials by using high energy white X-rays from a synchrotron radiation source of SPring-8. WEL-TEN780E (JIS G3128 SHY685) whose grain size was 13μm was used as a specimen shaped into G type. The specimen was loaded with bending. The white X-ray beam, which has a height of 50μm and width of 300μm, was incident in the specimen with the Bragg angle θ of 5degree. Bending strain at the surface of specimen was measured by a strain gauge. The strain in the loading direction of the specimen was obtained directly from a rate of change of peak energy of transmitted X-rays through the thickness. As a result, the internal strain of SHY685 of 5mm thickness could be evaluated using white X-rays which range of energy from 60keV to 150keV. It is suitable for the measurement with sufficient accuracy to include more than or equal to 5000 grains of crystal in the gauge volume. The measurement error of strain could be decreased by using the diffracted X-rays with high energy. Furthermore, the measurement with a high degree of accuracy was accomplished using α–Fe321 diffraction in this material. The results showed that the high energy white X-ray is effective for internal strain measurements.

Strain measurement, High energy synchrotron radiation X-rays, Internal strain, Energy dispersive method

Received: January 25, 2007
Published online: October 18, 2007
Copyright (c) 2007 by The Society of Materials Science, Japan



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