Evaluation of Subsurface Distribution of Residual Stress in Austenitic Stainless Steel Using Strain Scanning Method

Abstract:

The strain scanning method was applied to the evaluation of the subsurface distribution of the residual stress beneath the shot-peened surface of an austenitic stainless steel SUS304L which had coarse grains and preferred orientation. The experiment was performed at beam line BL22XU at SPring-8 using monochromatic X-rays of 70.14 keV and a Ge (111) analyzer. The sizes of both incident and receiving slits were 2 × 0.2 mm2. The specimens were annealed or shot-peened and had the dimensions of 20 × 20 × 5 mm3. The grain size was about 37 μm. In order to obtain the diffractions from an enough number of grains, various types of oscillation methods, which were translation, rotation and tilting of the specimen, were examined. The translational oscillation was found to be enough to obtain the accurate strain distribution. By combining the translational oscillation method with the correction to the surface aberration, the subsurface distribution of the residual stress of shot-peened austenitic stainless steel was successfully determined.

• Periodical: Materials Science Forum (Volumes 524-525)
• Pages: 691-696
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.524-525.691
• Online since: September 2006
• Authors: Takahisa Shobu, Hiroyuki Konishi, Jun'ichiro Mizuki, Kenji Suzuki, Hiroshi Suzuki, Yoshiaki Akiniwa, Keisuke Tanaka
• Keywords: Austenitic Stainless Steel, Residual Stress Measurement, Strain Scanning Method, Synchrotron Radiation (XRD)

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